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Text Diff

Paste two pieces of text or code and highlight the differences word-, line-, or character-by-character. Great for comparing ChatGPT vs Claude output, or diffing two content drafts.

All tools Browser-only

Text A (original)

Text B (new)

Mode: By word By line By character Ignore case Ignore whitespace

Differences

In B but not in A (added) In A but not in B (removed)

Added

Removed

Unchanged

Enter text in both boxes above to compare

When to use this

Compare AI outputs: paste output from two models (ChatGPT vs Claude vs Gemini) and see where they differ — which one is more concise, which adds extra fluff.
Diff content drafts: v1 vs v2 of an article, see what an editor changed.
Simple code diff: short code snippets — verify a bug fix or refactor.
Verify translations: paste original + back-translation, spot meaning loss.

3 diff modes

By word (default): best for prose and natural language.
By line: like git diff — for code or config files.
By character: maximum detail — catches typos and punctuation changes.

Who this is for

Developers using ChatGPT/Claude/Gemini daily, AI engineers building RAG/agents, anyone paying LLM API and wanting quick metrics.

FAQ

Is my pasted data sent anywhere?

No. The tool runs 100% in your browser — no HTTP requests to TopDev servers or any AI provider. You can disconnect from the internet to verify.

Is this tool free forever?

Yes. All TopDev tools are free, no signup required, no usage limits.

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