Free PDF Compressor
Reduce PDF file size by up to 80% without quality loss. Compress large PDFs for email attachments, faster uploads, and reduced storage. 100% private — your files never leave your browser.
Compress PDF File
Drag & drop a PDF to reduce its size
Why Compress PDF Files?
Large PDF files create problems across business and personal workflows
Email Attachments
Most email services limit attachments to 10-25MB. Gmail: 25MB, Outlook: 20MB. Compress PDFs to fit within email restrictions.
Cloud Storage Savings
Cloud storage costs money. Google Drive: 15GB free, Dropbox: 2GB free. Compressing PDFs 60-80% can triple your storage capacity.
Faster Upload & Download
Large PDFs take minutes to upload. A 50MB PDF compressed to 10MB uploads 5× faster. Critical for form submissions with deadlines.
Website Performance
PDFs on websites affect load times and SEO. Compressed PDFs improve user experience and Core Web Vitals metrics.
Mobile Viewing
Mobile users have limited data. Large PDFs drain allowances and load slowly. Compressed PDFs load instantly on 4G/5G.
Form Submissions
Job applications, visa forms, government portals have strict limits (2-10MB). Compress to meet requirements.
How PDF Compression Works
Understanding visual compression and rasterization technology
PDF Analysis
Your browser reads the PDF using PDF.js. Each page is analyzed for images, fonts, and complexity.
Page Rasterization
Each page is rendered to canvas at optimized resolution. High quality: 200-300 DPI, Balanced: 150 DPI.
Image Compression
Rendered pages are compressed as JPEG with your chosen quality level, removing embedded high-res images.
PDF Rebuild
Compressed images are assembled into a new PDF using jsPDF. Downloads automatically when complete.
Compression Level Guide
🔥 Extreme Compression
Size Reduction: 80-90%
Low quality with visible artifacts. Best for documents you just need to read once, email attachments with strict limits.
⚖️ Recommended
Size Reduction: 60-75%
Good balance. Text readable, images decent. Best for standard emails, internal documents, everyday use.
💎 Less Compression
Size Reduction: 40-60%
High quality, minimal artifacts. Best for professional presentations, client documents, legal files.
Frequently Asked Questions
Is this PDF compressor really free?
Yes, completely free with no limits. Compress unlimited PDFs, no registration, no hidden costs.
Are my PDFs safe and private?
Absolutely. Your files never leave your device. All compression happens locally in your browser.
Will compression reduce PDF quality?
Yes, intentionally. Visual compression trades quality for size. 'Recommended' setting balances both well.
Can I search text after compression?
No. Visual compression converts pages to images. Text becomes non-searchable and non-selectable.
How much smaller will my PDF be?
Typical: Extreme: 80-90% smaller. Recommended: 60-75% smaller. Less: 40-60% smaller.
What's the maximum PDF size?
No artificial limit. Most computers handle PDFs up to 100-200MB. Processing ~1-2 seconds per page.