Compress PDF
Shrink your PDF file size by removing unnecessary metadata and optimizing internal structures. Great for email attachments and uploads. 100% client-side processing.
Other PDF Tools
About Compress PDF
Reduce your PDF file size online without losing quality. FastConvert's PDF Compressor removes unnecessary metadata, cleans internal structures, and optimizes your document for email attachments, uploads, and storage. It's 100% free, runs entirely in your browser, and requires no sign-up. Your files never leave your device.
Frequently Asked Questions
How do I compress a PDF without losing quality?
FastConvert's compressor removes redundant metadata, unused fonts, and bloated internal structures — without downsampling images or degrading text. You get a smaller file that looks identical to the original.
What's the difference between compressing and reducing PDF size?
They mean the same thing. 'Compress PDF' and 'reduce PDF file size' both refer to making the file smaller for email, upload, or storage. Our tool does this by optimizing the PDF's internal structure.
Is there a file-size limit for compression?
No hard limit. Since everything runs in your browser, the practical limit depends on your device's RAM. Most users can compress files up to several hundred MB without issues.
Can I compress a PDF on my phone without installing an app?
Yes. FastConvert works in any mobile browser — Safari, Chrome, Firefox. No app download, no sign-up, no watermark. Just open the page, drop your file, and download.
How much smaller will my PDF get?
Results vary by content. PDFs with embedded images and redundant metadata typically shrink 30–70%. Text-heavy documents with minimal images see smaller but still meaningful reductions.
Is this PDF compressor really free?
Yes, 100% free — unlimited files, no daily cap, no sign-up, no watermark. Unlike Smallpdf or iLovePDF, there's no paywall after your second file.