Compress PDF Online for Free
Reduce your PDF file size while maintaining quality. Fast, free, and secure.
Click to upload or drag and drop
PDF files up to 50 MB
How to Compress a PDF
Upload your PDF
Click the upload area or drag and drop your PDF file into the tool above.
Choose compression level
Pick Low for lossless quality, Recommended for a balanced result, or Maximum for the smallest file size.
Download your compressed file
Click the download button to save your smaller PDF. That's it — no signup needed.
Why Use Our PDF Compressor?
Your Privacy Matters
Basic compression stays in your browser — files never leave your device. Advanced presets use our secure servers, where files are automatically deleted after processing.
Instant Results
Basic compression runs instantly in your browser. Advanced presets use fast cloud processing — most PDFs are compressed in under 10 seconds either way.
Smart Compression
Our engine optimizes images, fonts, and internal structure — removing redundancy and streamlining storage. Choose how aggressively to compress based on your quality needs.
Free with No Catches
Compress up to 3 PDFs per day for free, with files up to 50 MB. No watermarks added to your documents, no account required, and no hidden limits on compression quality.
Common Uses for PDF Compression
PDF too large to email?
Shrink PDFs that are too large to email. Most email providers limit attachments to 25 MB — our compressor reduces file size by streamlining internal structure, helping many documents fit under the limit.
Save storage space
Save storage space on your device or cloud drive. Compressed PDFs take up less room without sacrificing readability.
Meet upload size limits
Meet file size requirements for job applications, government forms, university submissions, and other online portals that cap uploads at 5-10 MB.
Share files faster
Share smaller files faster over messaging apps, Slack, or file-sharing services. Smaller PDFs load quicker for recipients too.
Frequently Asked Questions
Is this PDF compressor free?
Yes, you can compress up to 3 PDFs per day for free without signing up. Need more? Grab a 24-hour unlimited day pass for $3.99 or go Pro for $12/mo.
Is it safe to compress PDFs online?
Yes. Basic compression runs entirely in your browser. Advanced presets upload your file to our secure servers for deeper optimization — files are automatically deleted after processing.
How much can I reduce my PDF size?
It depends on the PDF. Image-heavy documents (scans, photos) can shrink by 80-99%. Text-heavy PDFs with embedded fonts typically see 20-40% reduction. Already-optimized files may see smaller gains. Use the Recommended or Maximum preset for the best results.
Will compression affect the quality of my PDF?
The Low preset is lossless — it only optimizes internal structure, so your content stays pixel-for-pixel identical. Recommended and Maximum presets also recompress images for much greater size reduction, with quality carefully tuned so documents look great on screen and in print.
What is the maximum file size I can compress?
Free users can compress PDFs up to 50 MB. Pro users can compress files up to 2 GB. Basic compression runs in your browser; advanced presets are processed on our secure servers with automatic deletion.
Can I compress multiple PDFs at once?
Free users can compress one PDF at a time, up to 3 per day. Pro users get batch compression — upload multiple PDFs and compress them all in one go.
Does the compressor work on my phone?
Yes, our PDF compressor works on any modern browser — desktop, tablet, or phone. No app installation required. Just open the page, upload your PDF, and download the compressed version.
My PDF is too large to email. Can this help?
Yes — this is the most common reason people compress PDFs. Most email providers limit attachments to 25 MB. Our tool reduces file size by optimizing internal structure, which can be enough to get under the limit for many documents.