100% local processing
Your PDF never leaves your device. Compression runs in a browser worker with no server uploads.
Three quality tiers
Extreme, Recommended, and Print-Safe modes let you trade file size against visual fidelity.
No account required
Use the tool immediately with no registration, email, or sign-in.
Works offline-capable
After the page loads, compression can proceed without sending data over the network.
How it works
- 1
Upload your PDF
Drag and drop a PDF onto the compress tool or use Browse files to select one from your device.
- 2
Choose a compression level
Pick Extreme for the smallest file, Recommended for balanced quality, or Print-Safe to preserve print resolution.
- 3
Compress locally
Click Compress PDF. Processing runs entirely in your browser — the file is never uploaded to a server.
- 4
Download the result
When compression finishes, your reduced PDF downloads automatically. You can compress again or choose another file.
Common questions
Is my PDF uploaded to a server?
No. LocalPDF compresses PDFs entirely inside your browser. Your file is read from disk, processed locally, and never transmitted to our servers.
Which compression level should I use?
Recommended is the best default for most documents. Use Extreme when file size matters most and Print-Safe when you need higher image fidelity for printing.
Why did my file size increase after compression?
Some PDFs are already well optimized. Re-compressing them can add overhead, so LocalPDF returns the original when a smaller result is not possible.
Are password-protected PDFs supported?
Encrypted or password-protected PDFs cannot be compressed in the browser tool. Remove protection first, then compress the file.