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Uproot5

ROOT I/O in pure Python and NumPy.

From scikit-hep·Updated June 25, 2026·View on GitHub·

Uproot is a library for reading and writing [ROOT files](https://root.cern/) in pure Python and NumPy. The project is written primarily in Python, distributed under the BSD 3-Clause "New" or "Revised" License license, first published in 2020. Key topics include: analysis, big-data, bigdata, file-format, hep.

Latest release: v5.7.4Version 5.7.4
April 30, 2026View Changelog →
<img src="https://raw.githubusercontent.com/scikit-hep/uproot5/main/docs-img/logo/logo.svg" width="300px">

PyPI version
Conda-Forge
Python 3.10‒3.14
BSD-3 Clause License
Continuous integration tests

Scikit-HEP
DOI 10.5281/zenodo.4340632
Documentation
Gitter

NSF-1836650
NSF-2121686
NSF-2323298

Uproot is a library for reading and writing ROOT files in pure Python and NumPy.

Unlike the standard C++ ROOT implementation, Uproot is only an I/O library, primarily intended to stream data into machine learning libraries in Python. Unlike PyROOT and root_numpy, Uproot does not depend on C++ ROOT. Instead, it uses Numpy to cast blocks of data from the ROOT file as Numpy arrays.

<p align="center"><img src="https://raw.githubusercontent.com/scikit-hep/uproot5/main/docs-img/diagrams/abstraction-layers.svg" width="700px"></p>

Installation

Uproot can be installed from PyPI using pip.

bash
pip install uproot

Uproot is also available using conda.

bash
conda install -c conda-forge uproot

If you have already added conda-forge as a channel, the -c conda-forge is unnecessary. Adding the channel is recommended because it ensures that all of your packages use compatible versions (see conda-forge docs):

bash
conda config --add channels conda-forge conda update --all

Getting help

Start with the tutorials and reference documentation.

Installation for developers

Uproot is an ordinary Python library; you can get a copy of the code with

bash
git clone https://github.com/scikit-hep/uproot5.git

and install it locally by calling pip install -e . in the repository directory.

If you need to develop Awkward Array as well, see its installation for developers.

Dependencies

Uproot's only strict dependencies are Awkward, Cramjam, xxhash, fsspec, NumPy, packaging. Strict dependencies are automatically installed by pip (or conda).

The following libraries are also useful in conjunction with Uproot, but are not necessary. If you call a function that needs one, you'll be prompted to install it. (Conda installs most of these automatically.)

For accessing remote files:

  • s3fs: if reading files with s3:// URIs.
  • xrootd: if reading files with root:// URIs.
  • HTTP/S access is built in (Python standard library).

For distributed computing with Dask:

For exporting TTrees to Pandas:

  • pandas: if library="pd".
  • awkward-pandas: if library="pd" and the data have irregular structure ("jagged" arrays), see awkward-pandas.

For exporting histograms:

  • boost-histogram: if converting histograms to boost-histogram with histogram.to_boost().
  • hist: if converting histograms to hist with histogram.to_hist().

Acknowledgements

Support for this work was provided by NSF cooperative agreements OAC-1836650 and PHY-2323298 (IRIS-HEP), grant OAC-1450377 (DIANA/HEP), and PHY-2121686 (US-CMS LHC Ops).

Thanks especially to the gracious help of Uproot contributors (including the original repository).

