Free Text Diff Checker Online
Compare drafts, code snippets, notes or configuration text. Added and removed lines are highlighted so you can spot differences quickly.
Line-based comparison. Large files may use a simplified fallback.
Private: your files are processed in your browser and are never uploaded to our server.
How to use
- Paste the original text into the left box.
- Paste the revised text into the right box.
- Select Compare to highlight line-level changes.
Compare text and find line changes
The diff checker compares lines and highlights insertions, deletions and unchanged lines. For very large inputs, a bounded fallback comparison is used to keep browser memory responsive.
Text stays in your browser. This is a line-based comparison, not a semantic code analysis or merge conflict resolver.
Frequently asked questions
Can I compare code?
Yes, it can compare code as text line by line, but it does not parse programming languages or assess whether code is correct.
Does it upload my text?
No. Comparison happens locally in your browser.
What happens with very large text?
To protect browser performance, the tool limits the exact diff algorithm for very large inputs and uses a simpler comparison.