# Chromium on GitHub: a source mirror with no build command and no releases

> chromium/chromium is the official GitHub mirror of the Chromium browser source, useful for engineers who need to read or patch the code that runs the web. It ships no binary, no releases and no install command, so the checkout procedure lives entirely outside the repository.

**chromium/chromium** — The official GitHub mirror of the Chromium source

- Repository: https://github.com/chromium/chromium
- Website: https://chromium.googlesource.com/chromium/src/
- Stars: 24,928 · Forks: 9,280
- Language: Unknown
- License: BSD-3-Clause
- Published: 2026-08-27 · Updated: 2026-08-27 · Language: en
- Canonical page: https://hysenlabs.com/projects/chromium-chromium

## The README blocks git clone and sends you to docs/get_the_code.md

Engineers who land on github.com/chromium/chromium usually arrive looking for a browser to download. What sits here is source, and the README opens with a prohibition instead of a command: check the code out locally by not using `git clone`, then follow the instructions in docs/get_the_code.md. That link is the whole installation story inside this repository. Getting a working copy, pulling in what the tree depends on and building anything at all happen outside the files you can read here. Among the root entries, DEPS, .gitmodules, .gn and BUILD.gn stand side by side, so dependency handling is wired into the tree rather than left to a package manifest you can inspect and install from.

## New top-level directories are for products, and executables live one level down

The layout rule in the README is short and specific. New top-level directories belong to a product, and the three it names are Chrome, Android WebView and Ash. Then the clause that settles where your code goes: even when a product has several executables, the code belongs in subdirectories of that product instead of a new top-level entry. The tree follows that split, with chrome/, chromeos/, chromecast/ and android_webview/ at the top next to shared machinery in base/, cc/, content/ and components/. Small legacy top-level directories also survive, kept for historical reasons, so the layout you find is less regular than the stated policy.

## OWNERS files pick the reviewer, and the presubmit layer lives in the tree

Two mechanisms stand between a patch and a human being. The first is ownership metadata. The root carries OWNERS, ATL_OWNERS, BRANCH_OWNERS, BRANCH_FEATURE_OWNERS, SECURITY_OWNERS, WATCHLISTS, AUTHORS and DIR_METADATA, and each of those has its own scoped counterparts inside subdirectories. The second is a presubmit layer checked into the repository: PRESUBMIT.py with PRESUBMIT_test.py and PRESUBMIT_test_mocks.py, CPPLINT.cfg for linting, and .clang-format, .clang-tidy, .clangd, .rustfmt.toml and .yapfignore for formatting. .gitattributes and .git-blame-ignore-revs sit beside them without explanation. The README describes none of this and does not document the command that runs the presubmit scripts locally, so both the review chain and the formatting rules have to be read out of the files themselves.

## The root package.json exists to stop TypeScript from leaving the repository

JavaScript in the tree is fenced in by a short file at the root that explains itself in comments. It gives two reasons for existing. First, it prevents the TypeScript compiler from reaching outside the repository root while traversing upwards looking for package.json files during module resolution. Second, it makes the compiler emit ES modules under the default module="NodeNext" configuration in tools/typescript/tsconfig_base.json.

```json
{
  "//1": "This file exists for the following reasons:",
  "//2": " 1) Prevent the TS compiler from reaching outside of the repository",
  "//5": " 2) Make the TS compiler emit ES modules with the default",
  "//6": "    module=\"NodeNext\" configuration in",
  "//7": "    tools/typescript/tsconfig_base.json",
  "type": "module"
}
```

The effect on anyone dropping a script into the tree is concrete: a root-level .js file is read as an ES module, so a CommonJS require call is not the safe default, and package lookup stops at this boundary instead of climbing into your home directory.

## CODE_OF_CONDUCT.md, codereview.settings and four agent-shaped directories

A handful of top-level entries describe process rather than browser code. CODE_OF_CONDUCT.md sets expectations for conduct, and codereview.settings configures the review tooling. Alongside them sit .agents/, .claude/, .gemini/ and agents/, each paired with a matching ignore file such as .cursorignore and .geminiignore. The names are descriptive enough to be read as configuration for machine assistants rather than for the browser. What none of them say, and what the README does not cover, is whether patches produced with those tools are welcome, whether they must be disclosed, or whether the presubmit checks treat them any differently from a hand-written change. A team deciding whether to contribute here has to read those files and derive its own policy before writing a line.

## The last push was on 2026-10-01 and there are no releases to pin

Commits are still arriving. The last push to this mirror was on 2026-10-01 and the repository is not archived, so the tree is current rather than frozen. That date is the only release signal the repository carries. There are no GitHub releases, which means no tag list, no changelog page and no version string to pin, and the default branch is main, so anything automated against it tracks a moving target. Licensing is BSD-3-Clause, with LICENSE.chromium_os in the root holding the ChromiumOS terms, which means a redistribution touching both browser and ChromiumOS code is reading two files rather than one. Upgrading here means following commits, and detecting which commits affect you is your problem.

## The mirror cannot hand you a browser, a build or a bug number

Three things people arrive for are absent by design. There is no binary to download and no build invocation anywhere in the README, so the checkout it points at leaves you with a source tree and nothing you can launch until you read docs/get_the_code.md and follow the steps kept there. There is also no issue tracker on the mirror. Bugs are routed to https://crbug.com/new, a separate system with its own triage and its own accounts. The consequence hits newcomers first: reading the README leaves you with directory structure, ownership files and no way to run the presubmit scripts, so a self-contained clone gets you nothing executable and no local check on your change.

## A mirror with no sync policy leaves the review path undefined

A mirror is a copy of a tree hosted somewhere else, and this repository does not document the copying. Its description calls it the official GitHub mirror of the Chromium source and the homepage it carries is chromium.googlesource.com/chromium/src/, so the canonical history lives on another host. Nothing here states how commits arrive, how often, or who resolves a divergence between the two. The README is equally silent on whether GitHub pull requests are reviewed at all, which is a different approach from working in the canonical tree through the project's own review tooling. Teams already tracking Chromium will read this copy as a window onto the code and pair it with crbug.com. Teams starting cold should treat it as reference material and learn the checkout from docs/get_the_code.md first.

## Conclusion

Use this mirror to trace a browser bug through Chromium's own source or to see which directory would own a patch. Do not treat it as a way to install or build a browser: nothing here produces an executable, checkout is delegated to docs/get_the_code.md, and bug reports go to crbug.com. Verify first that the steps in docs/get_the_code.md still match what you intend to build, since the README hands you no command to check that yourself.

## FAQ

### How do I install Chromium?

The README tells you not to use `git clone` and to follow docs/get_the_code.md for how to get the code. No package manager command or install script appears in the repository itself.

### How do I install Chromium on Ubuntu?

The README gives no steps for Ubuntu or any other distribution. Its only instruction is to obtain the code through docs/get_the_code.md rather than a plain clone, and the DEPS file at the root is the dependency declaration for that checkout.

### How do I run Chromium from the terminal?

No launch command is documented in the README. For anything that behaves wrongly in a running browser, the project routes bug reports to https://crbug.com/new rather than to this repository.

## Sources

- [Official documentation](https://chromium.googlesource.com/chromium/src/)
- [Official README](https://github.com/chromium/chromium#readme)
- [Project repository](https://github.com/chromium/chromium)

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Hysen Labs editorial analysis, written from the project's own repository and release notes. Cite the canonical page: https://hysenlabs.com/projects/chromium-chromium