rumdl
A fast Markdown linter written in Rust
Decision gist · record as of 2026-08-14
Yes, if you maintain Markdown documentation and want a fast, zero-dependency linter with broad rule coverage and auto-fix capability. The active maintenance, recent release cycle, and permissive license make it low-risk. Install friction is medium due to platform-specific wheels, but that is typical for Rust-compiled tools and does not affect usability once installed.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Medium install friction due to platform-specific wheels, but the package itself carries no runtime dependencies and is actively maintained with a recent release cycle (2 days since last release).
License · maintenance · safety
MIT (permissive) — MIT license is permissive; you can use, modify, and distribute this package freely with minimal restrictions.
last release 2026-08-12 (2 days) · last repo commit 2026-08-13 · 1,418 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 832,231 downloads/mo, #4,940 on PyPI
Alternatives
Verify before relying
pip install rumdl
rumdl check .
rumdl check --fix .- Whether the pip-installed version includes all 82 lint rules mentioned in the description or if some are Rust-only features.
- Performance characteristics on typical project sizes (the description benchmarks against 478 files but doesn't quantify typical speedup vs. alternatives).
- Whether configuration via pyproject.toml works identically to TOML-based config files.
What it is and what it does
rumdl is a Markdown linter and formatter written in Rust and distributed as a Python package. It scans Markdown files for style and consistency issues across 82 built-in rules, supports multiple Markdown flavors (GFM, MkDocs, MDX, Quarto, MyST), and can automatically fix many violations with the `--fix` flag. The tool is designed for speed and includes intelligent caching to skip unchanged files on subsequent runs.
When installed via pip, rumdl arrives as a pre-built binary with no runtime dependencies, making it a single-command install. It integrates with CI/CD pipelines, pre-commit hooks, and editor LSP servers. Configuration is TOML-based and discoverable, and it supports both text and JSON output formats for programmatic use.
Use it for
- Enforce consistent Markdown style across a documentation repository or wiki in CI/CD pipelines.
- Auto-fix common Markdown formatting issues (spacing, heading levels, list markers) across many files at once.
- Integrate into a pre-commit hook to catch Markdown violations before they reach version control.
- Lint Markdown in multiple flavors (GFM, MDX, Quarto) within a single project without switching tools.
- Watch mode linting during documentation writing with editor integration via LSP.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you maintain Markdown documentation and want a fast, zero-dependency linter with broad rule coverage and auto-fix capability.
The active maintenance, recent release cycle, and permissive license make it low-risk. Install friction is medium due to platform-specific wheels, but that is typical for Rust-compiled tools and does not affect usability once installed.
Install
rumdl on PyPI
Before you install
Medium install friction due to platform-specific wheels, but the package itself carries no runtime dependencies and is actively maintained with a recent release cycle (2 days since last release).
License in practice
MIT license is permissive; you can use, modify, and distribute this package freely with minimal restrictions.
Quickstart
pip install rumdl
rumdl check .
rumdl check --fix .Verify before relying
- Whether the pip-installed version includes all 82 lint rules mentioned in the description or if some are Rust-only features.
- Performance characteristics on typical project sizes (the description benchmarks against 478 files but doesn't quantify typical speedup vs. alternatives).
- Whether configuration via pyproject.toml works identically to TOML-based config files.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.9 |
| Install friction | Medium. Platform-specific wheel |
| Runtime dependencies | None |
| Maintenance | Actively maintained 2 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 832,231 / month, #4,940 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaEnvironment :: ConsoleIntended Audience :: DevelopersLicense :: OSI Approved :: MIT LicenseOperating System :: OS IndependentProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: 3.9Programming Language :: RustTopic :: Software Development :: Libraries :: Python ModulesTopic :: Software Development :: Quality AssuranceTopic :: Text Processing :: Markup :: Markdown |
Evidence: rumdl-0.2.55-py3-none-macosx_10_12_x86_64.whl; rumdl-0.2.55-py3-none-macosx_11_0_arm64.whl; rumdl-0.2.55-py3-none-manylinux_2_28_aarch64.whl; rumdl-0.2.55-py3-none-manylinux_2_28_x86_64.whl; rumdl-0.2.55-py3-none-musllinux_1_2_aarch64.whl; rumdl-0.2.55-py3-none-musllinux_1_2_x86_64.whl; rumdl-0.2.55-py3-none-win_amd64.whl
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