What is the difference between a line diff and a word diff?

A line diff compares whole lines and marks which ones were added or removed, which is best for code and lists. A word diff looks inside changed lines and highlights the individual words that differ, which is better for prose where you want to see a single edited word rather than the whole sentence flagged. Showing both makes small and large changes easy to read.

Can it compare long documents?

Yes. Because the comparison runs on your own device, you can paste long documents on both sides without an upload step or a size cap. Larger texts take a moment more to compare but the highlighting is the same.

Does it change my text?

No. The diff only reads and highlights; it never edits either side. You can copy whichever version you want, but the tool leaves both texts exactly as you pasted them.

Is my text sent to a server?

No. Everything runs locally in your browser. Your text is read and processed on your own device, nothing is uploaded, and nothing is logged or stored. Once the page has loaded, it keeps working even if you go offline.

Text Diff Checker

Compare two texts online and see exactly what changed: lines and words that were added or removed are highlighted side by side. A free diff checker for drafts, contracts, code and config, running entirely in your browser.

No sign-up, ever
100% free
Nothing uploaded
Works offline after first load
No limits, no email wall

Read the guide: How to Compare Two Texts Online

Original

Changed

Differences0 added0 removed

Paste text on both sides to see what changed.

How to use it

1
Paste both versions

Put the original on one side and the changed version on the other.
2
See the differences

Added text is highlighted one way and removed text another, line by line and word by word.
3
Review and act

Read the changes, copy either side, and decide what to keep.

When it comes in handy

Document revisions

See what an editor or colleague changed between two versions of a draft or contract.

Code and config

Spot the exact lines that differ between two snippets, settings files or log outputs.

Proofreading

Compare a before-and-after to confirm an edit changed only what you intended.

Instant & 100% private — nothing is uploaded

Every keystroke is handled right here in your browser. Your text is never sent to a server, so there is no sign-up, no email wall, and no length cap from us. Load the page once and it keeps working even if you go offline.

Frequently asked questions

What is the difference between a line diff and a word diff?: A line diff compares whole lines and marks which ones were added or removed, which is best for code and lists. A word diff looks inside changed lines and highlights the individual words that differ, which is better for prose where you want to see a single edited word rather than the whole sentence flagged. Showing both makes small and large changes easy to read.
Can it compare long documents?: Yes. Because the comparison runs on your own device, you can paste long documents on both sides without an upload step or a size cap. Larger texts take a moment more to compare but the highlighting is the same.
Does it change my text?: No. The diff only reads and highlights; it never edits either side. You can copy whichever version you want, but the tool leaves both texts exactly as you pasted them.
Is my text sent to a server?: No. Everything runs locally in your browser. Your text is read and processed on your own device, nothing is uploaded, and nothing is logged or stored. Once the page has loaded, it keeps working even if you go offline.