browserutils

Protobuf Formatter

Format Protocol Buffer definition files

Protobuf Formatter is a free online tool from BrowserUtils that format protocol buffer definition files. It runs entirely in your browser — your data never leaves your device. No account required.

How to use Protobuf Formatter

  1. 1 Paste or type your input into the editor above.
  2. 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
  3. 3 Copy the result with one click or continue editing your input.

About Protobuf Formatter

Free online Protobuf formatter. Beautify .proto files with proper indentation, clean spacing, and consistent structure for readable Protocol Buffer definitions. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.

Protobuf Formatter specs

Runtime
100% client-side (browser)
Cost
Free — no account, no rate limits, no usage caps
Browser support
Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
Part of
299 developer tools on BrowserUtils (100% client-side)

Questions

What indentation does the formatter use?
The Protobuf formatter uses 2-space indentation, which is the standard convention for .proto files.
Does it handle all proto3 syntax?
Yes, the formatter handles message, enum, service, rpc, oneof, map, repeated, import, option, and package declarations with proper indentation and spacing.
Can I format proto2 files with this tool?
Yes, the formatter supports both proto2 and proto3 syntax. Keywords like required, optional, and extensions from proto2 are recognized and formatted correctly.
Does the Protobuf formatter preserve comments?
Yes, both single-line (//) and multi-line (/* */) comments within .proto files are preserved in their relative positions after formatting.
Embed this tool

Copy this code to embed the tool on your website. Adjust the height to fit your layout.

<iframe src="https://www.browserutils.dev/embed/protobuf-formatter" width="100%" height="500" frameborder="0" title="Protobuf Formatter"></iframe>

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