How much will my file be compressed?

Typically 20–80% depending on the content. Image-heavy PDFs compress the most.

Will compression reduce image quality?

Slightly. Our default setting balances file size and visual quality. Premium users can choose quality levels.

Compress PDF

Shrink large PDFs without noticeable quality loss. Perfect for email attachments.

Compress PDF files online to make them easier to upload, email, and share. Reduce file size fast without making the document unusable.

Free online toolFree to startMac, Windows, iPhone, AndroidFiles deleted after processing

Drop a file here

PDF · Free: up to 25 MB

Accepted input formats

PDF

Output format: PDF

🔒 Encrypted transfer🗑️ Temporary processing🧹 Automatic deletion

How to Compress PDF

Upload

Click "Browse files" or drag your file into the box above.

Process

Hit the "Compress PDF →" button. We'll handle the rest in seconds.

Download

Your file is ready immediately. Download it — then it's deleted from our servers.

Why use Compress PDF online?

Compress PDF files online to make them easier to upload, email, and share. Reduce file size fast without making the document unusable.

Shrink PDFs for email attachments and forms portals
Balance file size with visual quality
Speed up sharing and uploads
Especially useful for image-heavy PDFs

Common use cases

Send PDFs under email attachment limits
Upload files to forms with strict size caps
Reduce large scans before archiving
Make documents faster to download on mobile

The ultimate solution for PDF processing

🔒

100% Safe & Secure

All uploads use SSL encryption. Files are stored temporarily and deleted automatically after processing.

⚡

Fast & Easy

🎯

High Quality

Formatting, fonts, images and layout are faithfully preserved across all operations.

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No Install Needed

Fully browser-based. No software downloads, no browser extensions, no desktop app required.

Frequently Asked Questions

Helpful guides

Extra context for people comparing tools, fixing edge cases, or learning the fastest workflow.

All guides →

How-to guide

How to Compress a PDF for Email

Reduce PDF file size for email attachments without making the document unreadable. Learn when and how to compress PDFs the right way.

How-to guide

Why You Should Compress PDFs Before Uploading Them Anywhere

Compressing a PDF before uploading reduces file size and limits metadata exposure. A smart habit that protects your documents and speeds up every upload.