Compress PDF Files Securely
Reduce PDF file size online for free directly in your browser. No upload, no signup, no watermark — your file never leaves your device. Optimize for email and web.
Click to upload or drag and drop
Only PDF files are supported. All processing happens in your browser.
Performance Note: All processing happens locally in your browser to maintain 100% privacy.
Compress PDF Files Securely
Large PDFs are a pain — they bounce out of email attachments, lag on mobile, and chew up cloud storage quotas. PDFGami's compressor reduces PDF file size by optimizing internal object streams and image data, all without uploading your document. Useful for getting a PDF under a 25 MB email limit, shrinking scanned documents, or trimming an image-heavy report before publishing it on the web.
Privacy Guaranteed
Compression happens locally via pdf-lib. Your documents are never uploaded to a server.
Smart Compression
Optimizes file size while maintaining readability. Image-heavy PDFs typically shrink 40–70%.
No Registration
Compress your files immediately, for free, no account, no watermark on the output.
No Size Limit
Browser-based processing means no server upload cap — compress files of any size your device can handle.
!How to Merge PDFs Locally
Drop the large PDF file into the compressor.
The local engine analyzes object streams and image data.
Compression runs in your browser — no upload, no waiting in a queue.
Review the new file size and download your compressed PDF.
Local vs. Server Merging
| Feature | Local (Us) | Cloud Merger |
|---|---|---|
| Privacy | Absolute (no upload) | Files stored on vendor servers |
| File size limit | Unlimited (device memory) | Often 25–50 MB on free tier |
| Watermark | Never | Common on free PDF compressors |
| Speed | Instant (no upload wait) | Upload + queue + download |