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Up-to-date simple useragent faker with real world database

Project description

Test & Deploy fake-useragent


Up-to-date simple useragent faker with real world database.


  • Data is pre-downloaded from and the data is part of the package
  • Retrieves user-agent strings locally
  • Supports Python 3.x


pip install fake-useragent

Or if you have multiple Python / pip versions installed, use pip3:

pip3 install fake-useragent


Simple usage example, see below for more examples:

from fake_useragent import UserAgent
ua = UserAgent()

# Get a random browser user-agent string

# Or get user-agent string from a specific browser
# Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36
# Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/537.13 (KHTML, like Gecko) Chrome/24.0.1290.1 Safari/537.13
print(ua['google chrome'])
# Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36
# Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0
# Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0
# Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.2 Safari/605.1.15

Additional usage

Additional features that fake-useragent now offers since v1.2.0.

If you want to specify your own browser list, you can do that via the browsers argument (default is: ["chrome", "edge", "firefox", "safari"]).
This example will only return random useragents from Edge and Chrome:

from fake_useragent import UserAgent
ua = UserAgent(browsers=['edge', 'chrome'])

Note: Fakeuser-agent knowns about: Chrome, Edge, Firefox and Safari. Other browsers are not popular enough and aren't part of our dataset we use.

If you want to specify your own operating systems, you can do that via the os argument (default is: ["windows", "macos", "linux"]).
In this example you will only get Linux useragents back:

from fake_useragent import UserAgent
ua = UserAgent(os='linux')

If you want to return more popular useragent strings, you can play with the min_percentage argument (default is: 0.0, meaning all useragents will match).
In this example you get only useragents that have a minimum usage percentage of 1.3% (or higher):

from fake_useragent import UserAgent
ua = UserAgent(min_percentage=1.3)

Hint: Of-course you can combine all those arguments to you liking!


You can override the fallback string using the fallback parameter, in very rare cases something failed:

import fake_useragent

ua = fake_useragent.UserAgent(fallback='your favorite Browser')
# in case if something went wrong, one more time it is REALLY!!! rare case
ua.random == 'your favorite Browser'

If you will try to get unknown browser:

from fake_useragent import UserAgent
ua = UserAgent()
#Error occurred during getting browser: randm, but was suppressed with fallback.
#Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36

If you need to safe some attributes from overriding them in UserAgent by __getattr__ method use safe_attrs you can pass there attributes names. At least this will prevent you from raising FakeUserAgentError when attribute not found.

For example, when using fakeuseragent with injections <> you need to:

import fake_useragent

ua = fake_useragent.UserAgent(safe_attrs=('__injections__',))

Please, do not use if you don't understand why you need this. This is magic for rarely extreme case.

Experiencing issues?

Make sure that you using latest version!

pip install --upgrade fake-useragent

Or if that isn't working, try to install the latest package version like this (1.2.0 is an example, check what the latest version is on PyPi):

pip install fake-useragent==1.2.0

Check version via the Python console:

import fake_useragent


And you are always welcome to post issues.

Please do not forget to mention the version that you are using.

For Developers

Since GitHub Actions is unable to reach and has Cloudflare protection. We can run the script below to automatically scrape the user-agent strings from the external data source. The script will copy the JSONlines file to the src/fake_useragent/data directory. Execute:


The data JSON file is part of the Python package, see pyproject.toml. Read more about Data files support.

Python Virtual Environment

We encourage to use Python virtual environment before installing Pip packages, like so:

python -m virtualenv env
source env/bin/activate


pip install -r requirements.txt


To fix imports:

pip install -r requirements.txt
ruff --select="I" --fix .


