Compress PDF Online Free
Reduce PDF file size for email attachments, government portals, and exam uploads directly in your browser. Your documents stay on your device.
How to Reduce PDF File Size Without Uploading Confidential Documents
Many online portals, university admission forms, bank KYC uploads, and email servers enforce strict attachment size limits (such as 100 KB, 200 KB, 1 MB, or 2 MB). Our browser-based PDF compressor offers three distinct optimization modes so you can balance file size and visual sharpness:
- Recommended Compression: Downsamples high-resolution scanned pages and embedded images to 72% JPEG quality at standard reading resolution—ideal for scanned certificates, invoices, and multi-page reports.
- Extreme Compression: Maximizes KB reduction (52% JPEG quality at 1.0x viewport) for strict upload portals where meeting the file size cap is the top priority.
- Light Optimization (Lossless): Preserves selectable vector text while stripping hidden document metadata and repacking PDF object streams.
Frequently Asked Questions
Are my PDF documents uploaded to a remote server?
No. Compression happens inside your web browser using PDF.js and pdf-lib. Your files remain on your device.
Which mode should I choose for a scanned PDF?
Choose Recommended Compression or Extreme Compression. Scanned PDFs contain large page images that shrink significantly when re-encoded at optimized JPEG quality.
Will Extreme or Recommended mode rasterize selectable text?
Yes. Recommended and Extreme modes render pages as compressed images to achieve maximum size reduction. If you must keep selectable text intact, select Light Optimization.