How to use the Text Diff Checker
Paste the original text on one side and the new version on the other. Lines that were added, removed or kept are marked so you can scan the changes.
How the comparison works
The checker compares the two texts line by line and finds the largest set of lines they share in the same order. Anything only in the new version is marked as added, and anything only in the original is marked as removed. Lines that match exactly are shown as unchanged so you can follow the context.
Tips for useful results
Because it compares whole lines, a single changed word marks the whole line as changed, and so does a different number of spaces. Put one sentence or one item per line for finer detail. It works well for contract drafts, website copy, config files and short code snippets.
How it works
Line-based longest common subsequence comparison
Examples
- Two short versions
- The quick brown fox + The quick red fox jumps over the dog.
Limitations and assumptions
This is a line-based comparison, not a character-level or semantic diff. Large input is capped for responsiveness.
Frequently asked questions
How does it compare text?
It compares line by line using the longest common subsequence.
Does it show character changes?
No, it is line-based.
Is there a size limit?
Large inputs are capped for responsiveness.
Is my text uploaded?
No, it stays in your browser.