Compress PDF
Reduce PDF file size while optimizing quality.
How to Use Compress 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 much can PDFtiny compress a PDF?
Compression ratio depends on the original content. Scanned document PDFs (image-heavy) typically compress by 70–90%. PDFs with native vector text and minimal images compress by 20–50%. The
Can I compress a PDF to exactly 100KB or 200KB?
Yes. Switch to
Why is my compressed PDF larger than the original?
This can happen with PDFs that already contain highly optimized content, such as native vector text with no embedded images. In that case, the image re-encoding step can slightly increase size. Try a lower compression level or use the
Does compressing a PDF reduce text quality?
At Medium or Low compression levels, text quality is preserved because PDFtiny only re-encodes embedded images. At Maximum compression, images are scaled down more aggressively, which may soften some complex diagrams.