Compress PDF Files Online
Reduce PDF file size by up to 90% while maintaining quality. 100% free, no upload required, completely private.
Select PDF files
or drop files here
Maximum file size: 100MB per file
High Quality
Maintain image quality while reducing file size up to 80%.
100% Secure
All processing happens in your browser. Your files never leave your device.
Super Fast
Compress multiple images in seconds with our optimized algorithms.
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About PDF Compression Technology
PDF (Portable Document Format) is the universal standard for document exchange, developed by Adobe. Large PDF files often contain high-resolution images, embedded fonts, and redundant metadata that bloat file size. Our advanced PDF compression algorithm uses lossy and lossless techniques to optimize images, downsample graphics, and remove unnecessary elements while maintaining document integrity. The compression process happens entirely in your browser using WebAssembly and PDF.js, ensuring your sensitive documents never leave your device.
How to Compress PDF Images
Select PDF Files
Click the upload button or drag and drop your images into the upload area. You can select multiple files at once.
Compress Images
Click the "Compress All Images" button. Our tool will process each image and show you the compression results in real-time.
Download Compressed Files
Download your compressed files individually or all at once as a ZIP archive. Your original files remain unchanged.
Frequently Asked Questions
Is PDF compression lossless?
Our tool uses advanced compression techniques that can be either lossless or near-lossless. While we optimize file size, the visual quality is preserved to ensure your images look identical to the originals.
Are my files safe and private?
Absolutely! All compression happens locally in your browser. Your files are never uploaded to our servers or transmitted over the internet. This ensures complete privacy and security for your images.
What's the maximum file size?
You can compress files up to 50MB each. For larger files, consider compressing them in smaller batches or using a different format.
How much can I reduce file size?
Compression results vary depending on the image content. Typically, you can expect 30-80% file size reduction. Images with large areas of solid colors compress better than complex photographic images.
When to Compress PDF Files
Email Attachments
Reduce PDF size to meet email attachment limits (usually 25MB)
Website Downloads
Speed up PDF downloads on your website for better SEO
Cloud Storage
Save storage space on Google Drive, Dropbox, or OneDrive
Document Archiving
Reduce storage costs for large document collections