Text Diff Checker

Spot every change between two texts — word-level highlights, side-by-side or inline, ignore whitespace or case.

Stays on your device. This tool runs in your browser — nothing you paste or open ever leaves it. Nothing uploaded, nothing to leak.

Ignore whitespace Ignore case

Original

Changed

Difference

Paste text into both boxes to see the difference.

Inputs are very large — showing a line-level diff without word highlighting to stay fast.

The two texts are identical.

How to compare two texts

Paste the original on the left and the changed version on the right. The diff updates as you type: removed lines are red, added lines are green, and changed lines show the exact words that differ. Switch between side-by-side and inline views, and use the ignore options when spacing or capitalisation should not count as a change.

Diff Checker — TechWhack Score

9.8/10

Privacy 10/10

Both texts are compared in your browser — nothing is uploaded.
Speed 10/10

Shows the differences instantly.
Features 9/10

Goes line by line then highlights the exact words that changed, with side-by-side or inline views and ignore-whitespace/case options.
Free 10/10

No sign-up and no Pro paywall on the features that matter.

Verdict: Word-level diff highlighting with no Pro paywall — the syntax and upload features Diffchecker charges for, free and local.

Help us improve Was this tool useful? Tap a star. Thanks — your rating helps others find it.

Be the first to rate

Embed this tool on your site

<iframe src="https://techwhack.com/tools/dev/diff-checker/embed" width="100%" height="440" frameborder="0" loading="lazy"></iframe>
<!-- Powered by TechWhack -->

A diff checker compares two blocks of text and shows what was added, removed or changed between them. TechWhack goes line by line and then highlights the exact words that changed within each line, so you are not left guessing. View it side-by-side or inline, and ignore whitespace or case when you only care about real changes. Everything runs in your browser.

Line diff versus word diff

Most diff tools only tell you a whole line changed. TechWhack also runs a word-level pass on changed lines, so a one-character fix does not light up the entire line. The summary counts additions and deletions so you can gauge the size of a change at a glance.

FAQ

How do I compare two versions of a text or code file?Paste the original on one side and the changed version on the other, and differences are highlighted line by line with word-level detail inside changed lines. You can view them side by side or inline, whichever makes the changes clearer.

Can it ignore whitespace or capitalization differences?Yes. Options to ignore whitespace and ignore case let you focus on substantive changes rather than reformatting or capitalization noise. That is useful when comparing reindented code or text edited by different people.

What is the difference between line-level and word-level diffs?A line-level diff flags whole lines that changed, while word-level highlighting pinpoints exactly which words within a line differ. Showing both means you see which lines moved and the precise edits inside them.

Is my text sent to a server to compare it?No. The comparison runs in your browser, so both versions stay on your device and nothing is stored. You can diff confidential documents or proprietary code without uploading them.