Mouse Melon: Thé best software for editing Protocol Buffers data

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• The downloads here are for both the free version and the paid version.
  The only limitation of the free version is that you cannot use it to save/export Protocol Buffers data.
• By downloading Mouse Melon you agree with the Terms and Conditions.

Version history

Version 1.3.1 (Windows only)

Released on 2026-07-18.
Download: Windows installer (.msi), Windows (.zip)

• The Windows version of Mouse Melon is now digitally signed for increased security. (The Mac version was already digitally signed)
• Includes Protocol Buffers 34.2

Version 1.3.0

Released on 2026-05-31.
Download: Windows installer (.msi), Windows (.zip), macOS (.dmg), Linux (.tar.gz)

• New: Export/copy in JSON (ProtoJSON) format
• New: Option to export only selected nodes
• New: Map items can be duplicated
• Improved: Last-used folders are remembered, so file dialogs start in a folder that makes sense
• Improved: In the project tab, type names in documentation can now be clicked for navigation
• Bug fix: Duplicating repeated items that contained repeated items themselves went wrong
• Several other improvements and bug fixes
• Includes Protocol Buffers 34.2

Version 1.2.1

Released on 2025-02-10.
Download: Windows installer (.msi), Windows (.zip), macOS (.dmg), Linux (.tar.gz)

• Bug fix: Public imports didn't work
• Includes Protocol Buffers 29.3

Version 1.2.0

Released on 2024-12-18.
Download: Windows installer (.msi), Windows (.zip), macOS (.dmg), Linux (.tar.gz)

• New: Customize font and colors
• New: Dark mode support on macOS and Linux
• Bug fix: The "save before closing" feature didn't work in 1.1.0
• Several other improvements and bug fixes
• Includes Protocol Buffers 28.3

Version 1.1.0

Released on 2024-12-03.
Download: Windows installer (.msi), Windows (.zip), macOS (.dmg), Linux (.tar.gz)

• New: Import and export hexadecimal and base-64 encoded data
• New: Edit stream/array of Protocol Buffers messages
• Improved the navigation tree in projects
• Several other improvements and bug fixes
• Includes Protocol Buffers 28.3

Version 1.0.0

Released on 2024-07-07.
Download: Windows installer (.msi), Windows (.zip), macOS (.dmg), Linux (.tar.gz)

• Includes Protocol Buffers 27.2