PROTO file extension
The table below provides useful information about the .proto file extension. It answers questions such as:
- What is the .proto file?
- What program do I need to open a .proto file?
- How can the .proto file be opened, edited or printed?
- How can I convert .proto files to another format?
Table of Contents
- ✅ Protocol Buffers Data
- ✅ PureScript Protobuf Source Code
- 🔄 .proto file converters
- 🚫 .proto file related errors
We hope you find this page helpful and a valuable resource!
2 extension(s) and 0 alias(es) found in database
✅ Protocol Buffers Data

PROTO file is a Protocol Buffers Data. Protocol buffers (protobuf) are Google's language-neutral, platform-neutral, extensible mechanism for serializing structured data.
✅ PureScript Protobuf Source Code

PROTO file is a PureScript Protobuf Source Code. PureScript is a strongly-typed functional programming language that compiles to JavaScript.
Other types of files may also use the .proto file extension.
🚫 The .proto file extension is often given incorrectly!
According to the searches on our site, these misspellings were the most common in the past year:
Is it possible that the filename extension is misspelled?
We found the following similar file extensions in our database:
🔴 Can't open a .proto file?
When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:
Windows cannot open this file:
example.proto
To open this file, Windows needs to know what program you want to use to open it...
If you don't know how to set the .proto file association, check the FAQ.
🔴 Can I change the extension of files?
Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.
If you have helpful information about the .proto file extension, write to us!