Open C Online
View C source and header files.
Drop a file here
or
Your file stays on your device.
- Preview: Excellent
- File info: Yes
- Search: Yes
- Editing: Yes
About C files
.c files contain C source code, .h files the matching declarations.
Open Online highlights both with line numbers.
What you can do here
- Line numbers and syntax highlighting
- Search and replace
- Toggle word wrap
- Edit the text and save a copy
- See encoding, line endings, line and word counts
Limitations
- Very large files (over 50 MB) open read-only to keep the browser responsive.
Privacy
The file is read by your browser and stays on your device. Open Online has no server that could receive it, and nothing is stored once you close the tab. Privacy policy
Common questions
Are header files supported?
Yes, .h files open the same way.