A command-line program to crop the margins of PDF files, with many options.

## pdfCropMargins

The pdfCropMargins program is a command-line application to automatically crop the margins of PDF files. Cropping the margins can make it easier to read the pages of a PDF document – whether the document is printed or displayed on a screen – because the display fonts are larger. This program is similar to the Perl script pdfcrop except with many more options.

## Features

• Automatically detects the margins and can crop a given percentage of them.

• Can crop all the pages to the same size to give a uniform appearance (such as in two-up).

• Works on Linux, Windows, Cygwin, and OS X/Darwin.

• Has an optional graphical user interface (GUI) for interactive cropping.

• Works with either the pdftoppm program or with Ghostscript.

• A version of pdftoppm for Windows is included.

• Renders and analyzes page images to find the bounding boxes, which allows it to deal with noisy scanned PDFs.

• Ghostscript can optionally be used to find the bounding boxes directly.

• Can automatically apply a Ghostscript repair operation to attempt to fix corrupt PDF files.

• Crops rotated pages according to their appearance in the document viewer.

• Can crop pages uniformly based on the nth smallest crop values, which helps with noisy images or documents where a few pages have unwanted markings in their margins.

• Can uniformly crop even and odd pages separately.

• Can automatically run a document previewer on the output file.

• The format of automatically-generated output-file names is easily modifiable.

• Implements a rudimentary ‘undo’ capability by default.

• Can deal with at least simple cases of password-encrypted files.

• Works with Python 2 and Python 3.

This GIF shows the optional GUI, before and after cropping a document:

See the CHANGELOG for recent changes and new features.

## Requirements

This program depends on either the Ghostscript program or the pdftoppm program being installed (and locatable) on the system. For Window users a version of a pdftoppm binary (xpdf 4.01.01) is packaged with the program and will be used as a fallback if no other program can be found.

• pdftoppm

The pdftoppm program is standard in most Linux distributions and is easy to install in Cygwin. It is currently part of the Poppler PDF tools, so that package should be installed on Linux and Cygwin.

In Windows pdftoppm is not as easy to install, but a collection of PDF tools found here includes pdftoppm. That version is bundled with the software and will be used as a fallback on Windows if neither Ghostscript nor the system pdftoppm program can be found.

• Ghostscript

Ghostscript is in the repos of most Linux distributions and is easy to install on Windows and in Cygwin.

The Windows install page is located here; the non-commercial GPL version on that page should work fine for most people. Add the directory of the executable gswin64c.exe (or the 32 bit version if you installed that) to your Windows system path so it is discoverable (and runnable from the command shell). On Window 10 the place to go is:

Start -> Control Panel -> System and security -> System -> Advanced system settings

Now click “Environment Variables” and then double click on the user variable Path. Click “New” and browse to the directory to add, something like C:\Program Files\gs\gs9.27\bin. Restart your command shell for the change to be recognized.

## Installing

The easiest way to install the pdfCropMargins program is by using pip.

### Ubuntu/Mint

Be sure \$HOME/.local/bin is in your system PATH if you are installing via pip with the --user option. (To install system-wide without --user the pip3 command below would also need to be run with sudo.)

Here is the plain install, without a GUI:

sudo apt install python3-pip ghostscript poppler-utils
pip3 install pdfCropMargins --user --upgrade

This is the install with the GUI:

sudo apt install python3-pip ghostscript poppler-utils python3-setuptools python3-tk
pip3 install pdfCropMargins[gui] --user --upgrade

If you get an error “Failed building wheel for pymupdf” with the GUI install you can try forcing a binary install of pyMuPDF:

pip3 install pdfCropMargins[gui] --user --upgrade --only-binary pymupdf

### Windows

As noted above Ghostscript or pdftoppm should be installed or the program will fall back to a copy of pdftoppm that is bundled with it.

The pip program should be automatically installed along with Python. If you cannot find the pip executable you can usually run it like this:

python -m pip <arguments-to-pip>

Note that on some Windows installs the executable for Python is py rather than python.

To install without the GUI use:

pip install pdfCropMargins --upgrade

To install with the GUI use:

pip install pdfCropMargins[gui] --upgrade

In order for the command pdf-crop-margins to be found, the bin directory it is created in by the pip command must be on the Windows Path. The system-wide Python bin directory should already be there if you checked the box to modify Path when you installed Python; otherwise it should be added. (If you install with the --user option to pip then you need to be sure that the local Python bin directory is in the Windows Path.)

