Flask-Bcrypt
Brcrypt hashing for Flask.
Decision gist · record as of 2026-08-14
Yes. Flask-Bcrypt is a mature, actively maintained extension with no known vulnerabilities, low install friction, and a permissive license. It solves a critical security problem—password hashing—with a proven algorithm. Install it if you are building a Flask application that requires user authentication.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Installation is straightforward with low friction—a pure Python wheel with only two runtime dependencies (Flask and bcrypt).
- The package maintains active status with recent commits, though the latest release dates to 2022-04-05.
License · maintenance · safety
BSD (permissive) — BSD license is permissive, allowing use in commercial and proprietary projects with minimal restrictions beyond attribution.
last release 2022-04-05 (1592 days) · last repo commit 2026-04-22 · 327 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 2,323,862 downloads/mo, #3,140 on PyPI
Alternatives
Verify before relying
pip install flask-bcrypt
from flask import Flask
from flask_bcrypt import Bcrypt
app = Flask(__name__)
bcrypt = Bcrypt(app)
pw_hash = bcrypt.generate_password_hash('hunter2')
bcrypt.check_password_hash(pw_hash, 'hunter2') # returns True- Whether the 2022-04-05 release date reflects active maintenance or if the package is in maintenance-only mode
- Python version support beyond 3.7, 3.8, 3.9 listed in classifiers
What it is and what it does
Flask-Bcrypt is a Flask extension that integrates the bcrypt password-hashing algorithm into your application. Bcrypt is intentionally designed to be computationally slow, making it resistant to brute-force attacks even as hardware becomes faster—a significant advantage over older algorithms like MD5 or SHA1 that prioritize speed. The extension exposes two main methods: one to hash a password and one to verify a plaintext password against a stored hash.
You initialize it by passing your Flask app object to the Bcrypt class, then call its hashing and verification methods from anywhere in your application. It's a thin, focused wrapper around the bcrypt library, suitable for any Flask application that needs to store and validate user passwords securely.
Use it for
- Hash user passwords during registration or password-change workflows in a Flask web application
- Verify user-supplied passwords during login against stored bcrypt hashes
- Protect sensitive authentication data in multi-user web applications where password compromise is a security risk
- Replace weak or fast hashing algorithms in legacy Flask applications with a modern, attack-resistant alternative
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
Flask-Bcrypt is a mature, actively maintained extension with no known vulnerabilities, low install friction, and a permissive license. It solves a critical security problem—password hashing—with a proven algorithm. Install it if you are building a Flask application that requires user authentication.
Install
flask-bcrypt on PyPI
Before you install
Installation is straightforward with low friction—a pure Python wheel with only two runtime dependencies (Flask and bcrypt). The package maintains active status with recent commits, though the latest release dates to 2022-04-05.
License in practice
BSD license is permissive, allowing use in commercial and proprietary projects with minimal restrictions beyond attribution.
Quickstart
pip install flask-bcrypt
from flask import Flask
from flask_bcrypt import Bcrypt
app = Flask(__name__)
bcrypt = Bcrypt(app)
pw_hash = bcrypt.generate_password_hash('hunter2')
bcrypt.check_password_hash(pw_hash, 'hunter2') # returns TrueVerify before relying
- Whether the 2022-04-05 release date reflects active maintenance or if the package is in maintenance-only mode
- Python version support beyond 3.7, 3.8, 3.9 listed in classifiers
Package facts
| License | BSD permissive |
| Python support | Not specified |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 2 packagesFlaskbcrypt |
| Maintenance | Actively maintained 1,592 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 2,323,862 / month, #3,140 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Environment :: Web EnvironmentIntended Audience :: DevelopersLicense :: OSI Approved :: BSD LicenseOperating System :: OS IndependentProgramming Language :: PythonProgramming Language :: Python :: 3Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Topic :: Internet :: WWW/HTTP :: Dynamic ContentTopic :: Software Development :: Libraries :: Python Modules |
Evidence: Flask_Bcrypt-1.0.1-py3-none-any.whl
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See also bcrypt · pwdlib · AuthEncoding · passlib · libpass · Flask-HTTPAuth · Flask-Login · argon2-cffi · siphash · scrypt