Reduce the file size of your PDF documents locally in your browser.
Frequently Asked Questions
Is Compress PDF free to use?
Yes. Compress PDF is 100% free on ALI Tools — no sign-up, no watermark, and no hidden charges. Use it as many times as you like.
How do I use Compress PDF?
Enter your input in the tool and click “Compress PDF”. Your result appears instantly on the same page.
What can I do with Compress PDF?
Compress PDF gives you one-click actions including “Compress PDF”, “New file”, so you can process, copy, or save your result without any extra software.
Do I need to install anything or create an account?
No. Compress PDF works directly in your browser on mobile, tablet, or desktop. There is nothing to install and no account to create.
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What does this tool do?
Upload your PDF files and process them instantly — merge, split, compress, convert, watermark and more without uploading to any server.
Key features
- 100% private — files never leave your device
- No file size limits for most tools
- High-quality output
- Works on all devices
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