Diff checker: compare two texts
Paste two versions of a text or code and instantly see which lines were added, removed or changed, with the modified words highlighted.
Processed 100% in your browser
Ctrl + Enter runCtrl + C copy result
How to use
- 1Paste the original text into the left panel.
- 2Paste the modified version into the right panel.
- 3Click “Compare” (or Ctrl+Enter) and enable options to ignore case or whitespace.
- 4Review the highlighted differences and download them as a .diff file if needed.
Use cases
- Review changes between two versions of a contract or document.
- Compare code snippets or configuration files.
- Spot what changed in a translated or proofread text.
- Check that two lists or data exports are identical.
Frequently asked questions
How does the comparison work?
It uses the longest common subsequence (LCS) algorithm line by line and, on modified lines, a second word-level diff to highlight exactly what changed.
Is there a size limit?
You can compare very long texts: identical parts at the start and end are skipped before computing. You will only get a warning if the differing regions are huge, to avoid freezing the browser.
Are my texts uploaded to a server?
No. The whole comparison runs in your browser; your texts never leave your device.