Repomix

Repomix is an open-source CLI and web tool that packages an entire codebase — local folder, GitHub URL, or zipped archive — into a single AI-friendly file in XML, Markdown, JSON, or plain text. We rate it 89/100 — the right pick for anyone who's tired of copy-pasting random files into ChatGPT, Claude, or Gemini and wants a deterministic, token-counted way to share full project context with an LLM.

What is Repomix?

Repomix is a free, MIT-licensed Node.js tool created by Kazuki Yamada (@yamadashy) and first published on July 13, 2024. It compresses a whole repository — directory tree, file contents, gitignored exclusions, and optional secret scanning — into one structured artifact that fits cleanly inside an LLM's context window. The repo has crossed 24,000 GitHub stars, 1,198 forks, and was nominated for the JSNation Open Source Awards 2025 "Powered by AI" category.

The problem it solves is unsexy but universal: large language models do their best work when they see all the relevant code at once, but tools like ChatGPT, Claude, and Gemini don't have a great native way to upload an entire repo. Before Repomix, most developers either pasted scattered snippets, manually concatenated files with shell scripts, or paid for a coding-specific IDE extension. Repomix turns that into a one-line command — npx repomix — that produces a deterministic, LLM-optimized file.

Key Features of Repomix

• Multiple AI-optimized output formats: XML (default, recommended for Claude), Markdown (best for ChatGPT/Gemini), JSON (for programmatic pipelines), and plain text. The XML format is structured around a <file_summary> + <directory_structure> + <files> schema that LLMs parse very accurately.
• Token counting per file and total: uses tiktoken to show you the GPT-style token cost of every file plus the full bundle, so you know whether you're going to bust a 200k or 1M context limit before you send it.
• Tree-sitter code compression: opt-in flag that strips function bodies and keeps only signatures, imports, exports, classes, and interfaces — typically cutting tokens by 60–80% while preserving structural understanding.
• Git-aware filtering: respects .gitignore automatically, plus its own .repomixignore, plus standard node_modules/.venv/build-folder exclusions out of the box.
• Secretlint security scanning: bundled Secretlint integration detects API keys, AWS credentials, GitHub tokens, and similar leaks before you paste your codebase into a third-party model.
• Remote repository processing: repomix --remote yamadashy/repomix packs any public GitHub repo without you having to clone it locally — useful for code review of dependencies or open-source projects.
• MCP Server mode: Repomix can run as a Model Context Protocol server, so Claude Desktop, Cursor, and any MCP client can pack and read codebases directly without leaving the chat.
• Browser extension and web UI: a Chrome extension and the repomix.com web interface let non-CLI users paste a GitHub URL and get a packed file in seconds.
• 16+ language docs: documentation is translated into 16 languages including Japanese, Spanish, Hindi, Portuguese, and Vietnamese — a level of i18n unusual for a solo-maintained project.

What Users Say About Repomix

Sentiment is overwhelmingly positive. On Reddit's r/ChatGPTCoding and r/LocalLLaMA, threads consistently rank Repomix above competing tools like GitIngest and code2prompt for one reason: the XML output format and Tree-sitter compression are what Claude in particular asks for. On Hacker News, a benchmark on the python-docs-samples repo showed Repomix producing roughly 56M tokens versus GitIngest's 69M and code2prompt's 57M for the same codebase — small but real efficiency gains compound at scale.

The most common complaint on GitHub Discussions and Reddit is the same: very large repositories (50k+ files) can blow past LLM context windows even after compression, and Repomix doesn't yet auto-shard the output across multiple files by topic. The other recurring feedback is that the Node.js dependency feels heavy for a tool people often install once and run from the command line — several users have requested a Go or Rust binary release. Both are open issues on the GitHub repo and acknowledged by the maintainer.