### Running from the source distribution

The pdfCropMargins program can also be run directly from its source code directory tree, provided the dependencies are installed. In that case the PyPDF2 package must also be installed and available in the Python distribution that will be used to run pdfCropMargins. If Ghostscript is unavailable as a system command then the Pillow imaging package is also necessary in the Python distribution. Pillow is also needed for certain advanced features which use explicit image analysis, so it is a good idea to install it in Python. Assuming the dependencies are satisfied, run the program as bin/pdfCropMargins.py, where the path is relative to the top of the source distribution. The GUI also has dependencies which can be seen in the setup.py file.

## Running

After installation via pip the program can be run with a command such as:

pdf-crop-margins -v -s -u your-file.pdf

That command prints verbose output, forces all pages to be the same size (-s) and then crops each page the same amount (-u) for a uniform appearance, retaining the default of 10% of the margins.

For help, run:

pdf-crop-margins -h | more

On Windows you may need to explicitly put the Python distribution’s Scripts directory into your environment PATH in order to avoid having to use the full pathname.

To diagnose unexpected crops, try running with the -v verbose argument. It will tell you the page with the smallest crop amount for a margin. Running without the -u or -s options will crop each page separately, so you can see which pages might be causing problems (such as pages with noise near the borders or margin text). To get cropped pages all the same size be sure to use both -s to make pages the same size and -u to crop each page by the same amount. Sometimes a small pre-crop is needed (-ap or -ap4) to get past small, unwanted markings near the edges of pages.

## Documentation

To see the documentation, run:

pdf-crop-margins -h | more

The output of that command follows:

Usage: pdf-crop-margins [-h] [-o OUTFILE_NAME] [-v] [-gui] [-p PCT]
[-p4 PCT PCT PCT PCT] [-a BP] [-a4 BP BP BP BP]
[-ap BP] [-ap4 BP BP BP BP] [-u] [-m INT]
[-m4 INT INT INT INT] [-mp INT] [-s] [-ms INT] [-e]
[-g PAGESTR] [-t BYTEVAL] [-nb INT] [-ns INT] [-gs]
[-gsr] [-x DPI] [-y DPI] [-b [m|c|t|a|b]]
[-f [m|c|t|a|b]] [-r] [-A] [-gsf] [-nc] [-pv PROG]
[-mo] [-q] [-nco] [-pf] [-sc STR] [-su STR] [-ss STR]
[-pw PASSWD] [-spr FLOAT:FLOAT]
[-prw FLOAT FLOAT FLOAT FLOAT] [-dcb STR] [-dcw STR]
[-i] [-pdl] [-gsp PATH] [-ppp PATH]
PDF_FILE [PDF_FILE ...]

Description:

A command-line application to crop the margins of PDF files. Cropping
the margins can make it easier to read the pages of a PDF document --
whether the document is printed or displayed on a screen -- because the
display fonts are larger. Margin-cropping is also sometimes useful when
a PDF file is included in a document as a graphic.

By default 10% of the existing margins will be retained; the rest will
be eliminated. There are many options which can be set, however,
including the percentage of existing margins to retain.

Here is a simple example of cropping a file named document.pdf and
writing the cropped output-document to a file named
croppedDocument.pdf:

pdf-crop-margins document.pdf -o croppedDocument.pdf

If no destination is provided a filename will be automatically
generated from the name of the source file (see below).

The pdfCropMargins program works by changing the page sizes which are
stored in the PDF file (and are interpreted by programs like Acrobat
Reader). Both the CropBox and the MediaBox are set to the newly-
computed cropped size. After this the view of the document in most
programs will be the new, cropped view.

When cropping a file not produced by the pdfCropMargins program the
default is also to save the intersection of the MediaBox and any
existing CropBox in the ArtBox. This saves the "usual" view of the
original document in programs like Acrobat Reader. Subsequent crops of
a file produced by pdfCropMargins do not by default alter the ArtBox.
This allows for an approximate "restore to original margin-sizes"
option ('--restore') which simply copies the saved values back to the
MarginBox and CropBox. Note, though, that this assumes the ArtBox is
unused (it is rarely used, and this feature can be turned off with the
-A option).

