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Text Diff — Free Online Diff Checker (Line, Word & Character)

Compare two blocks of text — side-by-side, inline, or unified patch. Line, word, or character granularity.

Free No signup Client-side Privacy friendly Updated
+ added - removed unchanged Computing…

How to use

  1. 1 Paste the original text on the left, the modified text on the right.
  2. 2 Pick a view — side-by-side, inline, or unified patch.
  3. 3 Pick a granularity — line, word, or character.
  4. 4 Stats and color-coded output update live.

Why use this tool

  • Powered by Google's <code class="font-mono text-xs">diff-match-patch</code> — the same algorithm used in many production diff tools.
  • Pure client-side — your text never leaves the browser.
  • Multiple views — pick the format that fits your review.
  • Unified patch output is paste-ready for <code class="font-mono text-xs">patch -p0</code>.

Frequently asked questions

What's the difference between line, word, and character granularity?

Line groups changes by full lines (cleanest for code review). Word highlights edited words within a paragraph. Character is finest-grained — useful for small typo fixes.

Can I export the diff as a patch file?

Yes — pick the Patch view. The output uses the diff-match-patch unified format, compatible with most patch utilities.

Need to compare JSON or XML?

Use <a class="text-brand-600 hover:underline" href="/json-diff">JSON Diff</a> for structural JSON comparison.

Related tools?

<a class="text-brand-600 hover:underline" href="/json-formatter">JSON Formatter</a> for cleaning input before comparing; <a class="text-brand-600 hover:underline" href="/deduplicate-lines">Deduplicate Lines</a> for list cleanup.

What is Text Diff?

A Text Diff tool compares two blocks of text and highlights the additions, deletions, and unchanged regions. Line-level diffs match the behaviour of `git diff`; word- and character-level diffs surface small edits inside long lines. Three display modes are common: side-by-side (original vs new), inline (one stream with insertions/deletions marked), and unified patch (the format git produces).

How Text Diff compares to alternatives

Text Diff versus typical browser and desktop alternatives — features compared at a glance.
Feature Zerethon Tools Typical online tools Desktop apps
Side-by-side view Yes Yes Yes
Inline view Yes Sometimes Yes
Unified patch output Yes Rarely Yes
Line / word / character All three Line only All three
Content leaves device No Sometimes No
Free Yes Yes (with ads) Often paid
Summary

Text Diff is a free developer utility by Zerethon Tools. Compare two blocks of text — side-by-side, inline, or unified patch. Line, word, or character granularity. Runs entirely in the browser — no signup, no upload.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

Privacy

Your data never leaves your browser unless explicitly stated. Text Diff runs entirely client-side — no server upload, no logging, no tracking of your input.

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