Compress PDF — Reduce PDF File Size Online
Reduce the size of a PDF so it's easy to email or upload without losing readability.
Compress PDF workspace
or drag and drop your PDF here
Files are processed securely in your browser and are never uploaded to our servers.
How to use Compress PDF
Just 3 simple steps to reduce your PDF file size quickly.
- 01→
Select your PDF
Upload the PDF you want to shrink.
- 02→
Choose compression
Choose light, balanced (recommended), or strong compression.
- 03
Download instantly
Click Compress PDF and download the smaller file instantly.
Why use MyPDF4U for Compress PDF?
No account, no software installation, and no waiting queues. Every tool opens directly to the upload area with zero watermarks and no file count restrictions. Your files are processed locally in client memory, keeping your documents confidential while delivering instant results.
Windows, Mac & Linux
Works in Chrome, Edge, Safari, and Firefox with no software download.
iPhone & Android
Mobile-first design lets you process files directly from photo galleries and Files.
Permanent Metadata
Rotations are written directly into the PDF specification, so it stays fixed forever.
100% Private & Free
Zero server uploads, no subscription walls, and no added watermarks.
Key features
Three tailored compression levels
Pick the exact balance between smallest file size and high visual fidelity.
Cuts up to 80% of file size
Massive savings on high-DPI scans, photos, and slide decks.
Confidential local compression
Optimization happens in your browser without transmitting files over the web.
Frequently asked questions
How do I compress a PDF under 25MB for Gmail or Outlook?
Upload your document to MyPDF4U's Compress PDF tool, select 'Balanced' compression, and click Compress. It resamples bulky scan images to under 25MB.
How much smaller will my PDF file become?
Scanned documents and image-heavy files usually drop by 50% to 80% in size. Text-only documents see smaller reductions.
Is the PDF compressor free with no file limit?
Yes. There are no daily conversion caps, no watermarks, and no sign-up requirements.
Good to know
PDF file bloat almost always comes from uncompressed 300+ DPI scan images. Intelligent downsampling to 150 DPI provides sharp viewing while cutting megabytes off your document.