These defaults are designed to reduce the number of copies of a
document which need to be saved. This is especially useful if
annotations, highlighting, etc., are added to the document. If a
document is cropped twice with this program it still stores the
original margin settings. At least an approximate version of the
original document's margin-formatting can be recovered by using the '--
restore' option. Programs which change the "Producer" string in the PDF
may interfere with this feature.

Below are several examples using more of the command-line options, each
applied to an input file called doc.pdf. The output filename is
unspecified in these examples, so the program will automatically
generate the filename (or an output filename can always be explicitly
provided):

Crop doc.pdf so that all the pages are set to the same size and the
cropping amount is uniform across all the pages (this gives a nice two-up
appearance).  The default of retaining 10% of the existing margins is
used.  Note carefully that '-u' only makes the amount to be cropped uniform
for each page; if the pages do not have the same size to begin with they
will not have the same size afterward unless the '-s' option is also used.

pdf-crop-margins -u -s doc.pdf

Crop each page of doc.pdf individually (i.e., not uniformly), keeping 50%
of the existing margins.

pdf-crop-margins -p 50 doc.pdf

Crop doc.pdf uniformly, keeping 50% of the left margin, 20% of the bottom
margin, 40% of the right margin, and 10% of the top margin.

pdf-crop-margins -u -p4 50 20 40 10 doc.pdf

Crop doc.pdf retaining 20% of the margins, and then reduce the right page
margins only by an absolute 12 points.

pdf-crop-margins -p 20 -a4 0 0 12 0 doc.pdf

Pre-crop the document by 5 points on each side before computing the
bounding boxes.  Then crop retaining 50% of the computed margins.  This
can be useful for difficult documents such as scanned books with page-edge
noise or other "features" inside the current margins.

pdf-crop-margins -ap 5 -p 50 doc.pdf

Crop doc.pdf, re-naming the cropped output file doc.pdf and backing
up the original file in a file named backup_doc.pdf.

pdf-crop-margins -mo -pf -su "backup" doc.pdf

Crop the margins of doc.pdf to 120% of their original size, increasing the
margins.  Use Ghostscript to find the bounding boxes (in general this is
often faster if Ghostscript is available and no rendering operations are
needed).

pdf-crop-margins -p 120 -gs doc.pdf

Crop the margins of doc.pdf ignoring the 10 largest margins on each edge
(over the whole document).  This is especially good for noisy documents
where all the pages have very similar margins, or when you want to ignore
marginal annotations which only occur on a few pages.

pdf-crop-margins -m 10 doc.pdf

Crop doc.pdf, launch the acroread viewer on the cropped output, and then
query as to whether or not to rename the cropped file doc.pdf and back up
the original file as doc_uncropped.pdf.

pdf-crop-margins -mo -q doc.pdf

Crop pages 1-100 of doc.pdf, cropping all even pages uniformly and all odd
pages uniformly.

pdf-crop-margins -g 1-100 -e doc.pdf

Try to restore doc.pdf to its original margins, assuming it was cropped
with pdfCropMargins previously.  Note that the default output filename is
still named doc_cropped.pdf, even though it is the recovered file.

pdf-crop-margins -r doc.pdf

There are many different ways to use this program. After finding a
method which works well for a particular task or workflow pattern it is
often convenient to make a simple shell script (batch file) which
invokes the program with those particular options and settings. Simple
template scripts for Bash and Windows are packaged with the program, in
the bin directory.

When printing a document with closely-cropped pages it may be necessary
to use options such as "Fit to Printable Area". It may also be
necessary to fine-tune the size of the retained margins if the edges of
the text are being cut off.

Sometimes a PDF file is corrupted or non-standard to the point where
the routines used by this program raise an error and exit. In that case
it can sometimes help to repair the PDF file before attempting to crop
it. If it is readable by Ghostscript then the following command will
often repair it sufficiently:

gs -o repaired.pdf -sDEVICE=pdfwrite -dPDFSETTINGS=/prepress corrupted.pdf

This command can also be used to convert some PostScript (.ps) files to
PDF. In Windows the executable would be something like "gswin32c.exe"
rather than "gs". The option '--gsFix' (or '-gsf') will automatically
attempt to apply this fix, provided Ghostscript is available. See the

The pdfCropMargins program handles rotated pages (such as pages in
landscape mode versus portrait mode) as follows. All rotated pages are
un-rotated as soon as they are read in. All the cropping is then
calculated. Finally, as the crops are applied to the pages, the
rotation is re-applied. This may give unexpected results in documents
which mix pages at different rotations, especially with the '--uniform'
or '--samePageSize' options. The arguments of all the options which
take four arguments, one for each margin, are shifted so the left,
bottom, right, and top margins correspond to the screen appearance
(regardless of any internal rotation).

