1. Select your PDF
Choose a file from your computer or drag & drop it into the area above.
Compress PDF Online — Free & Private
Reduce your PDF file size instantly, right in your browser. 100% in your browser, no uploads. Your sensitive documents never leave your device.
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Drop your PDF here or click to select
Your file stays on your device. Nothing is uploaded.
Compressing your PDF...
How it works
2. Automatic compression
The tool re-renders and re-encodes each page with optimized settings to shrink your file size.
3. Download
Get your smaller PDF file instantly. No waiting, no email required.
Why compress PDF files?
Large PDF files are a common frustration. They clog email inboxes, slow down cloud storage sync, and make sharing documents over messaging apps nearly impossible. A PDF compressor solves this by reducing file size, although pages can become slightly less sharp.
What makes this tool different from services like iLovePDF or Smallpdf? Privacy. Those platforms require you to upload your documents to their servers — which means your contracts, invoices, medical records, or tax returns pass through third-party infrastructure. Our compressor works 100% in your browser, no uploads, so your PDF never touches a server. It's faster too, since there's no upload or download time.
When should you compress a PDF?
Here are the most common scenarios where reducing PDF size is essential:
- Email attachments — Most email providers limit attachments to 25 MB. Compressing large PDFs ensures they go through.
- Web uploads — Government portals, university applications, and job boards often enforce strict file size limits.
- Cloud storage — Smaller PDFs mean less storage consumed and faster sync across devices.
- Faster loading — If you embed PDFs on a website, lighter files improve page speed and SEO.
Frequently asked questions
How does this PDF compressor reduce file size?
The tool renders each page of your PDF and re-encodes the content as optimized JPEG images inside a new PDF. This dramatically reduces file size, especially for scanned documents and image-heavy PDFs.
Is my PDF uploaded to a server?
No. Unlike most online PDF compressors, this tool processes your file 100% in your web browser. Your document never leaves your device, making it the safest way to compress sensitive PDFs like contracts, tax forms, or medical records.
Will compressing reduce the quality of my PDF?
It can. The tool compares an image-based version of your PDF (each page rendered at 144 DPI and saved as JPEG) with an optimized copy of the original, and keeps the smaller one. If the image-based version wins, pages may look slightly less sharp when zoomed in, and the text can no longer be selected or searched. If you need to copy the text later, keep the original too. If neither version is smaller, you get your original file back.
Is this free?
Yes, 100% free with no limits, no watermarks, and no account required. Compress as many PDFs as you need.
What's the maximum file size I can compress?
Since processing happens on your device, the limit depends on your computer's available memory. Most devices can handle files up to 100 MB without issues.