Text Diff Checker: Compare Two Texts
What is Text Diff Checker: Compare Two Texts
A text diff checker compares two blocks of text and shows exactly what changed between them. Additions appear in green, removals in red, and unchanged content stays neutral, so you can spot edits at a glance instead of reading both versions side by side. You can compare line by line for documents and code, word by word for prose, or character by character for the finest detail. Everything runs locally in your browser, so your text never leaves your device.
How to use
- Paste the original text into the left field.
- Paste the changed version into the right field.
- Pick a comparison mode: Line, Word or Character.
- Read the highlighted result: green marks additions, red marks removals.
- Check the counter above the result for the number of additions and removals.
When to use it
Need to know what a colleague changed in a contract before you sign it? Paste both versions and the diff shows the three clauses that moved and the one sentence that was deleted. It is just as handy for spotting an edit in a block of code, checking two versions of an email draft, or confirming that a copy-paste really matched the source.
Frequently asked questions
What is the difference between line, word and character mode?
Line mode compares whole lines and is best for code and structured documents. Word mode highlights individual changed words and reads well for prose. Character mode marks every single changed character, useful for short strings or catching a typo.
Is my text uploaded to a server?
No. The comparison runs entirely in your browser with JavaScript. Nothing you paste is sent anywhere, which makes it safe for confidential or sensitive text.
Is there a limit on how much text I can compare?
There is no fixed limit, but very large inputs in character mode can be slow because the comparison work grows with text length. For long documents, line or word mode stays fast.
Can I compare code with this tool?
Yes. Line mode works well for source code, config files and JSON, showing added and removed lines the way a version control diff does.
Can I share this tool with my inputs pre-filled?
Yes. The URL updates automatically as you type. Copy it from the address bar or use the Copy link button, and anyone who opens the link will see your exact inputs ready to go.
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