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href="#infra-veprbl" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/nikoladze"><img src="https://avatars.githubusercontent.com/u/3707225?v=4?s=100" width="100px;" alt="Nikolai Hartmann"/><br /><sub><b>Nikolai Hartmann</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=nikoladze" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://www.lieret.net"><img src="https://avatars.githubusercontent.com/u/13602468?v=4?s=100" width="100px;" alt="Kilian Lieret"/><br /><sub><b>Kilian Lieret</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=klieret" title="Documentation">📖</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/dcervenkov"><img src="https://avatars.githubusercontent.com/u/23052054?v=4?s=100" width="100px;" alt="Daniel Cervenkov"/><br /><sub><b>Daniel Cervenkov</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=dcervenkov" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/beojan"><img src="https://avatars.githubusercontent.com/u/3727925?v=4?s=100" width="100px;" alt="Beojan Stanislaus"/><br /><sub><b>Beojan Stanislaus</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=beojan" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/agoose77"><img src="https://avatars.githubusercontent.com/u/1248413?v=4?s=100" width="100px;" alt="Angus Hollands"/><br /><sub><b>Angus Hollands</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=agoose77" title="Code">💻</a> <a href="#maintenance-agoose77" title="Maintenance">🚧</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/lobis"><img src="https://avatars.githubusercontent.com/u/35803280?v=4?s=100" width="100px;" alt="Luis Antonio Obis Aparicio"/><br /><sub><b>Luis Antonio Obis Aparicio</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=lobis" title="Code">💻</a></td> </tr> <tr> <td align="center" valign="top" width="14.28%"><a href="https://github.com/renyhp"><img src="https://avatars.githubusercontent.com/u/20142663?v=4?s=100" width="100px;" alt="renyhp"/><br /><sub><b>renyhp</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=renyhp" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/lgray"><img src="https://avatars.githubusercontent.com/u/1068089?v=4?s=100" width="100px;" alt="Lindsey Gray"/><br /><sub><b>Lindsey Gray</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=lgray" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/ioanaif"><img src="https://avatars.githubusercontent.com/u/9751871?v=4?s=100" width="100px;" alt="ioanaif"/><br /><sub><b>ioanaif</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=ioanaif" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/natsukium"><img src="https://avatars.githubusercontent.com/u/25083790?v=4?s=100" width="100px;" alt="OTABI Tomoya"/><br /><sub><b>OTABI Tomoya</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=natsukium" title="Tests">⚠️</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/JostMigenda"><img src="https://avatars.githubusercontent.com/u/16189747?v=4?s=100" width="100px;" alt="Jost Migenda"/><br /><sub><b>Jost Migenda</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=JostMigenda" title="Documentation">📖</a></td> <td align="center" valign="top" width="14.28%"><a href="http://glepage.com"><img src="https://avatars.githubusercontent.com/u/33058747?v=4?s=100" width="100px;" alt="Gaétan Lepage"/><br /><sub><b>Gaétan Lepage</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=GaetanLepage" title="Tests">⚠️</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/HaarigerHarald"><img src="https://avatars.githubusercontent.com/u/8050292?v=4?s=100" width="100px;" alt="HaarigerHarald"/><br /><sub><b>HaarigerHarald</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=HaarigerHarald" title="Code">💻</a></td> </tr> <tr> <td align="center" valign="top" width="14.28%"><a href="https://github.com/bnavigator"><img src="https://avatars.githubusercontent.com/u/4623504?v=4?s=100" width="100px;" alt="Ben Greiner"/><br /><sub><b>Ben Greiner</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=bnavigator" title="Tests">⚠️</a></td> <td align="center" valign="top" width="14.28%"><a href="http://tooldev.de"><img src="https://avatars.githubusercontent.com/u/1640386?v=4?s=100" width="100px;" alt="Robin Sonnabend"/><br /><sub><b>Robin Sonnabend</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=YSelfTool" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/bojohnson5"><img src="https://avatars.githubusercontent.com/u/20647190?v=4?s=100" width="100px;" alt="Bo Johnson"/><br /><sub><b>Bo Johnson</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=bojohnson5" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/milesgranger"><img