Consistency & QA Free · in-browser · optional cloud history

Manuscript Diff

Compare two pasted versions word-by-word — see what changed between edits.

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Runs in your browser. Results can be saved so you can reopen them when signed in — guests are nudged after a couple of uses.
0 words 0 chars < 1 min
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Paste your text above, then click Analyze — or try Sample.

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About this tool

Track what changed between revision passes. This manuscript diff tool compares two pasted versions word-by-word — highlighting additions and deletions with word-count stats — so you can review AI edits, beta feedback, or your own rewrites without Microsoft Word.

Continuity checks across long manuscripts

Series bibles, name-variant lists, and POV slip detectors address the main failure mode of AI long-form writing: drift. Names change spelling, timelines compress, and point of view wobbles. Log facts as you write and re-scan after every major revision pass.

Story bible guide · Character consistency workflow

How to use it

  1. Paste the original text in Version A.
  2. Paste the revised text in Version B.
  3. Click Analyze to generate the word diff.
  4. Review green additions and red deletions.
  5. Use Swap to flip versions if needed.

Tips for fiction authors

  • Always diff your chapter before and after an AI editing pass. Models sometimes silently add or remove sentences you want to keep.
  • Save your pre-edit text before every major revision. Having "Version A" available makes diff reviews effortless.
  • When beta readers return marked-up chapters, diff against your original to isolate only the lines they changed.
  • Track word count delta in the diff stats. If your AI edit added 500 words, check whether it padded or genuinely expanded a scene.

Common questions

Is this a line diff or word diff?

Word-level diff — best for prose edits where sentence structure changes slightly.

Is my manuscript uploaded?

No. Diff runs entirely in your browser.

Can I compare AI-edited chapters?

Yes. Paste before and after AI revision to see exactly what changed.

Related guides

How to Build a Story Bible That AI Models Actually Follow How to Use AI to Design Legal Systems That Create Story Conflict How to Use AI to Design Magic Systems with Real Economic Costs How to Use AI to Build a Culture's Relationship with Death