All the command-line options to pdfCropMargins are described below. The
following definition is useful in precisely defining what several of
the options do. Let the delta values be the absolute reduction lengths,
in points, which are applied to each original page to get the final
cropped page. There is a delta value for each margin, on each page. In
the usual case where all the margin sizes decrease, all the deltas are
positive. A delta value can, however, be negative (when percentRetain >
100 or when a negative absolute offset is used). When a delta value is
negative the corresponding margin size will increase.

Positional arguments:

PDF_FILE              The pathname of the PDF file to crop. Use quotes
around any file or directory name which contains a
space. If no filename is given for the cropped PDF
output file via the '-o' flag then a default output
filename will be generated. By default it is the same
as the source filename except that the suffix ".pdf"
is replaced by "_cropped.pdf", overwriting by default
if the file already exists. The file will be written
to the working directory at the time when the program
was run. If the input file has no extension or has an
extension other than '.pdf' or '.PDF' then the suffix
'.pdf' will be appended to the existing (possibly-
null) extension. Globbing of wildcards is performed on
Windows systems.

Optional arguments:

-h, --help            Show this help message and exit.

-o OUTFILE_NAME, --outfile OUTFILE_NAME
An optional argument specifying the pathname of a file
that the cropped output document should be written to.
By default any existing file with the same name will
be silently overwritten. If this option is not given
the program will generate an output filename from the
input filename. (By default "_cropped" is appended to
the input filename before the file extension. If the
extension is not '.pdf' or '.PDF' then '.pdf' is
appended to the extension). Globbing of wildcards is
performed on Windows systems.

progress. Without this switch only warning and error
messages are printed to the screen.

-gui, --gui           Run the graphical user interface. This mode allows you
to interactively preview and test different cropping
options without having to recalculate the bounding
boxes each time (which can be slow). All the usual
command-line options to the program are still
respected.

-p PCT, --percentRetain PCT
Set the percent of margin space to retain in the
image. This is a percentage of the original margin
space. By default the percent value is set to 10.
Setting the percentage to 0 gives a tight bounding
box. Percent values greater than 100 increase the
margin sizes from their original sizes, and negative
values decrease the margins even more than a tight
bounding box.

-p4 PCT PCT PCT PCT, -pppp PCT PCT PCT PCT, --percentRetain4 PCT PCT PCT PCT
Set the percent of margin space to retain in the
image, individually for the left, bottom, right, and
top margins, respectively. The four arguments should
be percent values.

-a BP, --absoluteOffset BP
Decrease each margin size by an absolute floating
point offset value, to be subtracted from each
margin's size after the 'percentRetain' option is
applied. The units are big points, bp, which is the
unit used in PDF files. There are 72 bp in an inch. A
single bp is approximately equal to a TeX point, pt
(with 72.27pt in an inch). Negative values are
allowed; positive numbers always decrease the margin
size and negative numbers always increase it. Absolute
offsets are always applied after any percentage change
operations.

-a4 BP BP BP BP, -aaaa BP BP BP BP, --absoluteOffset4 BP BP BP BP
Decrease the margin sizes individually with four
absolute offset values. The four floating point
arguments should be the left, bottom, right, and top
offset values, respectively. See the '--
absoluteOffset' option for information on the
units.

-ap BP, --absolutePreCrop BP
This option is like '--absoluteOffset' except that it
is applied before any bounding box calculations (or
any other operations). The argument is the same, in
units of bp. All successive operations are then
relative to this pre-crop box, considered to be the
full-page box. Note that since this absolute crop is
applied before any bounding boxes are computed it is
relative to the original full-page boxes of the
document (unlike 'absoluteOffset', which is a crop
relative to the newly-cropped margin after
'percentRetain' is applied). As a consequence, the
number of points may need to be larger than what would
work for 'absoluteOffset'. This option can be used to
ignore text and markings out at the edge of the
margins by cropping it out before the bounding boxes
are calculated.

