Text diff / compare

Free · no sign-up

Compare two blocks of text and see exactly what changed, line by line.

Original

Changed

Differences

Paste text on both sides to compare.

Runs entirely in your browser — your data never leaves your device and nothing is stored. No sign-up.

Compare two blocks of text and see exactly what changed, line by line. This free online text diff tool highlights added and removed lines instantly, right in your browser — paste an old and a new version of anything (code, config, contracts, copy) and read the changes at a glance. Nothing is uploaded; the comparison runs entirely on your device.

✓Line-by-line diff with added/removed highlighting
✓Live comparison as you paste — no button to press
✓A running count of added and removed lines
✓Copy the unified diff in one click
✓Runs in your browser — nothing is uploaded

Who it's for

Reviewing edits between two versions of a document
Spotting what changed in a config or JSON file
Checking a contract revision before signing
Comparing two snippets of code without git

How it works

1Paste the original text on the left.
2Paste the changed text on the right.
3Read the highlighted differences below.
4Copy the diff if you need to share it.

Frequently asked questions

What does a text diff show?+

It compares two versions of text and marks which lines were added, removed or left unchanged — the same idea as a git diff, but for any text.

Does it compare word by word?+

The comparison is line-based, which is the clearest view for code, config and documents. A changed line shows as one removed line plus one added line.

Is my text uploaded anywhere?+

No. The diff is computed locally in your browser — your text never leaves your device.

Can I compare code?+

Yes. It works well for source code, JSON, YAML, logs, contracts and any plain text — indentation and whitespace are preserved.