Compress PDF
Reduce PDF file size so it fits email and upload limits. Choose between lossless optimization and stronger compression.
- ✓ Free
- ✓ No sign-up
- ✓ No upload
Drag a file here or choose one
Accepted: PDF · Max 200 MB per file · up to 5 files at once
Every conversion runs inside your browser.Files are never uploaded to or stored on a server.
How to use Compress PDF
- 1Choose or drop your PDF files.
- 2Adjust the settings if you like — the defaults work for most files.
- 3Click Convert.
- 4Download the result. Your files stay on your device the whole time.
Compress PDF: tool facts
| Accepted files | |
|---|---|
| Output | Same format as the input |
| Max file size | 200 MB |
| Files at once | 5 |
| Where files are processed | In your browser — files are never uploaded |
| Conversion engine | pdf-lib (lossless) or pdf.js (strong) |
| Price | Free, no sign-up |
PDF at a glance
| Full name | Portable Document Format |
|---|---|
| Developed by | Adobe (ISO 32000 since 2008) |
| First released | 1993 |
| File extensions | |
| MIME type | application/pdf |
| Compression | Lossy or lossless |
Facts checked on 2026-10-10.
Frequently asked questions
What is PDF?
PDF is the standard format for sharing documents. It looks the same on every device and is required by most forms, contracts and print shops.
Will I lose quality?
Basic compression keeps the document exactly as it is. Strong and Extreme rebuild pages as images, which shrinks scanned documents a lot but makes text unselectable.
Is it safe to convert my files here?
Yes. The conversion runs inside your browser, so your files are never uploaded to a server. Close the tab and nothing remains.
Are there any limits?
It's free with no sign-up. Each file can be up to 200 MB, and you can convert up to 5 files at once.