Compress PDF Online
Processing entirely on your device — large files may take a moment.
Large PDF files slow down websites, eat mail attachment limits and fill up storage. This compressor reduces PDF size by re-encoding with a quality level you control — photos typically shrink by 30–80% at a visual difference most people never notice.
Compression runs entirely on your device with WebAssembly — your files are never uploaded, and there are no watermarks, queues or daily limits. The quality slider trades fidelity for file size: drag it lower for the smallest result, higher to preserve detail, and batch-drop as many files as you like.
How to convert PDF to PDF
- 1
Select your files
Drag & drop your PDF files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Compress" and pick a quality level — lower quality means a smaller file. Everything runs inside your browser; nothing is uploaded.
- 3
Download results
Download each converted PDF file individually, or grab everything at once as a ZIP archive.
Frequently asked questions
Is this compressor really free?
Yes — completely free with no sign-up, no watermark and no daily limits. The site is supported by advertising.
Are my files uploaded to a server?
No. Compression runs entirely inside your browser using WebAssembly, so your files never leave your device.
Can I compress multiple files at once?
Yes — drag in as many files as you like and they are compressed in one batch. When more than one file comes out, you can download everything as a ZIP.