Repomix Pricing

Repomix is completely free and open source under the MIT License. There is no paid tier, no usage cap, and no telemetry sent home from the CLI. The optional hosted web UI at repomix.com is also free, processes everything in-browser, and explicitly states in the privacy policy that uploaded code is not stored server-side.

Plan	Price	Includes
CLI / Library	$0 (MIT)	Unlimited local and remote packing, all output formats, MCP server, Tree-sitter compression, Secretlint scanning
Web UI	$0	Browser-based packing of public GitHub repos, no signup required
Sponsorship	Optional	GitHub Sponsors page for the maintainer; not required to use any feature

Who Should Use Repomix?

Best for: developers who routinely paste code into ChatGPT, Claude, or Gemini and want a deterministic way to include full project context; teams running AI code reviews in CI; anyone building agents on top of MCP that need to read codebases; technical writers documenting unfamiliar repos with LLM help.

Not ideal for: developers who already use a deeply integrated IDE assistant like Cursor, GitHub Copilot Workspace, or Aider — those tools manage context internally and Repomix becomes redundant. Also overkill for one-off questions about a single file.

Pros and Cons

Pros:

• Free, MIT-licensed, no signup, no telemetry — the most permissive distribution model for a tool of this kind
• Deterministic XML output that Claude and ChatGPT parse with very high accuracy in real-world tests
• Token counting built in so you can plan around context limits before you send
• Tree-sitter compression typically cuts tokens by 60–80% on TypeScript/Python codebases
• Active maintenance: Yamada ships near-weekly releases and the repo had 24,000+ stars within ~22 months of launch

Cons:

• No automatic sharding for repos that exceed even 1M-token context windows after compression
• Node.js / npx install isn't ideal for users who don't already have Node on their system
• Web UI is convenient but limited to public GitHub repos — private repos still require the CLI
• Configuration complexity grows quickly once you add custom include/ignore patterns and per-file instructions

Alternatives to Repomix

The closest alternatives are GitIngest (Python-first, browser tool at gitingest.com, simpler but no Tree-sitter compression), code2prompt (Rust binary, fast, no XML format), and Yek (Rust, single-binary install, popular on Hacker News). For developers who already live inside an IDE assistant, Aider and Continue.dev handle context management without an external packer.

Verdict: Is Repomix Worth It?

Yes — and "worth it" is almost the wrong question for an MIT-licensed tool that takes 30 seconds to try. If you regularly hand code to an LLM outside your IDE, Repomix is the path of least resistance, and the XML+Tree-sitter combination is meaningfully better than the obvious alternatives. The 89/100 reflects that it's the best-in-class option for its specific job, with realistic limits around very large repos and a Node-only distribution that some users would prefer to see ported to Go or Rust.

Frequently Asked Questions

Is Repomix free?

Yes. Repomix is free and open-source under the MIT License. The CLI, the library, the MCP server, the browser extension, and the hosted web UI at repomix.com are all $0 with no usage limits.

What platforms does Repomix support?

Repomix runs on macOS, Linux, and Windows via Node.js 20+ (installed with npx repomix, npm install -g repomix, Yarn, Bun, Homebrew, or Docker). There's also a Chrome extension and a web UI for users who prefer not to install anything.

How does Repomix compare to GitIngest?

Both pack repositories into LLM-friendly text. Repomix offers more output formats (XML, Markdown, JSON, plain), Tree-sitter code compression, Secretlint scanning, and an MCP server. GitIngest is simpler and Python-based, which some users prefer for data-science workflows. On the same repo, Repomix typically produces ~20% fewer tokens.

Is Repomix open source?

Yes. Repomix is MIT-licensed and developed openly at github.com/yamadashy/repomix, with 24,000+ stars, 1,198 forks, and active maintenance by Kazuki Yamada and a community of contributors.

Can Repomix work with private repositories?

Yes — the CLI works on any local directory, including private repos cloned to your machine. The hosted web UI at repomix.com only supports public GitHub repos; for private repos you should use the CLI locally.