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Diff Checker

Compare text side by side and spot tiny changes at a glance.

JSON Formatter
Diff Checker
Compare two text blocks side by side and generate a readable line-level diff without uploading content.
Ctrl+Enter Compare Line-by-line summary Copy diff
Original text Left side
1 line | 0 chars
Updated text Right side
1 line | 0 chars
Unified diff Read only output
0 additions | 0 removals | 0 changes
Ready Client side compare
Paste two versions of text, then compare them to see additions, removals, and changed lines.
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Diff Checker

A quick diff checker is useful any time you want to compare generated text, config changes, prompt revisions, or snippets copied from two environments. Instead of eyeballing two blocks manually, you can line them up and generate a readable before-versus-after summary.

This tool performs a line-level comparison in the browser and outputs a unified-style diff that is easy to copy into notes or bug reports.

How to Use the Diff Checker

  1. Paste the original text on the left and the updated text on the right.
  2. Run Compare to generate a line-level diff.
  3. Review additions and removals in the unified diff output.
  4. Copy the diff if you need to send the change summary to someone else.

Diff Checker Examples

Before 
server=api
retries=2
After 
 server=api
- retries=2
+ retries=3
+ timeout=5000

Frequently Asked Questions

  • Does this compare files or just pasted text?

    This page compares pasted text blocks directly in the browser.

  • What kind of diff does it generate?

    It produces a readable unified-style line diff with additions and removals.

  • Is the compared content private?

    Yes. The comparison runs locally and does not upload your text.

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