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Flexible and efficient upload handling for Flask

Project description

CI Status PyPI PyPI - Python Version


Flask-Reuploaded provides file uploads for Flask.

Notes on this package

This is an independently maintained version of Flask-Uploads based on the 0.2.1 version of the original, but also including four years of unreleased changes, at least not released to PyPI.

Noteworthy is the fix for the Werkzeug API change.


  • provide a stable drop-in replacement for Flask-Uploads

  • regain momentum for this widely used package

  • provide working PyPI packages

Migration guide from Flask-Uploads

Incompatibilities between Flask-Reuploaded and Flask-Uploads

As already mentioned, staying compatible with Flask-Uploads is one of this project’s goals.

Nevertheless, there are the following known incompatibilities:

  • the patch_request_class helper function has been removed; the function was only necessary for Flask 0.6 and earlier. Since then you can use Flask’s own MAX_CONTENT_LENGTH environment variable, so you don’t read more than this many bytes from the incoming request data.

  • autoserve of uploaded images now has been deactivated; this was a poorly documented “feature”, which even could have lead to unwanted data disclosure; if you want to activate the feature again, you need to set UPLOADS_AUTOSERVE=True

Uninstall and install

If you have used Flask-Uploads and want to migrate to Flask-Reuploaded, you only have to install Flask-Reuploaded instead of Flask-Uploads.

That’s all!

So, if you use pip to install your packages, instead of …

$ pip install `Flask-Uploads`  # don't do this! package is broken

… just do …

$ pip install `Flask-Reuploaded`

Flask-Reuploaded is a drop-in replacement.

This means you do not have to change a single line of code.


$ pip install Flask-Reuploaded

Getting started

create an UploadSet

from flask_uploads import IMAGES

photos = UploadSet("photos", IMAGES)

configure your Flask app and this extension

app.config["UPLOADED_PHOTOS_DEST"] = "static/img"
app.config["SECRET_KEY"] = os.urandom(24)
configure_uploads(app, photos)

use photos in your view function['photo'])

See below for a complete example.


You can find the documentation at:

You can generate the documentation locally:

tox -e docs

You can update the dependencies for documentation generation:

tox -e upgradedocs

Minimal example application

Application code, e.g.

import os

from flask import Flask, flash, render_template, request
# please note the import from `flask_uploads` - not `flask_reuploaded`!!
# this is done on purpose to stay compatible with `Flask-Uploads`
from flask_uploads import IMAGES, UploadSet, configure_uploads

app = Flask(__name__)
photos = UploadSet("photos", IMAGES)
app.config["UPLOADED_PHOTOS_DEST"] = "static/img"
app.config["SECRET_KEY"] = os.urandom(24)
configure_uploads(app, photos)

@app.route("/", methods=['GET', 'POST'])
def upload():
    if request.method == 'POST' and 'photo' in request.files:['photo'])
        flash("Photo saved successfully.")
        return render_template('upload.html')
    return render_template('upload.html')

HTML code for upload.html

<!doctype html>
<html lang=en>
    <meta charset=utf-8>
    <title>Flask-Reuploaded Example</title>
    {% with messages = get_flashed_messages() %}
    {% if messages %}
    <ul class=flashes>
    {% for message in messages %}
        <li>{{ message }}</li>
    {% endfor %}
    {% endif %}
    {% endwith %}

<form method=POST enctype=multipart/form-data action="{{ url_for('upload') }}">
    <input type=file name=photo>
    <button type="submit">Submit</button>

Project structure

The project structure would look as following…

❯ tree -I "__*|h*"
├── static
│   └── img
└── templates
    └── upload.html

Running the example application

In order to run the application, you have to enter the following commands…


❯ flask run

Then point your browser to


Contributions are more than welcome.

Please have a look at the open issues.

There is also a short contributing guide.


1.3.0 (2022.12.20)

  • improve documentation (#133)

  • drop support for Python 3.6

  • add support for Python 3.11

  • update dependencies for building documentation

1.2.0 (2021.11.07)

  • add contexts to coverage report

  • pin documentation dependencies to prevent future breakage

  • fix typing errors (mypy) with recently released Flask 2.0.1

  • add support for Python 3.10

1.1.0 (2021.05.09)

  • make type checkers aware that this library is using type annotations

1.0.0 (2021.04.07)

  • raise test coverage to 100%

  • use official Pallets theme for the documentation

  • remove deprecated patch_request_class helper function; use MAX_CONTENT_LENGTH instead.

  • autoserve now has been deactivated by default and needs explicit activation via the setting UPLOADS_AUTOSERVE=True


  • improve documentation of example app

  • document surprising autoserve feature

  • issue a warning when using autoserve without explicit configuration


  • add type annotations

  • drop support for Python 2 and Python 3.5 (#8)

  • deprecate patch_request_class (#43)

  • use a src directory for source code (#21)

  • add tox env for check-python-versions (#20)

  • add flake8-bugbear

  • add short contribution guide (#6)

  • add getting started (#59)

  • delete broken example and add minimal example to README (#15)

  • add support for Python 3.9

  • use gh actions instead of Travis CI


  • documentation update (#5)

    • update docs/index.rst

    • use blue ReadTheDocs theme

    • update sphinx configuration

    • add documentation link to, so it shows on PyPi

    • add note about documentation in the README file

    • delete old theme files

  • configure isort to force single line imports


  • add badges to README (# 31)

  • add migration guide from Flask-Uploads to Flask-Reuploaded (#11)

  • add packaging guide (#28)

  • update installation instruction in README


Besides including four years of unreleased changes from the original package, most notable the fix for the Werkzeug API change, the following changes happened since forking the original package.

  • rename package from Flask-Uploads to Flask-Reuploaded (#10)

  • update (#12)

  • start using (#4)

  • update README (#14)

  • setup CI (Travis) (#3)

  • fix broken tests (#13)

  • make use of pytest instead of the no longer maintained nose (#2)

  • add a changelog and start tracking changes (#1)

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