Compress PDF

PDF compressor to reduce the size of PDF files

Free No limits Secure
Choose files
Compresses all selected PDF files
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4.9 (2340 votes)
How it works
  1. Select files to compress using the file selection box.
  2. If necessary, adjust the settings such as DPI and image quality. Start compression afterwards.
  3. Finally, save compressed PDF files.
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How to compress PDF files

Select your PDF files which you would like to compress or drop them into the file box and start the compression. A few seconds later you can download your compressed PDF files.

Adjustable quality

You can adjust the compression quality so that you can tune the compression algorithm in order to get a perfect result. PDF files with images can be compressed better than PDF files with text only.

Easy to use

PDF24 makes it as easy and fast as possible for you to compress your files. You don't need to install any software, you only have to select your files and start the compression.

Runs on your system

The compression tool does not need any special system in order to compress your PDF files. The app is browser based and works under all operating systems.

No installation required

You do not need to download and install any software. PDF files are compressed in the cloud on our servers. The app does not consume your system resources.

Secure online compression

The compression tool does not keep your files longer than necessary on our server. Your files and results will be deleted from our server after a short period of time.

Stefan Ziegler Developed by Stefan Ziegler
What others are saying
PDF files with images are often very large, too large to be sent by email. With this tool here I can often reduce the size of the PDF files considerably.
A really simple and cool tool to compress PDF files. With this, I usually still get my PDF files a little smaller without any loss of quality.
Questions and Answers
How to compress a PDF to reduce it's size?
  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.
What does compressing a PDF do?

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.
How do I reduce the size of a PDF without losing quality?

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.
Why is my PDF so big?

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.

Does compressing a PDF reduce quality?

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.

Do PDFs compress well?

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.

How do I reduce the size of a PDF offline?

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.

Are PDFs compressed?

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.

Is it secure to use PDF24 Tools?

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.
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