Compress PDF Files Online
Reduce your PDF file size by up to 80% while maintaining readability. Perfect for email attachments, web uploads, and storage savings. Free, fast, and no watermarks.
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Auto Deleted
Files removed in 2 hours
Lightning Fast
Process in under 5 seconds
Private & Safe
We never read your files
Works Anywhere
Any browser, any device
No Waiting
Instant download ready
Select a PDF to compress
Drag and drop or click to browse
Choose PDF FileMax 100MB · Files deleted after 2 hours
Compression Level
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How to Compress a PDF File — Complete Guide
Upload your PDF
Select or drag your PDF file into the upload area. PDFly supports files up to 100MB for free users.
Choose compression level
Pick Low for best quality, Recommended for balance, or Max Compression for the smallest possible file size.
Download compressed file
Click "Compress PDF Now" and download your reduced-size PDF instantly. See exactly how much space you saved.
PDFly's PDF compressor uses advanced lossless and lossy compression algorithms to reduce your PDF file size while preserving readability. Whether you need to shrink a PDF to email it, upload it to a web form with a size limit, or save storage space, PDFly handles it in seconds.
Our compressor works on scanned PDFs, image-heavy documents, presentations, and text-based reports. Unlike many online tools, PDFly never adds watermarks or degrades your document's text quality — only image resolution is reduced at higher compression levels.
Frequently Asked Questions
Everything you need to know about merging PDFs with PDFly