Diff Checker
Compare two texts and see the differences
About the Text Comparison Tool
This tool lets you compare text between two drafts of a document and see which lines were added, removed or reworded. It is aimed at editorial work — tracking changes across copy revisions, contracts and translations rather than source code.
Compare text when a document comes back and you need to know what someone touched. Marketing copy returned from legal, a policy page revised by a colleague, a translation that should match the source structure, or two drafts where the changes were never tracked.
The comparison is line based, so each paragraph is treated as a unit and a reworded sentence shows as a removal plus an addition. For prose that is usually what you want — it makes the paragraph that changed obvious without drowning you in word-level noise.
Nothing is uploaded, which matters for unpublished copy, contracts under negotiation and anything under embargo. For comparing source code with the same mechanism, the diff checker is the better labelled entry point.
How to use the Text Comparison Tool
- Paste the first draft. Put the original document text on one side.
- Paste the revised draft. Put the edited version on the other.
- Compare. Added and removed lines are highlighted, with a count of each.
- Work through the changes. Check each highlighted line against what you expected to change.
Text Comparison Tool features
- Line-by-line comparison of two drafts
- Added and removed lines highlighted separately
- Counts of added and removed lines
- Original line numbers kept on both sides
- Treats each paragraph as a unit, which suits prose
- Runs in your browser; neither draft is uploaded
Frequently asked questions
How is the comparison made?
Line by line. Each line is matched against the other document in order, and anything that does not match is reported as a removal from the first draft plus an addition to the second.
Why does one reworded sentence show as both a removal and an addition?
Because the comparison works on whole lines, not words. For prose this is usually what you want — it makes the paragraph that changed obvious instead of scattering highlights across every altered article and comma.
Is this suitable for comparing source code?
It will work, since code is lines of text, but the diff checker is the better labelled entry point for that. This page is aimed at editorial work: copy revisions, contracts and translations.
Is my text uploaded?
No. Both drafts stay in the browser tab and the comparison is computed locally, which matters for unpublished copy, contracts under negotiation and anything under embargo.
Can I save the comparison?
There is no export. The highlighted view is for reading on the page — select and copy from it if you need the text elsewhere.