Diff Checker

Paste two versions of a text and see exactly which lines were added or removed.

Runs in your browser — nothing is sent or saved.

How to compare two texts

  1. Paste the original text in the left box.
  2. Paste the changed text in the right box.
  3. The result appears below as you type.
  4. Lines with a + were added. Lines with a - were removed. Plain lines are the same.

What the tool compares

This is a line-by-line diff. It lines up the two texts and finds the smallest set of changes that turns the first into the second. That means it does not just mark everything after the first change as different. If you add one line in the middle, only that line is marked, and the rest stays matched. This is the same idea code tools use to show what changed between two versions.

When a diff helps

Use it to check what an editor changed in your writing, to compare two versions of a contract or email, or to spot the one setting that differs between a working config file and a broken one. It is also handy for finding the single new line in a long list, which is hard to see by eye.

A tip for cleaner results

The tool compares whole lines. If your text is one long paragraph, put each sentence on its own line in both boxes first. Then the diff can point to the exact sentence that changed, instead of marking the whole paragraph as different.

FAQ

Does it compare word by word or line by line?

Line by line. Each line is treated as one unit. To compare shorter pieces, split your text so each sentence sits on its own line.

Will it show a moved paragraph as changed?

A moved block shows as removed in its old spot and added in its new spot. The tool does not track moves as a single action.

Is there a size limit?

No. The compare runs on your device. Very large texts may take a moment on an older phone.

Are my two texts uploaded?

No. Both stay in your browser and are never sent to a server.

Can it ignore spaces or case?

Not yet. It compares lines exactly. Clean the text first if you want to ignore those.

What does a text compare tool show?

This diff tool lines up both versions and marks the difference between two texts line by line. Added lines show in green and removed lines in red. The text comparison runs live while you edit either side.