Find differences between texts.
Compare drafts, configuration, lists, or code without uploading either version.
🔒 Processed locallyYour input stays on this device and is never uploaded to Boring Tools.
Result
How to use Text Diff Checker
The checker uses a line-oriented longest-common-subsequence comparison. Unchanged lines stay neutral, removals are marked red, and additions are marked green.
Steps
- Paste the original text on the left.
- Paste the changed text on the right.
- Compare and review the marked lines.
Formats, limits, and accuracy
Line comparison is best for documents, lists, and code where line breaks carry meaning. It does not perform semantic or word-level interpretation.
Frequently asked questions
Are spaces significant?
Yes. Lines are compared exactly, including spaces.
Can it compare files?
Open text files locally and paste their contents into the two fields.
Practical notes
Large inputs can require more browser time because comparison grows with both line counts.
The comparison is not saved after the tab closes.