-ap4 BP BP BP BP, --absolutePreCrop4 BP BP BP BP
This is the same as '--absolutePreCrop' except that
four separate arguments can be given. The four
floating point arguments should be the left, bottom,
right, and top absolute pre-crop values,
respectively.

-u, --uniform         Crop all the pages uniformly. This forces the
magnitude of margin-cropping (absolute, not relative)
to be the same on each page. This option is applied
after all the delta values have been calculated for
each page, individually. Then all the left-margin
delta values, for each page, are set to the smallest
left-margin delta value over every page. The bottom,
right, and top margins are processed similarly. Note
that this effectively adds some margin space (relative
to the margins obtained by cropping pages
individually) to some of the pages. If the pages of
the original document are all the same size then the
cropped pages will again all be the same size. The '--
samePageSize' option can be used in combination with
this option to force all pages to be the same size
after cropping.

-m INT, --uniformOrderStat INT
Choosing this option implies the '--uniform' option,
but the smallest delta value over all the pages is no
longer chosen. Instead, for each margin the nth
smallest delta value (with n numbered starting at
zero) is chosen over all the pages. The argument is
the integer n, for example '-m 4'. Choosing n to be
half the number of pages gives the median delta value.
This option is useful for cropping noisy scanned PDFs
which have a common margin size on most of the pages,
or for ignoring annotations which only appear in the
margins of a few pages. This option essentially causes
the program to ignores the n largest tight-crop
margins when computing common delta values over all
the pages. Increasing n always either increases the
cropping amount or leaves it unchanged. Some trial-
and-error may be needed to choose the best number.
Using '-m 1' tends to work well with arXiv papers
(which have a date in the margin of the first
page).

-m4 INT INT INT INT, -mmmm INT INT INT INT, --uniformOrderStat4 INT INT INT INT
This option is the same as '--uniformOrderStat' (or
'-m') except that separate values are specified for
each margin individually. The margins are ordered as
left, bottom, right, and top.

-mp INT, --uniformOrderPercent INT
This option is the same as '--uniformOrderStat' except
that the order number n is automatically set to a
given percentage of the number of pages which are set
to be cropped (either the full number or the ones set
with '--pages'). This option overrides '--
uniformOrderStat' if both are set. The argument is a
float percent value; rounding is done to get the final
order-number. Setting the percent to 0 is equivalent
to n=1, setting the percent to 100 is equivalent to
setting n to the full number of pages, and setting the
percent to 50 gives the median (for odd numbers of
pages).

-s, --samePageSize    Set all the page sizes to be equal. This option only
has an effect when the page sizes are different. The
pages sizes are set to the size of the union of all
the page regions, i.e., to the smallest bounding box
which contains all the pages. This operation is always
done before any others (except '--absolutePreCrop').
The cropping is then done as usual, but note that any
margin percentages (such as for '--percentRetain') are
now relative to this new, possibly larger, page size.
The resulting pages are still cropped independently by
default, and will not necessarily all have the same
size unless '--uniform' is also selected to force the
cropping amounts to be the same for each page. If
pages are selected with '--pages' then this option is
only applied to those selected pages.

-ms INT, --samePageSizeOrderStat INT
Choosing this option implies the '--samePageSize'
option, but the calculations for each edge of the
smallest bounding box ignore the largest (or smallest
for left and bottom edges) n values. The argument is
the nonnegative number n. Each edge is calculated
independently. This is an order statistic for
selecting the uniform size to make the pages. Note
that this will cut off parts of some pages if n>0.

-e, --evenodd         Crop all the odd pages uniformly, and all the even
pages uniformly. The largest amount of cropping that
works for all the pages in each group is chosen. If
the '--uniform' ('-u') option is simultaneously set
then the vertical cropping will be uniform over all
the pages and only the horizontal cropping will differ
between even and odd pages.

-g PAGESTR, -pg PAGESTR, --pages PAGESTR
Apply the cropping operation only to the selected
pages. The argument should be a list of the usual form
such as "2-4,5,9,20-30". The page-numbering is assumed
to start at 1. Ordering in the argument list is
unimportant, negative ranges are ignored, and pages
falling outside the document are ignored. Note that
restore information is always saved for all the pages
(in the ArtBox) unless '--noundosave' is selected.

