nh3
Python binding to Ammonia HTML sanitizer Rust crate
Decision gist · record as of 2026-08-14
Yes. nh3 is actively maintained, has no known vulnerabilities, carries a permissive MIT license, and solves a real security problem with a proven Rust implementation. The medium install friction is offset by prebuilt wheels for common platforms and the absence of runtime dependencies. Use it whenever you need to sanitize untrusted HTML.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.8 or later.
- Medium install friction due to compiled wheels, but prebuilt binaries are available for common platforms (CPython 3.8+, PyPy, macOS, Linux, Windows).
- Last release 53 days ago; repository is active with 391 stars.
License · maintenance · safety
MIT (permissive) — MIT license is permissive; you can use, modify, and distribute nh3 freely with minimal restrictions.
last release 2026-06-22 (53 days) · last repo commit 2026-08-10 · 391 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 54,059,510 downloads/mo, #545 on PyPI
Alternatives
Verify before relying
pip install nh3
import nh3
clean_html = nh3.clean('<p>Hello <script>alert(1)</script></p>')- Specific configuration options and allowed tag/attribute lists supported by nh3.clean()
- Whether nh3 provides escape or encoding functions beyond basic sanitization
- Performance characteristics on different HTML sizes and complexity levels
What it is and what it does
nh3 is a Python wrapper around the Rust ammonia HTML sanitization library. It removes potentially dangerous HTML tags and attributes—such as script tags, event handlers, and other XSS vectors—from user-supplied or untrusted HTML content. The package has no runtime dependencies and is distributed as precompiled wheels for most platforms, making installation straightforward.
The library is designed for developers who need to safely display user-generated HTML in web applications, content management systems, or any context where untrusted HTML must be rendered without security risk. It operates as a thin binding to ammonia's Rust implementation, which means sanitization happens at native speed rather than through Python logic.
Use it for
- Sanitize user comments or forum posts before displaying them on a website
- Clean HTML pasted from rich-text editors to prevent XSS attacks
- Filter email HTML content to remove malicious scripts before rendering
- Prepare user-submitted HTML for safe storage or republication
- Validate and clean HTML in content import workflows
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
nh3 is actively maintained, has no known vulnerabilities, carries a permissive MIT license, and solves a real security problem with a proven Rust implementation. The medium install friction is offset by prebuilt wheels for common platforms and the absence of runtime dependencies. Use it whenever you need to sanitize untrusted HTML.
Install
nh3 on PyPI
Before you install
Medium install friction due to compiled wheels, but prebuilt binaries are available for common platforms (CPython 3.8+, PyPy, macOS, Linux, Windows). Last release 53 days ago; repository is active with 391 stars.
Requires Python 3.8 or later.
License in practice
MIT license is permissive; you can use, modify, and distribute nh3 freely with minimal restrictions.
Quickstart
pip install nh3
import nh3
clean_html = nh3.clean('<p>Hello <script>alert(1)</script></p>')Verify before relying
- Specific configuration options and allowed tag/attribute lists supported by nh3.clean()
- Whether nh3 provides escape or encoding functions beyond basic sanitization
- Performance characteristics on different HTML sizes and complexity levels
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.8 |
| Install friction | Medium. Platform-specific wheel |
| Runtime dependencies | None |
| Maintenance | Actively maintained 53 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 54,059,510 / month, #545 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Programming Language :: Python :: Implementation :: CPythonProgramming Language :: Python :: Implementation :: PyPyProgramming Language :: RustTopic :: Software Development :: Libraries :: Python Modules |
Evidence: nh3-0.3.6-cp314-cp314t-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl; nh3-0.3.6-cp314-cp314t-manylinux_2_17_x86_64.manylinux2014_x86_64.whl; nh3-0.3.6-cp314-cp314t-manylinux_2_5_i686.manylinux1_i686.whl; nh3-0.3.6-cp314-cp314t-musllinux_1_2_aarch64.whl; nh3-0.3.6-cp314-cp314t-musllinux_1_2_armv7l.whl; nh3-0.3.6-cp314-cp314t-musllinux_1_2_i686.whl; nh3-0.3.6-cp314-cp314t-musllinux_1_2_x86_64.whl; nh3-0.3.6-cp314-cp314t-win32.whl; nh3-0.3.6-cp314-cp314t-win_amd64.whl; nh3-0.3.6-cp314-cp314t-win_arm64.whl; nh3-0.3.6-cp38-abi3-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl; nh3-0.3.6-cp38-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl; nh3-0.3.6-cp38-abi3-manylinux_2_17_armv7l.manylinux2014_armv7l.whl; nh3-0.3.6-cp38-abi3-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl; nh3-0.3.6-cp38-abi3-manylinux_2_17_ppc64.manylinux2014_ppc64.whl; nh3-0.3.6-cp38-abi3-manylinux_2_17_s390x.manylinux2014_s390x.whl; nh3-0.3.6-cp38-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl; nh3-0.3.6-cp38-abi3-manylinux_2_31_riscv64.whl; nh3-0.3.6-cp38-abi3-manylinux_2_5_i686.manylinux1_i686.whl; nh3-0.3.6-cp38-abi3-musllinux_1_2_aarch64.whl
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