Compress PDF

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.

A large PDF file can be created if the PDF file contains images. This is usually the main reason for a PDF that is too large. A PDF file that contains only text is usually much smaller. If a PDF contains images, you can use PDF24 to make them very small by reducing the size and quality of the images.

The PDF24 compression tool has several modes. In normal compression mode, the quality and size of the images are reduced, as this has the greatest effect on the file size. Lossless compression can also be used, but has less impact. However, a reduction in quality is often not a problem. The question is more or less how much the quality can be reduced, which is still acceptable in terms of file size.

Yes, if the PDF contains images, because these images can be further compressed and the image size can be reduced. PDF compression for PDF files without images works less well.

Simply download the free and easy to use PDF24 Creator and install it. This software is an offline PDF solution that includes a PDF compression tool that is easy to use.

PDFs usually use internal compression for the objects they contain. However, this compression is not absolutely necessary. All or only some objects can be contained completely uncompressed. The software that creates the PDF can decide whether to compress objects or not. The PDF standard does not require PDF compression.

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.

Yes, Windows users can also use PDF24 offline, i.e. without an Internet connection. Simply download the free PDF24 Creator and install the software. The PDF24 Creator brings all PDF24 tools to your PC as a desktop application. Users of other operating systems should continue to use PDF24 Tools.