---
id: flask-babel
version: "4.0.0"
license: BSD-3-Clause
license_treatment: permissive
maintenance: dormant
---

# flask-babel — Adds i18n/l10n support for Flask applications.

License: permissive · Maintenance: dormant · Downloads: 15.6M/mo

## What it is and what it does

Flask-Babel integrates the Babel and pytz libraries into Flask applications to provide internationalization and localization capabilities. It handles message translation, date and time formatting across different locales, and timezone conversions, allowing a single Flask application to serve content in multiple languages and regional formats.

The package works by decorating your Flask app with Babel support, then using Babel's translation and formatting functions within your templates and Python code. It relies on Flask, Babel, pytz, and Jinja2 as runtime dependencies. The project is in production-stable status and supports Python 3.8 through 3.11, though maintenance has been dormant since late 2023.

Use it for:

- Build a Flask web application that serves the same content in multiple languages based on user preference or browser locale.
- Format dates, times, and numbers according to regional conventions (e.g., DD/MM/YYYY vs MM/DD/YYYY) without manual logic.
- Display timezone-aware timestamps correctly for users in different geographic regions.
- Translate user-facing strings in Jinja2 templates and Python view functions using gettext-style message catalogs.
- Support currency and number formatting that respects locale-specific conventions (decimal separators, thousand separators).

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Adds internationalization (i18n) and localization (l10n) support to Flask applications using Babel and pytz for date, time, and message translation.

Yes, if you need i18n/l10n in a Flask application. The package is production-stable, has low install friction, and no known vulnerabilities. The dormant maintenance is a minor concern—verify compatibility with your Flask and Babel versions before adopting, but the established user base and simple dependency chain make it a reliable choice for multi-language Flask projects.

## Install

pip install flask-babel
uv add flask-babel
poetry add flask-babel

## Installing flask-babel

Before you install: Low install friction with a pure-Python wheel distribution. Dormant maintenance status (last commit 2024-08-07, no release since 2023-10-02) but stable and widely used in production; 452 repository stars indicate established adoption.

License in practice: BSD-3-Clause is permissive; you can use, modify, and distribute this package freely in commercial and private projects with minimal restrictions.

Quickstart:

pip install flask-babel

from flask import Flask
from flask_babel import Babel

app = Flask(__name__)
Babel(app)

Verify before relying:

- Whether dormant maintenance (last release over 10 months old) affects compatibility with recent Flask or Babel versions.
- Whether the package handles all modern locale and timezone edge cases or if newer alternatives are more actively maintained.

## Package facts

- License: BSD-3-Clause (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: dormant
- Downloads: 15.6M/month (top 5,000 on PyPI)
- Known vulnerabilities: none known

## Tags

flask internationalization i18n, flask localization l10n, flask multi-language support, flask babel translation, flask timezone handling, flask message translation, flask language switching, i18n-l10n, flask-extension, translation

[View on SkillFed](https://skillfed.io/packages/flask-babel) · [View on PyPI](https://pypi.org/project/flask-babel/)