PDF Compressor
Reduce PDF file size without losing quality. Perfect for email attachments and uploads. Free, fast, and completely private.
Drop PDFs here or click to upload
Compress multiple PDFs at once — all processing in your browser
PDF Compressor runs 100% in your browser
Your files are never uploaded to any server. All processing happens locally on your device using modern browser technology. Private, fast, and free.
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How to Compress a PDF File Online
Open the PDF Compressor
Navigate to the tool page. No account or login required.
Upload your PDF
Drag and drop your PDF file or click to select it from your device.
Choose compression level
Select your preferred balance between file size and quality. Higher compression means smaller files with slightly reduced image quality.
Download compressed PDF
Save your compressed file. The tool shows you exactly how much space you saved.
Pro Tips
- •For email attachments, most providers have a 25MB limit. Compress PDFs to stay well under this threshold.
- •PDFs with lots of high-resolution images benefit most from compression — you can often reduce size by 60-80%.
- •Text-heavy PDFs are already small and may not compress significantly further.
- •The tool preserves text quality perfectly — only embedded images are compressed.
Who needs PDF Compressor?
Students
Academic work and assignments
Professionals
Business and office tasks
Creatives
Design and content creation
Everyone
Personal everyday tasks
When to Use PDF Compressor
Email attachments
Compress large PDFs to fit within email size limits (typically 25MB).
Website uploads
Reduce PDF size for faster downloads when hosting documents on your website.
Cloud storage
Save storage space by compressing PDFs before uploading to Google Drive, Dropbox, or OneDrive.
Form submissions
Many online forms have file size limits. Compress your PDFs to meet upload requirements.
Frequently Asked Questions
How much can I reduce my PDF size?
Typically 40-80% for PDFs with images. Text-heavy PDFs with few images may only compress by 10-20%.
Will compression affect text quality?
No. Text, fonts, and vector graphics remain perfectly crisp. Only embedded raster images are compressed.
Can I compress a PDF below a specific size?
The compression level slider lets you target different size-quality tradeoffs. Try different settings to hit your target size.
Is there a file size limit?
No strict limit since processing is local. Very large PDFs will take longer but will still work.
Common use cases for PDF Compressor
Tailored step-by-step guides for the most common ways people use pdf compressor.
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Compress PDF Under 100KB for Online Forms
Government forms, visa applications, and job portals often demand PDFs under 100KB. Here's how to hit that limit.
Compress PDF for WhatsApp (Under 100MB)
WhatsApp document limit is 100MB. Anything over and your PDF won't send. Here's the 30-second fix.
Compare PDF Compressor with alternatives
Honest head-to-head comparisons against Smallpdf, iLovePDF, Adobe, and other popular tools.
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PDF Compressor vs Alternatives
PDF compression tools are widely available, but privacy and quality vary significantly.
Adobe Acrobat Pro
Professional PDF compression
Key difference: Paid subscription required. Best compression quality but expensive.
Smallpdf
Online PDF compressor
Key difference: Uploads files to cloud. Free tier limited to 2 compressions per day.
iLovePDF
Web-based PDF compressor
Key difference: Files processed on remote servers. Shows ads on free tier.
Compress PDFs with zero file uploads. Your documents stay on your device the entire time. No daily limits, no ads, no watermarks.
Good to know
- All processing happens in your browser. Very large files may be slower on mobile devices or older computers.
- Results depend on the quality and format of your input. For best results, use high-quality source files.
- Once you close the browser tab, all data is gone. Make sure to download your results before closing.
Key Features
100% Free
No hidden fees, no premium tiers, no limits on how much you use it. Free today, free tomorrow, free forever.
Complete Privacy
Your files never leave your device. Everything is processed locally in your browser — we physically cannot access your data.
No Registration
Start using the tool immediately. No account, no email, no personal information required. Just open and use.
Works Everywhere
Compatible with Chrome, Firefox, Safari, and Edge on desktop and mobile. Works offline once the page has loaded.
Full Step-by-Step Guide
Detailed walkthrough with pro tips and best practices for getting the best results every time.
Read guideFrequently Asked Questions
Every common question answered — file limits, privacy, supported formats, compatibility, and more.
View FAQCompare Alternatives
See how PDF Compressor stacks up against Adobe, Smallpdf, and other paid and free alternatives.
Compare now