pylopdf 0.6.0

PDF editing and rendering for Python, powered by Rust (lopdf + hayro). MIT, zero dependencies, lightweight wheels.

pylopdf

日本語版 README はこちら

PDF editing and rendering for Python, powered by Rust — lopdf for editing and hayro (the pure-Rust PDF renderer adopted by typst) for rendering.

MIT licensed, zero runtime dependencies, lightweight wheels. Covers the common pymupdf use cases without the AGPL.

Why pylopdf?

	pylopdf	pymupdf	pypdf	pypdfium2
License	MIT	AGPL / commercial	BSD	Apache/BSD
Wheel size	~3.5 MB	~40 MB+	small (pure Python)	~8 MB
Editing (merge / split / rotate / outlines)	✅	✅	✅	limited
Rendering (PNG / SVG)	✅	✅	❌	✅ (PNG)
Text extraction	✅ (basic)	✅ (advanced)	✅	✅
Encryption (AES-256)	✅ read & write	✅	✅	❌
CJK font fallback	✅ ([cjk] extra)	✅	—	manual
Implementation	pure Rust	C	Python	C++ (PDFium)

• Fits size-constrained environments such as AWS Lambda
• Safe for commercial projects that need to avoid the AGPL
• abi3: one wheel covers Python 3.10–3.14
• API modeled after pymupdf

Limitations: no precise layout analysis, no annotation/form editing. Use pymupdf if you need those.

Install

pip install pylopdf

To render Japanese PDFs without embedded fonts, install the optional CJK fonts (Noto Sans/Serif JP, auto-detected at render time):

pip install pylopdf[cjk]

Building from source (requires a Rust toolchain):

uv sync

Usage

import pylopdf

# Open from a path or bytes
doc = pylopdf.open("input.pdf")
doc = pylopdf.open(stream=pdf_bytes)

# Page count
print(doc.page_count)  # same as len(doc)

# Metadata
print(doc.metadata["title"])
doc.set_metadata({"title": "Monthly Report", "author": "Alice"})

# Text extraction (0-based page numbers)
text = doc.get_page_text(0)

# Rendering
png: bytes = doc.render_page(0)             # 72 dpi
png2x: bytes = doc.render_page(0, scale=2)  # 144 dpi
png300 = doc.render_page(0, dpi=300)        # by resolution
png_bg = doc.render_page(0, background=(255, 255, 255))  # white background (default: transparent)
svg: str = doc.render_page_svg(0)

# Delete pages (split)
doc.delete_page(0)
doc.delete_pages([1, 2])

# Keep/reorder pages (repeating a page duplicates it)
doc.select([2, 0])

# Page objects (0-based; negative counts from the end)
page = doc[0]
for page in doc:
    print(page.number, page.rect)
page.set_rotation(90)                # display rotation (multiples of 90)
page.set_mediabox((0, 0, 300, 400))  # page boxes

# Insert / copy pages
doc.new_page()          # blank A4 appended
doc.copy_page(0, to=1)  # duplicate page 0 in front of page 1

# Table of contents (page numbers are 1-based here, pymupdf-compatible)
doc.set_toc([[1, "Chapter 1", 1], [2, "Section 1.1", 2]])
print(doc.get_toc())

# Merge (with ranges, reversed order, and an insertion position)
merged = pylopdf.Document()
merged.insert_pdf(pylopdf.open("a.pdf"))
merged.insert_pdf(pylopdf.open("b.pdf"), from_page=0, to_page=2, start_at=0)

# Save
merged.save("merged.pdf")
data: bytes = merged.tobytes()

# Optimized save (prune unreferenced objects + compress + object streams)
merged.save("small.pdf", garbage=True, deflate=True, object_streams=True)

# Encrypted save (AES-256; owner_pw alone = open freely, restricted permissions)
merged.save("locked.pdf", user_pw="secret", permissions=pylopdf.Permissions.PRINT)

# Fast metadata probe without parsing the whole file
info = pylopdf.peek_metadata("input.pdf")
print(info["title"], info["page_count"], info["encrypted"])