  • 1.2.1 August 2, 2023

    • Small improvements in the min_percentage check
    • Update all Pip package dependencies
  • 1.2.0 August 2, 2023

    • Updated browser useragent data
    • Allow filters on browser, OS and usage percentage
    • Update the cache scraper to scape the new data source for user-agent strings
    • Adapted the code to work with the new JSON data format
  • 1.1.3 March 20, 2023

    • Update dependencies
  • 1.1.2 February 8, 2023

    • Security fixes
  • 1.1.1 December 4, 2022

    • Remove whitespaces from user agent strings, this is a patch release
  • 1.1.0 November 26, 2022

    • Add pkg_resource as fallback mechanism in trying to retrieve the local JSON data file
  • 1.0.1 November 10, 2022

    • Add importlib-metadata & importlib-resources as dependencies
    • Check on specific Python version regarding the importlib resources (python v3.10 or higher) in order to have files() working
    • importlib_metadata should now also work on Python version before 3.8
    • Remove obsolete file
  • 1.0.0 November 17, 2022

    • Make the JSON Lines data file part of the Python package, data is retrieved locally
      • Extend the myproject.toml file with package-data support
    • Remove centralized caching server implementation
    • Make real unit-tests which should run reliable, fast, independent and without Internet connection
  • 0.1.14 November 5, 2022

    • Improve code quality standards using modern Python >=3.7 syntax
    • Migrated to pyproject.toml build system format + syntax check
    • Add additional classifiers to the toml file
    • Improved tox.ini file
    • Improved GitHub Actions job using pip cache
    • And various small fixes
  • 0.1.13 October 21, 2022

    • Implement browsers argument, allowing you to override the browser names you want to use
    • Fix browser listing of Internet Explorer and Edge
    • Don't depend on anymore
    • Clean-up data (temp) file format
    • Update fallback cache server URL / use JSON Lines as file format
    • Move to GitHub Actions instead of Travis
    • Using black Python formatter in favour of Flake
  • 0.1.12 March 31, 2022

    • forked
  • 0.1.11 October 4, 2018

    • moved s3 + cloudfront fallback to, cuz someone from Florida did ~25M requests last month
  • 0.1.10 February 11, 2018

    • Minor fix docs cloudfront url
  • 0.1.9 February 11, 2018

    • fix renamed IE/Edge to Edge/IE
    • moved fallback to s3 + cloudfront
    • stop testing Python3.3 and pypy
  • 0.1.8 November 2, 2017

    • fix Can't connect to local MySQL server through socket
  • 0.1.7 April 2, 2017

    • fix broken README.rst
  • 0.1.6 April 2, 2017

    • fixes bug use_cache_server do not affected anything
    • <>_ moved to https
    • verify_ssl options added, by default it is True (urllib.urlopen ssl context for Python 2.7.9- and 3.4.3- is not supported)
  • 0.1.5 February 28, 2017

    • added ua.edge alias to Internet Explorer
    • starts displaying Edge statistic
    • Python 2.6 is not tested anymore
    • use_cache_server option added
    • Increased fake_useragent.settings.HTTP_TIMEOUT to 5 seconds
  • 0.1.4 December 14, 2016

    • Added custom data file location support
    • Added fallback browser support, in case of unavailable data sources
    • Added alias fake_useragent.FakeUserAgent for fake_useragent.UserAgent
    • Added alias fake_useragent.UserAgentError for fake_useragent.FakeUserAgentError
    • Reduced fake_useragent.settings.HTTP_TIMEOUT to 3 seconds
    • Started migration to new data file format
    • Simplified a lot 4+ years out of date code
    • Better thread/greenlet safety
    • Added verbose logging
    • Added safe_attrs for prevent overriding by __getattr__
  • 0.1.3 November 24, 2016

    • Added hosted data file, when remote services is unavailable
    • Raises fake_useragent.errors.FakeUserAgentError in case when there is not way to download data
    • Raises fake_useragent.errors.FakeUserAgentError instead of None in case of unknown browser
    • Added gevent.sleep support in gevent patched environment when trying to download data
  • X.X.X xxxxxxx xx, xxxx

    • xxxxx ?????


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