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Diff Generator Online

Paste two versions of text and generate a readable diff (additions, removals, and replacements). Everything runs client-side in your browser—no upload.

Category: Text · URL: /tools/diff-generator-online.html
Output uses a unified-style format: + added, - removed, unchanged.
Client-side only.
Run a diff to see results here.
Related tools: Text Checker English · Online Slug Generator · URL Slug Checker · Case Checker CS2 · Slug Tool 9mm · Online Markdown Table Generator · Slug Tool · Word to PDF (client-side)
Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Use this diff generator to compare two text versions and copy a clean result.

  1. Paste the older version into Text A and the newer version into Text B.
  2. Optionally enable Ignore whitespace or Ignore case to reduce noise.
  3. Click Generate Diff.
  4. Use Copy Output to copy the plain diff.
Keywords this page targets (natural cluster): diff generator online, online diff tool, text diff online, compare two texts, difference checker, generate diff between two texts, unified diff generator, git diff style text, line by line diff, word diff online, highlight text differences, ignore whitespace diff, ignore case diff, compare text files online, paste and compare text, diff checker free, text compare tool, string diff online, find changes between versions, diff output copy, side by side diff alternative, online change tracker
Secondary intents covered: Compare two pasted versions and see what changed, Generate a compact diff you can copy into an issue or review, Ignore whitespace/case to reduce noisy diffs, Spot replacements with inline word highlights, Quickly swap inputs to compare directionally, Get a simple added/removed/changed summary, Check edits in documentation, policies, or notes, Review small code/text changes without installing tools, Share a plain-text diff that renders well anywhere

FAQ

What does this diff generator output?

A unified-style diff where + lines are added, - lines are removed, and unchanged lines start with a space.

Is my text uploaded to a server?

No. The comparison runs in your browser; the tool JavaScript does not send network requests.

Can I ignore whitespace changes?

Yes—enable Ignore whitespace to treat repeated spaces and leading/trailing whitespace as equal for matching.

Can I ignore case differences?

Yes—enable Ignore case to match lines without considering uppercase/lowercase.

Why do I see a removed line followed by an added line?

That usually indicates a replacement (the line changed). With inline highlights enabled, word-level changes are emphasized inside the replaced lines.

How do I copy the diff?

Click Copy Output to copy a plain-text version of the diff (no HTML formatting).

What are the input limits?

To keep the tool fast and mobile-safe, very large inputs are blocked (character and line caps). If you hit the limit, compare smaller chunks.