Compress PDF
Reduce PDF file size online for free. Choose a compression level and optimize your PDF directly in your browser.
Important PDF compression note
This browser-based compressor reduces file size by rendering PDF pages as optimized images. The visual appearance is preserved, but selectable text, hyperlinks, forms, annotations and some metadata may no longer remain interactive.
Private browser-based PDF compression
Your PDF is processed directly on your device. No account, database or permanent server storage is required for supported documents.
Compress PDF Online for Free
Reduce the size of PDF documents directly in your browser. ConvertTools provides adjustable compression levels so you can choose the right balance between visual quality and smaller file size.
PDF compression can be useful when you need to email a document, upload it to a website, save storage space or work with a file that exceeds an upload size limit.
Image-heavy and scanned PDF documents often benefit the most from this type of compression. PDFs that are already highly optimized may not become significantly smaller.
How to Compress a PDF
1. Select your PDF
Choose the PDF document you want to reduce in size.
2. Choose a compression level
Select Light, Recommended or Strong depending on the balance you want between file size and image quality.
3. Compress and download
Click Compress PDF. Your document will be processed in your browser and the compressed file will download automatically.
Why use our PDF compressor?
Adjustable Compression
Choose between multiple compression levels based on your needs.
File Size Comparison
See the original size, compressed size and percentage reduction.
No Signup
Compress PDF documents without creating an account.
Browser Processing
Supported PDFs are processed directly on your device.
Compress PDF FAQ
How do I compress a PDF online?
Select a PDF file, choose a compression level and click Compress PDF. The optimized file will be generated directly in your browser.
Is the PDF compressor free?
Yes. ConvertTools lets you compress PDF files online for free without creating an account.
What compression levels are available?
You can choose Light, Recommended or Strong compression depending on the balance you want between image quality and file size.
Are my PDF files uploaded to a server?
No. Supported PDF files are processed directly in your browser and do not need to be permanently stored on a conversion server.
Will compression change my PDF?
This browser-based compressor rasterizes PDF pages to optimized images. The visual appearance is retained, but selectable text, links, forms, annotations and some metadata may no longer remain interactive.