Diff Checker
Compare text, JSON, or images side by side with highlighted differences — no size limit. Free, instant, and completely private.
No Size Limit
Unlike Diffchecker.com which limits free users to 1MB, there's no size limit here. Compare files of any size, entirely in your browser.
Text, JSON & Images
Unified or side-by-side view for text and JSON diffs. Visual comparison for images. All client-side, no data retention.
Frequently Asked Questions
Drop your text, JSON, or images into the Toolsz Diff Checker to immediately see a highly visual side-by-side comparison. Diffchecker.com requires paid tiers for larger files or constant usage, whereas Toolsz gives you unrestricted line-by-line checks for free — no signup, no premium.
Toolsz runs local comparison algorithms inside your browser. This means that proprietary source code or private configuration files can be compared locally without the severe security risk of uploading them to a third-party server like diffchecker.com.
How to Use This Tool
- 1
Paste Original Code
Insert the original text into the left pane
- 2
Paste Changed Code
Insert the modified text into the right pane
- 3
Analyze Differences
Look for the red (removed) and green (added) code blocks