src="https://avatars.githubusercontent.com/u/13764397?v=4?s=100" width="100px;" alt="Miles"/><br /><sub><b>Miles</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=milesgranger" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/djw9497"><img src="https://avatars.githubusercontent.com/u/51672890?v=4?s=100" width="100px;" alt="djw9497"/><br /><sub><b>djw9497</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=djw9497" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/Pepesob"><img src="https://avatars.githubusercontent.com/u/113636251?v=4?s=100" width="100px;" alt="Piotr Sobczyński"/><br /><sub><b>Piotr Sobczyński</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=Pepesob" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/giedrius2020"><img src="https://avatars.githubusercontent.com/u/71819123?v=4?s=100" width="100px;" alt="Giedrius Juškevičius"/><br /><sub><b>Giedrius Juškevičius</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=giedrius2020" title="Code">💻</a></td> </tr> <tr> <td align="center" valign="top" width="14.28%"><a href="https://github.com/MatousVozak"><img src="https://avatars.githubusercontent.com/u/33348191?v=4?s=100" width="100px;" alt="MatousVozak"/><br /><sub><b>MatousVozak</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=MatousVozak" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/rossodisera"><img src="https://avatars.githubusercontent.com/u/46961664?v=4?s=100" width="100px;" alt="Andrea Serafini"/><br /><sub><b>Andrea Serafini</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=rossodisera" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="http://www.ariostas.com"><img src="https://avatars.githubusercontent.com/u/7596837?v=4?s=100" width="100px;" alt="Andres Rios Tascon"/><br /><sub><b>Andres Rios Tascon</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=ariostas" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/ikrommyd"><img src="https://avatars.githubusercontent.com/u/82155404?v=4?s=100" width="100px;" alt="Iason Krommydas"/><br /><sub><b>Iason Krommydas</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=ikrommyd" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/fstrug"><img src="https://avatars.githubusercontent.com/u/84533949?v=4?s=100" width="100px;" alt="fstrug"/><br /><sub><b>fstrug</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=fstrug" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/zlmarshall"><img src="https://avatars.githubusercontent.com/u/10702398?v=4?s=100" width="100px;" alt="Zach Marshall"/><br /><sub><b>Zach Marshall</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=zlmarshall" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/mrzimu"><img src="https://avatars.githubusercontent.com/u/74824770?v=4?s=100" width="100px;" alt="Mingrun Li"/><br /><sub><b>Mingrun Li</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=mrzimu" title="Code">💻</a></td> </tr> <tr> <td align="center" valign="top" width="14.28%"><a href="https://github.com/ianna"><img src="https://avatars.githubusercontent.com/u/1390682?v=4?s=100" width="100px;" alt="Ianna Osborne"/><br /><sub><b>Ianna Osborne</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=ianna" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/Rachit931"><img src="https://avatars.githubusercontent.com/u/199397286?v=4?s=100" width="100px;" alt="Rachit931"/><br /><sub><b>Rachit931</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=Rachit931" title="Documentation">📖</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/wdconinc"><img src="https://avatars.githubusercontent.com/u/4656391?v=4?s=100" width="100px;" alt="Wouter Deconinck"/><br /><sub><b>Wouter Deconinck</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=wdconinc" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/KaranSinghDev"><img src="https://avatars.githubusercontent.com/u/102300776?v=4?s=100" width="100px;" alt="Karan Singh"/><br /><sub><b>Karan Singh</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=KaranSinghDev" title="Code">💻</a></td> <td align="center" valign="top" width="14.28%"><a href="https://github.com/nickwp"><img src="https://avatars.githubusercontent.com/u/9571544?v=4?s=100" width="100px;" alt="Nick Prouse"/><br /><sub><b>Nick Prouse</b></sub></a><br /><a href="https://github.com/scikit-hep/uproot5/commits?author=nickwp" title="Code">💻</a></td> </tr> </tbody> </table> <!-- markdownlint-restore --> <!-- prettier-ignore-end --> <!-- ALL-CONTRIBUTORS-LIST:END -->

💻: code, 📖: documentation, 🚇: infrastructure, 🚧: maintainance, ⚠: tests/feedback, 🤔: foundational ideas.

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