-t BYTEVAL, --threshold BYTEVAL
Set the threshold for determining what is background
space (white). The value can be from 0 to 255, with
191 the default (75 percent). This option may not be
available for some configurations since the PDF must
be internally rendered as an image of pixels. In
particular, it is ignored when '--gsBbox' is selected.
Any pixel value over the threshold is considered to be
background (white), and any value below it is
considered to be text (black). Lowering the value
should tend to make the bounding boxes smaller. The
threshold may need to be lowered, for example, for
scanned images with greyish backgrounds.

-nb INT, --numBlurs INT
When PDF files are explicitly rendered to image files,
apply a blur operation to the resulting images this
many times. This can be useful for noisy images.

-ns INT, --numSmooths INT
When PDF files are explicitly rendered to image files,
apply a smoothing operation to the resulting images
this many times. This can be useful for noisy
images.

-gs, --gsBbox         Use Ghostscript to find the bounding boxes for the
pages. The alternative is to explicitly render the PDF
pages to image files and calculate bounding boxes from
the images. This method tends to be much faster, but
it does not work with scanned PDF documents. It also
does not allow for choosing the threshold value,
applying blurs, etc. Any resolution options are passed
to the Ghostscript bbox device. This option requires
that Ghostscript be available in the PATH as
"gswin32c.exe" or "gswin64c.exe" on Windows, or as
"gs" on Linux. When this option is set the PIL image
library for Python is not required.

-gsr, --gsRender      Use Ghostscript to render the PDF pages to images. By
default the pdftoppm program will be preferred for the
rendering, if it is found. Note that this option has
no effect if '--gsBbox' is chosen, since then no
explicit rendering is done.

-x DPI, --resX DPI    The x-resolution in dots per inch to use when the
image is rendered to find the bounding boxes. The
default is 150. Higher values produce more precise
bounding boxes.

-y DPI, --resY DPI    The y-resolution in dots per inch to use when the
image is rendered to find the bounding boxes. The
default is 150. Higher values produce more precise
bounding boxes.

-b [m|c|t|a|b], --boxesToSet [m|c|t|a|b]
By default the pdfCropMargins program sets both the
MediaBox and the CropBox for each page of the cropped
PDF document to the new, cropped page size. This
default setting is usually sufficient, but this option
can be used to select different PDF boxes to set. The
option takes one argument, which is the first letter
(lowercase) of a type of box. The choices are MediaBox
(m), CropBox (c), TrimBox (t), ArtBox (a), and
BleedBox (b). This option overrides the default and
can be repeated multiple times to set several box
types.

-f [m|c|t|a|b], --fullPageBox [m|c|t|a|b]
By default the program first (before any cropping is
calculated) sets the MediaBox and CropBox of each page
in (a copy of) the document to the intersection of its
previous MediaBox and CropBox. This ensures that the
cropping is relative to the usual document-view in
programs like Acrobat Reader. This essentially defines
what is assumed to be the full size of pages in the
document, and all cropping is then performed relative
to that full-page size. This option can be used to
alternately use the MediaBox, the CropBox, the
TrimBox, the ArtBox, or the BleedBox in defining the
full-page size. The option takes one argument, which
is the first letter (lowercase) of the type of box to
use. If the option is repeated then the intersection
of all the box arguments is used. Only one choice is
allowed in combination with the '-gs' option since
Ghostscript does its own internal rendering when
finding bounding boxes. The default with '-gs' is the
CropBox.

-r, --restore         This is a simple undo operation which essentially
undoes all the crops ever made by pdfCropMargins and
returns to the original margins (provided no other
program modified the Producer metadata or ArtBoxes).
By default, whenever this program crops a file for the
first time it saves the MediaBox intersected with the
CropBox as the new ArtBox (since the ArtBox is rarely
used). The Producer metadata is checked to see if this
was the first time. If so, the ArtBox for each page is
simply copied to the MediaBox and the CropBox for the
page. This restores the earlier view of the document,
such as in Acrobat Reader (but does not completely
restore the previous condition in cases where the
MediaBox and CropBox differed or the ArtBox had a
previous value). Any options such as '-u', '-p', and
'-a' which do not make sense in a restore operation
are ignored. Note that as far as default filenames the
operation is treated as just another crop operation
(the default-generated output filename still has a
"_cropped.pdf" suffix). The '--modifyOriginal' option
(or its query variant) can be used with this option.
Saving in the ArtBoxes can be disabled by using the '
--noundosave' option.

