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Compress PDF
Shrink your PDF's file size — great for scans and image-heavy documents. Nothing is uploaded, your file never leaves this browser tab.
Drag & drop your PDF here
or click to browse — up to 50MB
How to Compress a PDF Online for Free
01
Select or Drop PDF
Choose any PDF document from your computer, tablet, or phone.
02
Pick Compression Level
Choose High (best quality), Balanced (recommended), or Low (smallest size).
03
Download Instantly
Get your optimized PDF immediately without waitlists, watermarks, or sign-ups.
How Client-Side PDF Compression Works
Unlike traditional PDF converters that transmit your private files over the internet to remote cloud servers, Daliy.Tools performs all rendering and compression operations directly inside your web browser using modern WebAssembly and HTML5 Canvas technology.
Each page is analyzed and reconstructed into high-efficiency, compressed raster layers. This eliminates bloated embedded metadata, uncompressed color profiles, and oversized scanned images while preserving clean, legible text for email attachments, government portals, and web publishing.
Frequently Asked Questions
Will compressing my PDF reduce text quality?
Our Balanced preset keeps text crisp while reducing large image sizes. If you are printing your document or need maximum sharpness, choose the High quality setting.
Is my PDF uploaded to any server?
Never. All processing happens entirely inside your local web browser. Your confidential files, contracts, or tax documents never leave your computer or phone.
What is the maximum file size supported?
You can compress PDFs up to 50MB directly in your browser. For optimal performance, modern browsers handle multi-page documents seamlessly within seconds.
Can I compress password-protected PDF files?
If your PDF is encrypted with a password, please unlock it before dropping it here so the browser can read and compress its pages.
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