Meet the Text Diff Checker
Paste two versions of a text — two drafts, two code snippets, or two config files — and see exactly what changed between them. Choose Line mode to compare whole lines at once (best for code
- Free to use
- No signup
- Nothing to install
- Works in any modern browser
Illustration. Open the tool for the real thing.
What is the Text Diff Checker?
Paste two versions of a text — two drafts, two code snippets, or two config files — and see exactly what changed between them. Choose Line mode to compare whole lines at once (best for code and config files) or Word mode to see which individual words within a changed line were added or removed (best for prose editing).
The result includes a similarity percentage based on the ratio of unchanged to total lines, plus toggles to ignore whitespace differences or case differences when you only care about substantive content changes, not formatting.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Compare whole lines for code/config files, or individual words within a line for prose.
An at-a-glance score showing how much the two texts diverge.
Filter out formatting-only differences to focus on real content changes.
Added and removed content is highlighted clearly, line by line or word by word.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
Developers
Compare two versions of a config file or code snippet to spot exactly what changed.
Try it freeWriters & editors
Track edits between draft versions of an article, contract or script.
Try it freeStudents
Compare their own revision against an earlier draft to see what was improved.
Try it freeHow it compares
A plain look at this tool next to the usual alternative.
| This text tool | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
Questions people ask
What is a diff checker?
A tool that compares two pieces of text and shows exactly what changed — lines or words added, removed, or modified.
What's the difference between Line and Word diff mode?
Line mode compares whole lines; Word mode finds which individual words within a changed line were added or removed.
What does the similarity percentage mean?
It's the ratio of unchanged to total lines across both texts — 100% means identical, 0% means completely different.
Is my text stored or sent anywhere?
The comparison is computed on the server as a standard form submission but is not stored, logged, or shared with any third party.
What do Ignore Whitespace and Ignore Case do?
Ignore Whitespace strips leading/trailing spaces before comparing; Ignore Case treats uppercase and lowercase as equal.
More free tools
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Try the Text Diff Checker now
Paste two versions of a text — two drafts, two code snippets, or two config files — and. Free to use.
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