-A, --noundosave      Do not save any restore data in the ArtBox. This
option will need to be selected if the document
actually uses the ArtBox for anything important (which
is rare). Note that the '--restore' operation will not
work correctly for the cropped document if this option
is included in the cropping command. (The program does
not currently check for this when doing a restore.)

-gsf, --gsFix         Attempt to repair the input PDF file with Ghostscript
before it is read-in with PyPdf. This requires that
Ghostscript be available. (See the general description
text above for the actual command that is run.) This
can also be used to automatically convert some
PostScript files (.ps) to PDF for cropping. The
repaired PDF is written to a temporary file; the
original PDF file is not modified. The original
filename is treated as usual as far as automatic name-
generation, the '--modify-original' option, and so
forth. This option is often helpful if the program
hangs or raises an error due to a corrupted PDF file.
Note that when re-cropping a file already cropped by
pdfCropMargins this option is probably not be
necessary, and if it is used in a re-crop (at least
with current versions of Ghostscript) it will reset
the Producer metadata which the pdfCropMargins program
uses to tell if the file was already cropped by the
program (the '--restore' option will then restore to
the previous cropping, not the original cropping). So
this option is not recommended as something to use by
default unless you encounter many corrupted PDF files
and do not need to restore back to the original
margins.

-nc, --noclobber      Never overwrite an existing file as the output
file.

-pv PROG, --preview PROG
Run a PDF viewer on the cropped PDF output. The viewer
process is run in the background. The viewer is
launched after pdfCropMargins has finished all the
other. The only exception is when the '--
queryModifyOriginal' option is also selected. In that
case the viewer is launched before the query so that
the user can look at the output before deciding
whether or not to modify the original. (Note that
answering 'y' will then move the file out from under
the running viewer; close and re-open the file before
adding annotations, highlighting, etc.) The single
argument should be the path of the executable file or
script to run the chosen viewer. The viewer is assumed
to take exactly one argument, a PDF filename. For
example, on Linux the Acrobat Reader could be chosen
with /usr/bin/acroread or, if it is in the PATH,
simply acroread. A shell script or batch file wrapper
can be used to set any additional options for the
viewer.

-mo, --modifyOriginal
This option moves (renames) the original file to a
backup filename and then moves the cropped file to the
original filename. Thus it effectively modifies the
original file and makes a backup copy of the original,
unmodified file. The backup filename for the original
document is always generated from the original
filename; any prefix or suffix which would be added by
the program to generate a filename (by default a
"_cropped" suffix) is modified accordingly (by default
to "_uncropped"). The '--usePrefix', '--
stringUncropped', and '--stringSeparator' options can
all be used to customize the generated backup
filename. This operation is performed last, so if a
previous operation fails the original document will be
unchanged. Be warned that running pdfCropMargins twice
on the same source filename will modify the original
file; the '-noclobberOriginal' option can be used to
avoid this.

-q, --queryModifyOriginal
This option selects the '--modifyOriginal' option, but
queries the user about whether to actually do the
final move operation. This works well with the '--
preview' option: if the preview looks good you can opt
to modify the original file (keeping a copy of the
original). If you decline then the files are not
swapped (and are just as if the '--modifyOriginal'

-nco, --noclobberOriginal
If the '--modifyOriginal' option is selected, do not
ever overwrite an existing file as the backup copy for
the original file. This essentially does the move
operations for the '--modifyOriginal' option in
noclobber mode, and prints a warning if it fails. On
failure the result is exactly as if the '--
modifyOriginal' option had not been selected. This
option is redundant if the ordinary '--noclobber'
option is also set.

-pf, --usePrefix      Prepend a prefix-string when generating default file
names rather than appending a suffix-string. The same
string value is used, either the default or the one
set via the '--stringCropped' or '--stringUncropped'
option. With the default values for the other options
and no output file specified, this option causes the
cropped output for the input file "document.pdf" to be
written to the file named "cropped_document.pdf"
(instead of to the default filename
"document_cropped.pdf").

