Compare PDF
Compare two PDF files and highlight differences.
How to Use Compare PDF
- Upload your file: Drag and drop your file into the active processing area above, or click the box to browse your device files.
- Configure settings: Select your preferred options (such as target file size in KB, compression level, page order, or output format).
- Process locally: Click the primary action button. Your file is rendered and encoded in seconds directly inside your browser memory.
- Download output: Click Download to save the modified document back to your device. No watermarks are added.
Zero-Cloud Privacy Guarantee
Unlike legacy web utilities that upload your sensitive documents to remote servers, PDFtiny executes 100% of processing inside your local browser using WebAssembly. Your files never leave your computer, ensuring complete privacy, enterprise compliance, and offline availability.
Technical Specifications
| Parameter | Specification |
|---|---|
| Processing Engine | Client-Side WebAssembly (WASM) & HTML5 File API |
| Server Transmission | 0 Bytes Uploaded (100% Local Browser Memory) |
| Device Compatibility | Chrome, Safari, Firefox, Edge, Android, iOS, Windows, Mac, Linux |
| Compliance | ISO 32000-2:2020, GDPR Article 25 (Privacy by Design) |
Frequently Asked Questions
How does the PDF comparison tool highlight changes?
PDFtiny uses dual-layer comparison: visual raster pixel diffing and text stream diffing. Inserted text is highlighted in green, deleted sections in red, and layout shifts in blue.
Can I compare contracts with different page counts?
Yes, the engine synchronizes matching pages and flags inserted, omitted, or rearranged pages between document revisions.
Can I export a comparison report?
Yes, you can download a consolidated summary PDF showing side-by-side revision markups and a change log.
Are legal agreements safe to compare here?
Absolutely. Because processing is 100% client-side, sensitive contracts, NDAs, and corporate agreements remain strictly private on your device.