Text tool
Diff Checker
Compare text or code and spot every change. Nothing you paste leaves this browser.
Comparison
Add both versions above, then choose Compare.
About this tool
See exactly what changed
Comparing long documents by eye is slow and unreliable. This diff checker analyzes both versions line by line, then marks additions, removals, and unchanged content in a readable result.
Use the split view to scan two versions side by side, or switch to the unified view for a compact patch-style history. Optional filters help you ignore spacing and capitalization differences.
How it works
Compare text in three steps
- 1Add the original
Paste the earlier version into the left editor.
- 2Add the revision
Paste the new version into the right editor and choose any filters.
- 3Compare changes
Review the color-coded result in split or unified view.
Common questions
Diff Checker FAQ
What can I compare with this diff checker?
You can compare plain text, source code, configuration files, logs, lists, documentation, or any other line-based content.
Does UtilityBase store the text I compare?
No. The comparison runs locally in your browser. Your text is not sent to UtilityBase or stored on a server.
What do the colors mean?
Green rows are additions, coral rows are removals, and uncolored rows are unchanged. The split view aligns related changes side by side.
Can I ignore whitespace or capitalization?
Yes. Turn on either option before comparing to focus on meaningful text changes rather than spacing or letter case.