Compress PDF Free Online
Reduce your PDF file size by up to 90% without losing quality. 100% secure local processing.
Fast Local Loading
Initializing WebAssembly Engine...
Why choose
FreeConversion?
ISO 27001 Ready
Secure local processing
GDPR Compliant
Privacy by design
WASM Powered
Native browser speed
No Cloud Storage
Zero data retention
FCFreeConversion vs others cloud tools
for every need
Compress your PDFs for email, web, print, or sharing.
Compress PDF for Email
Compress your PDF for email. Stay within Gmail 25MB, Outlook 20MB limits. Fast sending, instant deli...
Compress PDF for Print
Compress your PDFs for printing without quality loss. High resolution preserved, accurate colors, sh...
Compress PDF for Parcoursup
PDF too heavy for Parcoursup? Reduce your CV and cover letter size instantly. 100% free and complian...
Optimize PDF for Web
Optimize your PDFs for the web and improve your SEO. 10x faster loading, better Google ranking, opti...
Compress PDF for WhatsApp
Send your PDFs faster on WhatsApp. Reduce weight without losing readability. Save your mobile data. ...
Compress PDF without Quality Loss
Reduce your PDF files size while keeping perfect sharpness for text and HD images. Ideal for portfol...
Reduce PDF Size for Upload
Reduce your PDFs by up to 90% for fast upload. Perfect for Google Drive, Dropbox, OneDrive. Save tim...
Compress a PDF CV for France Travail (Pole Emploi)
Your CV is too large to be uploaded to France Travail? Reduce its size instantly to apply for jobs w...
Compress PDF assignments for Moodle
Can't submit your assignment because it exceeds the Moodle size limit? Compress your heavy PDF repor...
Compress PDF for Parcoursup
Reduce the file size of your documents for Parcoursup. Respect the strict 2MB limit imposed by the p...
Compress PDF for US Visa Application (Under 2MB)
The US CEAC portal strictly limits PDF uploads for passports and documents to 2MB. Reduce your file ...
Reduce a PDF document for WhatsApp sharing
WhatsApp can struggle or slow down with massive files on cellular data. Compress your PDF to send it...
Popular applications
Best Alternatives
WebAssembly (WASM)
We use cutting-edge WebAssembly technology to run professional-grade compression libraries directly in your browser. This means native speed without server lag.
Privacy First
Your files never touch our servers. All processing happens on your machine. This is the highest level of security possible for PDF handling.
Offline Ready
Once the page is loaded, you can compress files even without an internet connection. FreeConversion is a true web application, not just a website.
The Tech Behind the Speed
Unlike traditional online PDF compressors, FreeConversion uses WebAssembly (WASM) to run C++ compression algorithms directly in your browser. This means zero latency, no uploads to remote servers, and total privacy for your sensitive documents. Whether you need to reduce a PDF for email, upload to governmental portals, or optimize web storage, our local processing ensures maximum efficiency.
Frequently Asked Questions
Everything you need to know about local PDF compression.
Is this PDF compressor free?
Yes, our PDF compressor is completely free. No hidden fees, no registration required, and no file size limits.
Are my files private?
Yes, your files never leave your browser. All compression happens locally on your device. We never upload or store your files.
How much can I compress my PDF?
Results vary by content. Image-heavy PDFs can be reduced 50-80%. Text-heavy PDFs typically see 10-30% reduction.
Does it work on mobile?
Yes, our compressor works on all devices including iPhone, Android, iPad, and tablets. No app needed.
How to compress a PDF
1. Select your PDF file
Drag and drop or click to choose any PDF.
2. Choose the compression level
Lossless, optimal, or maximum.
3. Download your reduced PDF
The compressed file is ready instantly.