# Context manager
with pylopdf.open("input.pdf") as doc:
    print(doc.metadata)

# Encrypted PDFs (RC4-40/128, AES-128, AES-256; empty user passwords open transparently)
doc = pylopdf.open("locked.pdf", password="secret")
doc = pylopdf.open("locked.pdf")
if doc.needs_pass:
    doc.authenticate("secret")  # 0=failed, 2=user, 4=owner, 6=both

# CJK fallback font for PDFs without embedded fonts
# (automatic with pylopdf[cjk]; or bring your own font)
doc.set_fallback_font("NotoSansJP-Regular.otf")
doc.set_fallback_font(font_bytes, kind="serif")

API

pylopdf.Document (pylopdf.open() is an alias constructor):

Method / property	Description
Document(filename=None, stream=None, password=None, max_decompressed_size=None)	Open from a path or bytes; empty document if both are None. max_decompressed_size guards against decompression bombs
doc[i] / load_page(pno) / for page in doc	Get a Page view (negative indices count from the end; re-fetch after structural changes)
needs_pass / is_encrypted	Encryption status (pymupdf-compatible semantics)
authenticate(password)	Decrypt with a password (returns 0/1/2/4/6, pymupdf-compatible)
page_count / len(doc)	Number of pages
metadata	Metadata dict (title, author, subject, keywords, creator, producer, creationDate, modDate, format)
set_metadata(dict)	Set metadata (empty string deletes the entry)
get_page_text(pno)	Extract text from a page
render_page(pno, scale=1.0, dpi=None, background=None)	Render a page to PNG bytes; dpi replaces scale, background is an RGB(A) fill (max 65,535 px per side / 64 MP total)
render_page_svg(pno)	Render a page to an SVG string
set_fallback_font(font, kind="sans", index=0)	Set a fallback font (path/bytes) for non-embedded CJK fonts; None disables auto-detection
select(page_numbers)	Keep only the given pages, in the given order (repeats duplicate the page)
delete_page(pno) / delete_pages(iterable)	Delete pages
insert_pdf(other, from_page=0, to_page=-1, start_at=-1)	Merge a page range (negative / reversed ranges; start_at sets the insertion position)
new_page(pno=-1, width=595, height=842) / copy_page(pno, to=-1)	Insert a blank page / duplicate a page
get_toc() / set_toc(toc)	Read/write outlines as [[level, title, page], ...] (page numbers are 1-based here)
save(filename, garbage=, deflate=, object_streams=, user_pw=, owner_pw=, permissions=) / tobytes(same)	Save; prune / compress / object streams, or AES-256 encryption via user_pw / owner_pw (the in-memory document stays plain)
close()	Close (supports with)

pylopdf.Page (obtained via doc[i]):

Method / property	Description
number / parent	0-based page number and owning Document
get_text() / render(scale, dpi=, background=) / render_svg()	Extraction and rendering
rotation / set_rotation(deg)	Display rotation (multiples of 90, inheritance-resolved)
mediabox / cropbox / rect	Page boxes (Rect); rect is the rotation-aware visible rectangle
set_mediabox(rect) / set_cropbox(rect)	Set page boxes

Module level:

Name	Description
peek_metadata(filename/stream, password=None)	Fast metadata / page-count / encryption probe without parsing the whole file
Permissions	Encryption permission flags (IntFlag)
Rect	Rectangle NamedTuple with width / height
Exceptions	PdfError (ValueError-compatible base), PasswordError, DocumentClosedError, EncryptedDocumentError, StalePageError

For low-level access, use pylopdf.pylopdf_core._Document (a thin lopdf wrapper) directly.

Architecture

Follows the division of labor in the 2026 Rust PDF ecosystem:

pylopdf.Document (Python, pymupdf-style API)
   └─ _Document (PyO3)
        ├─ lopdf 0.44   … editing: open → modify → save
        └─ hayro 0.7    … rendering: PNG / SVG (standard fonts embedded)

rust/          # PyO3 bindings
src/pylopdf/   # Python high-level API
tests/         # pytest (Rust behavior is verified through Python tests)

uv sync                    # build + install dependencies
uv run pytest              # tests
uv run ruff check .        # lint
uv run mypy src tests      # type check
uv build --wheel           # build a wheel

uv sync detects Rust source changes and rebuilds automatically (via tool.uv.cache-keys).

License

MIT (lopdf is MIT; hayro is MIT/Apache-2.0)