Compress PDF - quick, online, free (2025)

1. Click in the file selection box at the top of the page and select the files to compress.
2. Change the compression parameters if you want. Start the compression with the corresponding button.
3. Finally, save the compressed files.

When reducing the file size of a PDF, various methods are used to make the file smaller. Depending on what data is contained in the PDF, the compression works well or less well. PDF files with e.g. images can be compressed well. PDF24 uses the following techniques to compress a PDF:

1. Removal of font information that's not required for displaying the PDF.
2. Reduction of the image size depending on the DPI parameter.
3. Reduction of the image quality depending on the image quality parameter.
4. PDF file changes and data compression of a structural nature.

Lossless PDF compression is possible with PDF24, but you can't expect a big reduction in file size in this mode. That's how it works:

1. Click in the file selection box at the top of the page and select the files to compress.
2. Change the compression mode to lossless compression and start compression with the corresponding button.
3. Finally, save the compressed files.

PDF24 takes the protection of files and data very seriously. We want our users to be able to trust us. Security aspects are therefore a permanent part of our work.

1. All file transfers are encrypted.
2. All files are automatically deleted from the processing server within one hour after processing.
3. We do not store files and do not evaluate them. Files will only be used for the intended purpose.
4. PDF24 is operated by a German company, Geek Software GmbH. All processing servers are located in data centres within the EU.
5. Alternatively, you can get a desktop version of the PDF24 tools with the PDF24 Creator. All files remain on your computer here, as this software works offline.

Yes, you can use PDF24 Tools on any system with which you have access to the Internet. Open PDF24 Tools in a web browser such as Chrome and use the tools directly in the web browser. You do not need to install any other software.

You can also install PDF24 as an app on your smartphone. To do so, open the PDF24 Tools in Chrome on your smartphone. Then click on the "Install" icon in the upper right corner of the address bar or add PDF24 to your start screen via the Chrome menu.