-sc STR, --stringCropped STR
This option can be used to set the string which will
be appended (or prepended) to the document filename
when automatically generating the output filename for
a cropped file. The default value is "cropped".

-su STR, --stringUncropped STR
This option can be used to set the string which will
be appended (or prepended) to the document filename
when automatically generating the output filename for
the original, uncropped file. The default value is
"uncropped".

-ss STR, --stringSeparator STR
This option can be used to set the separator string
which will be used when appending or prependeding
string values to automatically generate filenames. The
default value is "_".

Specify a password to be used to decrypt an encrypted
PDF file. Note that decrypting with an empty password
is always tried, so this option is only needed for
non-empty passwords. The resulting cropped file will
not be encrypted, so use caution if important data is
involved.

-spr FLOAT:FLOAT, --setPageRatios FLOAT:FLOAT
Force all the cropped page ratios to equal the set
ratio. All crops are calculated and applied as usual,
but either the left and right margins will be
increased equally or else the top and bottom margins
will be increased equally in order to make the ratio
of width to height equal the set value. Margins are
only ever increased. The format for the ratio is
either a string width-to-height ratio such as '4.5:3'
or else a floating point number like '0.75' which is
the width divided by the height. This option can be
useful in some PDF viewers.

-prw FLOAT FLOAT FLOAT FLOAT, --pageRatioWeights FLOAT FLOAT FLOAT FLOAT
This option weights any whitespace added by the '--
setPageRatios' argument. It takes four weight
arguments, one per margin. The four floating point
arguments should be the left, bottom, right, and top
weights, respectively. The weights determine what
proportion of the total height(width) increase
necessary to achieve the target page ratio is added to
the corresponding margin. All weights must be greater
than zero.

-dcb STR, --docCatBlacklist STR
Data associated with the full document, such as
outlines, bookmarks, and modes, is saved in the
document catalog of the PDF file. By default it is all
copied over to the cropped document if possible (with
some exceptions, e.g., "/Pages" will be modified by
cropping). If this is not wanted, or if it causes
problems for a document, this option specifies a
blacklist of document catalog items that will never be
copied. The arguments should be passed as a single,
quoted, whitespace-separated string, for example
"/Outlines /PageMode /OpenAction". The special value
"ALL" blacklists everything. An empty string
blacklists nothing, and is the default. As an example,
it can be useful to blacklist "/OpenAction" if on
opening the PDF it does something like zooming which
is not desired. Blacklisting /PageMode can also be
useful to, for example, not open the outline by
default. Running in verbose mode '-v' will show which
document catalog items are and are not being copied
for a document.

-dcw STR, --docCatWhitelist STR
See the '--docCatBlacklist' option. This is just a
whitelist that essentially works the same way. The
whitelist takes precedence over the blacklist. It
specifies a list of items which will always be copied
over even if they are in the blacklist. Useful
combined with setting the blacklist to "ALL" if you
only want one or two of the items. The default value
is the empty string, which whitelists nothing and so
only the blacklist is used. Setting to "ALL"
guarantees that everything possible is copied over.

-i, --showImages      When explicitly rendering PDF files to image files,
display the inverse image files that are used to find
the bounding boxes. Useful for debugging and for
choosing some of the other parameters (such as the
threshold). This option requires a default external
viewer program selected by the Pillow image
manipulation package (xv on Unix, and usually Paint on
Windows).

-pdl, --pdftoppmLocal
Use a locally-packaged pdftoppm executable rather than
the system version. This option is only available on
Windows machines; it is ignored otherwise. By default
the first pdftoppm executable found in the directories
in the PATH environment variable is used. On Windows
the program will revert to this option if PDF image-
rendering is required and no system pdftoppm or
Ghostscript executable can be found. The locally-
packaged pdftoppm executable is a few years old, but
for page-cropping it only needs to get the margins
right.

-gsp PATH, --ghostscriptPath PATH
Pass in a pathname to the ghostscript executable that
the program should use. No globbing is done. Useful
when the program is in a nonstandard location.

-ppp PATH, --pdftoppmPath PATH
Pass in a pathname to the pdftoppm executable that the
program should use. No globbing is done. Useful when
the program is in a nonstandard location.

The pdfCropMargins program is Copyright (c) 2014 by Allen Barker.
Released under the GNU GPL license, version 3 or later.

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