How to use this text tool
- Paste the text you want to inspect or load the sample.
- Choose only the options that match your prompt format.
- Select Diff Versions or press Ctrl/Cmd + Enter.
- Read the summary and detailed output, then copy or download it.
Prompt Version Diff Tool
Prompt edits are easy to lose in a long document, especially when only a number or constraint changed. This tool creates a compact line diff between an old and a new version, with counts that can be copied into a review note. Everything runs in the browser, so private prompt text is not sent to a comparison service.
Text Input
Browser-only processingAd space
What this tool does
Create a line-level diff between two prompt versions with change counts and an exportable review record.
A longest-common-subsequence comparison identifies unchanged lines and marks additions and removals. Optional whitespace normalization prevents indentation-only edits from dominating the report.
This is a textual diff. It does not predict how a model’s behavior will change after the edit.
Example
Load the sample, run the tool, and compare the report with the visible markers or values in the input. The output is deterministic for the selected options, so the same text produces the same report.
Use cases
- Review a prompt before it enters a shared prompt library.
- Check generated content before another program consumes it.
- Create a lightweight audit record without uploading private text.
Tips for better output
- Keep separators and labels on their own lines.
- Use the narrowest option that matches your actual format.
- Test one valid and one deliberately invalid example.
- Review every warning in the surrounding context.
- Save the original text alongside important reports.
Processing details
A longest-common-subsequence comparison identifies unchanged lines and marks additions and removals. Optional whitespace normalization prevents indentation-only edits from dominating the report. Text remains in the current browser page during processing.
This is a textual diff. It does not predict how a model’s behavior will change after the edit.
Frequently asked questions
Does Prompt Version Diff Tool send my text to a server?
No. The processing in this page runs in your browser. Uploaded files are read locally by the page.
Can I use the result in a production prompt workflow?
Yes, but review the result first and test it with the exact model, template engine, or schema used by your application.
What happens when the input is empty or malformed?
The tool shows an input error instead of producing a misleading report. Tool-specific parsing errors include a short correction hint.
Can this tool guarantee that an AI response is safe or correct?
No. It checks the visible text using the stated rules. Model behavior, source quality, and application security still require separate review.
Is Unicode text supported?
Yes. The page accepts Unicode text, although pattern matching and token estimates may vary for scripts and formats outside the examples described.
Related text tools
Quick reference
| Item | Details |
|---|---|
| Processing | Local browser JavaScript |
| Input | Plain text or supported structured text |
| Exports | TXT, JSON, and tabular CSV when available |