<> #toolParams [name="dpi"], #toolParams [name="imageQuality"] { width: 50px; } @media (max-width: 600px) { #toolParams [name="dpi"], #toolParams [name="imageQuality"] { width: 40px; } }

Compress PDF

PDF compressor to reduce the size of PDF files quickly and easily

Free Online No limits Secure

PDF24 is free of charge

No hidden costs
100% free thanks to advertising
PDF24 is highly optimized so that advertising covers our expenses

PDF24's apps are easy to use

No installation required
Supports your system
PDF24 uses high-performance processing systems and your system will not be burdened

PDF24 can be used without restrictions

No registration required
No subscription traps or forced premium versions
No time restrictionsuse all PDF24 features as often as you like

Security is important at PDF24

SSL secured file transfer
Servers are located in Germany
Files are automatically deleted from the PDF24 server after one hour

Drop here

... or drop files here

By using this functionyou accept our terms of use

4.9 (14,355 votes)

Rated 4.92 out of 5 stars by 14355 users in the last 5 years.

Using PDF24 is fun and you will never want to use any other tool again.

Download Desktop App

File protection is active

SSL secured file transfer
Servers are located in Germany
Files are automatically deleted from the PDF24 server after one hour

😀 100% free thanks to advertising

Information

Windows Linux MAC iPhone Android

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 softwareyou 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.

Developed by Stefan Ziegler

How it works

Select files to compress using the file selection box.

If necessaryadjust the settings such as DPI and image quality. Start compression afterwards.

Finallysave compressed PDF files.

What others are saying

PDF files with images are often very largetoo 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 thisI 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?

Click in the file selection box at the top of the page and select the files to compress.
Change the compression parameters if you want. Start the compression with the corresponding button.
Finallysave the compressed files.

What does compressing a PDF do?

When reducing the file size of a PDFvarious methods are used to make the file smaller. Depending on what data is contained in the PDFthe 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:

Removal of font information that's not required for displaying the PDF.
Reduction of the image size depending on the DPI parameter.
Reduction of the image quality depending on the image quality parameter.
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 PDF24but you can't expect a big reduction in file size in this mode. That's how it works:

Click in the file selection box at the top of the page and select the files to compress.
Change the compression mode to lossless compression and start compression with the corresponding button.
Finallysave 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 imagesyou 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 modethe quality and size of the images are reducedas this has the greatest effect on the file size. Lossless compression can also be usedbut has less impact. Howevera reduction in quality is often not a problem. The question is more or less how much the quality can be reducedwhich is still acceptable in terms of file size.

Do PDFs compress well?

Yesif the PDF contains imagesbecause 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.

Ask a new question

Please rate this app

Please report problems here

Please share PDF24 with friends

Help our newcool and free tools to grow!

Write an article about our tools on your forumblog or website.

Alternative: PDF24 Creator

Desktop software for Windows with similar functions

PDF24 Creator