Code Compare
Compare two code snippets and see the differences side by side
About the Code Comparison Tool
This tool lets you compare code between two snippets and see additions and deletions highlighted line by line. It works on anything text-based, including YAML and JSON config, and needs no repository, no commit and no upload of your code.
Compare code when the two versions are not both in version control. A snippet from a Stack Overflow answer against your own implementation, a config that works on staging but not production, a colleague's pasted function, or two API responses that should be identical.
Comparison is line based with additions and deletions marked separately, the same model git uses. That makes the size of a change immediately clear — a two-line difference reads very differently from a rewritten block.
Config file drift is the case this handles best. Two environments that differ by one setting are almost impossible to spot by eye and obvious in a diff. Everything runs in your browser, which matters when the config contains credentials.
How to use the Code Comparison Tool
- Paste the first snippet. Put one version in the left panel.
- Paste the second snippet. Put the other version in the right panel.
- Read the highlights. Additions and deletions are marked line by line.
- Act on the differences. Copy the version you want, or apply the specific change.
Code Comparison Tool features
- Line-by-line comparison of two code snippets
- Additions and deletions highlighted separately
- Works with any text-based language or config format
- No repository or commit required
- No length limit beyond device memory
- Runs entirely in your browser
Frequently asked questions
Which languages does it support?
Any text-based language or format. The comparison is line based, so source code, YAML, JSON and plain config all work.
Do I need a git repository?
No. Paste both versions directly — no repo, no commit and no setup required.
Is my code uploaded?
No. Comparison runs in your browser, so proprietary code and credentials stay on your machine.
How are changed lines shown?
A modified line appears as one deletion and one addition, which is the same model git uses.
Is there a size limit?
Nothing fixed. Large files are limited only by your device's memory.