Text Diff Checker
Compare two texts line by line.
Text Diff Checker at a glance
Text Diff Checker is a free online text tool you can use right now to compare two texts line by line โ no account, no install and no usage limit. It runs entirely inside your browser, so whatever you enter stays on your own device.
- Price
- Free โ no trial, no paid tier, no watermark
- Sign-up
- Not required
- Where it runs
- In your browser โ nothing is uploaded to a server
- Works on
- Chrome, Safari, Firefox and Edge โ desktop, tablet and phone
- Category
- Text Tools
About Text Diff Checker
The Text Diff Checker compares two blocks of text and highlights exactly what changed โ additions, deletions and edits โ so you can spot differences that are effectively invisible when reading side by side.
It's built for the cases where a single character matters: two versions of a contract, a config file that worked yesterday and doesn't today, a document returned with untracked edits, or two API responses that should be identical. The comparison works line by line and marks changes within a line, so a single altered word doesn't flag the whole paragraph.
It's particularly good at catching the differences human eyes skip โ trailing whitespace, a swapped hyphen and en-dash, straight versus curly quotes, or a stray non-breaking space pasted in from a web page.
How to use Text Diff Checker
- Paste or type your text.
- See the breakdown update in real time.
- Use the insights to improve your content.
Frequently asked questions
Does it detect whitespace differences?
Yes, including trailing spaces and tab-versus-space changes โ exactly the kind of difference that breaks a config file while looking identical on screen.
Can I compare code?
Yes. The comparison is plain-text and language-agnostic, so it works on any source file, config or markup.
Is my text uploaded?
No โ the comparison runs entirely in your browser, so contracts and private documents stay on your device.