PDFMaxCompress PDF - Reduce File Size for Free
Need to email a PDF, upload it to a portal, or just save space? PDFMax shrinks your PDF file size for free - no account, no app to install. The clever part: compression runs entirely inside your browser using Ghostscript, so your document never leaves your device or gets uploaded to a server. That makes it a safe choice for contracts, IDs, and anything confidential. Drop in a file, let it process locally, and download a smaller PDF in seconds. It works the same on phones, tablets, and computers, in any modern browser.
Compress PDF →100% freeNo signupWorks in your browser
Why PDFMax
- Free with no signup, no installation and no watermarks
- Compresses locally in your browser - the file is never uploaded, keeping confidential documents private
- Smaller PDFs that are easy to email or attach within size limits
- Works on mobile and desktop in any modern browser
How to compress pdf
- Open the Compress PDF toolGo to the Compress PDF tool on PDFMax - no login or download required.
- Add your PDFDrag and drop your file or tap to select it. It loads straight into your browser, not onto a server.
- Compress the fileStart compression. Ghostscript reduces image resolution and strips redundant data on your device to shrink the file.
- Download the smaller PDFSave the compressed PDF to your phone or computer when it's ready.
Frequently asked questions
Is the PDF compressor free?
Yes, completely free. There's no signup, no subscription, no installation and no watermarks added to your file.
Is it safe and private? Is my file uploaded?
Compression runs entirely in your browser using Ghostscript, so your PDF is never uploaded to a server. The file stays on your device, which makes it safe for contracts, IDs and other confidential documents.
Will compressing reduce the quality of my PDF?
Compression mainly lowers the resolution of images, which is where most of the size lives, so heavy compression can soften photos. Text and vector graphics stay sharp and readable. PDFs with lots of images shrink the most.
Is there a file size limit?
There's no fixed server limit because processing happens locally. The practical limit depends on your device's memory, so very large files take longer on older phones.
Does it work on my phone?
Yes. It runs in any modern browser on Android, iPhone, iPad, and desktop - no app to install.
Why compress a PDF?
A smaller file is easier to email, fits within upload size limits on websites and forms, and uses less storage. Compression is the quickest way to get a large PDF under a size cap.