What is PDF Compressor?
A Free Online PDF Compressor reduces PDF file size by up to 90% without losing quality. Compress large PDFs for email attachments (Gmail 25MB limit), faster uploads, cloud storage savings, and faster downloads. Our PDF compression removes unnecessary metadata, optimizes images within PDFs, and applies efficient encoding. Perfect for students submitting assignments, professionals sharing reports, and businesses sending proposals. No watermark, unlimited compressions, 100% free!
Formula
PDF Compression Methods:
1. Image Optimization: Reduce image quality within PDF (72-150 DPI)
2. Font Embedding: Remove embedded font duplicates
3. Remove Metadata: Strip author, comments, revision history
4. Downsampling: Convert high-res images to web-optimized
Compression Levels: Extreme (90%), Recommended (70%), Low (40%)
Benefits of Using PDF Compressor
Reduce PDF Size – Compress PDFs by 50-90% instantly
Email Friendly – Fit files within Gmail/Outlook 25MB limit
Fast Uploads – Upload compressed PDFs 10x faster
Save Storage – Reduce cloud storage costs significantly
No Quality Loss – Smart compression maintains readability
100% Secure – Files processed locally, auto-deleted after download
Pro Tip: For email: Compress PDFs to <5MB (Gmail limit 25MB but slow if >5MB). For printing: Use 'Low' compression (300 DPI). For screen viewing: Use 'Extreme' (72-150 DPI). Scanned PDFs compress more than text PDFs!
Frequently Asked Questions
Use our free tool: Upload PDF → Choose compression level (Extreme/Recommended/Low) → Download compressed file. Extreme: 90% reduction (72 DPI images). Recommended: 70% (150 DPI). Low: 40% (300 DPI for printing). Average 10MB PDF becomes 2-3MB!
Gmail limit: 25MB per email (all attachments combined). But emails >10MB are slow to send/receive. Best practice: Compress PDFs to <5MB. For larger files, use Google Drive link sharing (up to 15GB free storage)!
Our tool: YES - PDFs processed in your browser, not uploaded to servers. Files auto-deleted after compression. For confidential documents: Use offline tools (Adobe Acrobat, Preview on Mac). For public PDFs, online compression is perfectly safe!
Scanned PDFs are images, not text! 1 page scan at 300 DPI = 1-2MB. 100-page PDF = 100-200MB! Solution: Scan at 150 DPI (sufficient for reading), use OCR to convert to text, compress using our tool. 200MB → 20MB easily!
Extreme (90% reduction): 72 DPI, best for screen viewing, emails. Recommended (70%): 150 DPI, balanced for eBooks, reports. Low (40%): 300 DPI, if you plan to print. For 99% cases (digital use), Extreme works perfectly!
Slightly, but unnoticeable for screen viewing! Text PDFs: Minimal loss. Image-heavy PDFs: Some image quality reduction. If original PDF has 1200 DPI scans, 150 DPI is more than enough for reading. Print quality needs 300 DPI minimum.