Compress PDF
Reduce your PDF file size by re-compressing embedded images. Choose your compression level and download instantly. Files never leave your device.
Drag & drop a PDF file here
or click to browse
🔒 Your files never leave your device. Processing happens 100% in your browser.
How to Compress a PDF Online
- Upload your PDF by clicking Select PDF File or dragging it in.
- Choose a compression level — Low, Medium, or High.
- Click Compress PDF and wait while images are re-encoded.
- Download your compressed PDF and see the file size reduction.
How does browser-based compression work?
This tool uses PDF.js to extract each page as an image, re-encodes them at a lower JPEG quality using the browser's Canvas API, then rebuilds the PDF with pdf-lib. This achieves significant size reduction — especially for PDFs with many images or scanned documents.
Which compression level should I use?
Low compression gives the smallest file with some quality loss — good for emailing or sharing quickly. Medium is the best balance between size and quality for most uses. High keeps near-original quality while still reducing size by removing redundant metadata.
About Compress PDF
Compress and reduce PDF file size online for free. Choose compression level and shrink your PDF without losing quality. No sign-up required.
This Compress PDF runs entirely in your browser, so files and data stay on your device.
WebToolsDen is designed for fast, private processing with no account required. You can complete this task instantly from any modern browser.
How to use Compress PDF
- Add your file or paste your input.
- Adjust settings if available.
- Click the action button to process.
- Download or copy the result.
No uploads, no queues - just quick results with your Compress PDF task.
Why use WebToolsDen for Compress PDF?
- Private: processing happens locally in your browser.
- Fast: no file uploads or waiting on servers.
- Free: no accounts or subscriptions required.
- Simple: clear UI and results in one click.
Common ways to use Compress PDF
- Shrink large PDFs to meet email or upload limits.
- Speed up website downloads and improve page load times.
- Store more documents without sacrificing readability.
Compress PDF tips and best practices
- Use Medium compression for the best balance of quality and size.
- Best results on scanned PDFs or image-heavy documents.
- If text looks blurry, choose a higher quality level.
Compress PDF FAQ
Is this Compress PDF free to use?
Yes. WebToolsDen tools are free to use with no signup required.
Are my files uploaded to your servers?
No. Processing runs in your browser so files stay on your device.
Will it work on mobile devices?
Yes. The tools work on modern browsers on desktop and mobile.
How fast is the result?
Most tasks finish in seconds, depending on file size.
Will this change my original file?
No. Your original file remains untouched. The tool creates a new file.