PDF Compare (Visual Diff)
Visually compare two PDF pages to spot differences overlayed.
PDF A Upload
Select base document
PDF B Upload
Select compare document
✨ Convert
- Opacity slider
- Highlight changes
- Overlay mode
- Side-by-side mode
- Color difference filter
💡 Info
**Design Proofing** Perfect for checking revisions of a design.
**Visual Check** Spot moved pixels that text diffs miss.
🚀 Usage
- 1
Upload File A and File B.
- 2
Select pages to compare.
- 3
See the highlighted differences.
Overview
This tool is designed for fast, local processing with no server upload. It focuses on clarity and repeatable results.
When to use it
- • When you need a quick result without installing software.
- • When you must keep files on your device for privacy.
- • When you want a predictable output for reuse or sharing.
How it works
Your file is processed in the browser. The workflow is deterministic and optimized for common document patterns.
Best practices
- • Start with a small sample to confirm output expectations.
- • Keep file names simple to avoid OS-specific edge cases.
- • If results look off, try the tool again after a page refresh.
Common mistakes
- • Uploading encrypted or corrupted files without preparing them first.
- • Assuming a tool will fix formatting issues outside its scope.
- • Closing the tab before the download completes.
⚠️ Limits
- • Compares visual layout only
- • Must compare single pages
📥 Inputs & Outputs
Inputs
- PDF A & PDF B Formats: pdf
Outputs
- Diff View Formats: n/a
🔒 Privacy & Security
- • Comparison renders locally.
🛠 Troubleshooting
Files irrelevant?
Make sure page sizes match.
Misaligned?
Source files must be same dimensions.
Text only?
This is a visual comparator.
❓ FAQ
Can it compare text?
It compares visual pixels.
Free?
Yes.
Save report?
Screenshot the result.
Multi-page?
Compares one page pair at a time.
Privacy?
Local rendering.
Color blind mode?
Uses high contrast diff.