Compress PDF Online
Optimise the internal structure of your PDF and see exactly how many KB you saved. Files are processed privately on your device.
Free · No sign-up · Private — runs in your browser
Drop a file here or click to browse
PDF files only
How to use the PDF Compressor
- Upload the PDF you want to optimise.
- Choose a compression level.
- Click Compress and download the smaller file.
Why use this pdf compressor?
- Shows original vs. new size
- Runs locally — your document stays private
- Free, no watermark
Frequently asked questions
How much can a PDF be reduced?
Results depend on the file. PDFs with redundant structure shrink the most; PDFs made mostly of already-compressed photos may change little.
Is compressing a PDF safe for private files?
Yes. Compression happens in your browser and the file is never sent to our servers.
Why did my PDF barely get smaller?
If the PDF is mostly large photos, it is already compressed. Try compressing the original images first with our Image Compressor, then rebuild with JPG to PDF.