Works on iPhone, Android, Windows, Mac · Multiple files supported
Large PDF files are painful to email, upload, or share — especially scanned documents and image-heavy reports. Our Free Online PDF Compressor shrinks your PDF file size directly inside your browser using HTML5 Canvas rendering, with 100% privacy and zero server uploads. It works identically on iPhone Safari, Android Chrome, Windows Edge/Chrome, and macOS — no app install required.
Unlike native desktop apps, our compressor runs entirely inside your web browser. It uses memory-safe canvas rendering with capped resolution to avoid crashing memory-constrained mobile browsers, so it works reliably whether you're on an iPhone, iPad, Android phone, Windows PC, or Mac.
Your PDF files never leave your device. All rendering and compression happens locally using your browser's own processing power — ensuring absolute confidentiality for sensitive contracts, invoices, and personal documents.
Upload multiple PDFs at once, compress them all with a single click, and download each file individually or all together — complete with a live before/after size comparison.
Compression re-renders each page as an optimized image, so a small amount of quality loss is expected — especially at the “Extreme” setting. The “Low Compression” level keeps pages visually sharp while still reducing file size.
Yes. The compressor is built with mobile Safari's memory limits in mind, capping render resolution and releasing canvas memory between pages so it runs reliably on iOS devices.
No. All rendering and compression takes place strictly on your local device using your browser. Nothing is uploaded anywhere.
There is no hard-coded limit, but very large PDFs (hundreds of pages or extremely high-resolution scans) may take longer to process or use more memory depending on your device's capability.
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