Compress PDF

Reduce your PDF file size in just a few clicks

or drop file here
Basic compression
Medium file size, high quality.


Strong compression
Smallest file size, good quality.


How To Compress PDF Online for Free

  1. Click the Select a file button
    Drag the PDF file you want to compress to this page and upload it.
  2. Compress options
    If you select the desired compression level, PDF compression will start automatically.
  3. Please wait a moment
    Please wait while the PDF file is being compressed.
  4. Click the download button
    Click the Download button to save your compressed PDF.

More about PDF Compressor Tool

High quality conversion

Perfect quality

Reduce the size of your PDF files while maintaining good quality with our free online PDF Compressor. Even after the file is compressed, it retains the format and layout of the original file. The compressed PDF file size is much smaller, but the quality is perfect for sharing via the web or email.

Quick and easy conversion

Easy and fast compression

Is the PDF file too big to send by email? You can simply compress the PDF file size in just a few clicks online and upload it via the web and email. Our online tools provide a user-friendly web interface so that users can quickly understand how to use it in a short time. Now, compress the PDF quickly and easily.

Compression level

PDF compression level settings

Users can select one of two PDF compression level options after uploading a document. Higher compression levels result in smaller file sizes for some documents, but may reduce PDF quality. Choose one of the compression levels to get the optimized file you want.

Secure PDF Compression

Secure PDF Compression

Reduce PDF file size online without worrying about personal information. We protect all file transfers with SSL/TLS encryption and protect user data and files with automatic deletion.

Automatic Deletion

Automatic deletion

After you have finished working with your digital documents using our online PDF tools, you can download the files from our servers and manually delete them yourself. Don't worry if you forget to delete a file. To protect user data, all files on the server are designed to be permanently deleted after 30 minutes. No one can access your files and your privacy is 100% secure.

Processing in the cloud

Process in the cloud

All PDF processing is done completely in the cloud, so it does not consume any resources on your computer. You can use all PDF tools for free through your web browser anywhere you have an internet connection. You no longer need to install or update software to work with digital documents.

Did you know?

Four benefits of PDF compression

When a PDF contains many pages, many images and multimedia content, the file size becomes very large. Even so, there is no problem opening PDFs on any device to view or edit its contents, making it one of the most popular file formats today. Large PDF files take up a lot of storage space on users' devices and are difficult to send via email or other sharing tools. In this case, compressing the PDF file to reduce its size can solve this problem. Our online PDF tool uses lossless compression algorithms to compress your PDFs, so you can get as small a file size as possible without sacrificing quality. Here are four advantages of compressing PDF files.

Reduction of file size

The most obvious benefit of PDF compression is that it reduces the file size of your documents, making them easier to share and store. This is especially important if you have large PDFs that are difficult to email or upload to cloud storage. Compressing files can reduce their size by up to 90%, making them much easier to manage. You can store more PDFs on your computer or in the cloud without having to worry about running out of space, saving valuable storage space as well.

Enhanced sharing

Another benefit of PDF compression is that you can more easily share your files with others. If you have a large PDF file that needs to be shared with others, it can be difficult to email or upload to a shared storage platform. However, compressing files takes up less bandwidth and storage space, making them much easier to share. This can be especially useful for people who work remotely or collaborate with others from different locations.

Faster upload and download times

In addition, compressing PDFs reduces the file size and allows you to transfer files faster, resulting in faster upload and download times. This can be especially important if you're working with a large PDF that takes a long time to upload or download. Compressing files saves you time and improves efficiency by allowing you to transfer files faster.

Improved accessibility

Compressing PDFs can also improve accessibility for people with limited internet connections. Large PDFs can take a long time to download and some people may not be able to access the files at all due to limited internet speeds. Compressing the file makes it easier for these individuals to download and view the file, making it more accessible.


What are the advantages of Onlinepdfconverter PDF Compressor?

Our PDF Compressor is a reliable tool to reduce PDF size by providing a simple interface. It also provides optional compression level where users can control the PDF size for compression. Our online service is highly compatible, making PDF file compression work flexible and convenient for users of all devices. You can compress PDFs on any operating system. It doesn't matter if the user's device is Windows, MacO, Linux or Android. Open the PDF compression service page in your web browser, upload your document, select a compression mode, and compression will start automatically. You will be able to download the compressed document in a few minutes.


Frequently Asked Questions About Our Online PDF Compressor

How many times can I compress a PDF freely?

Unlimited. You can use it freely without limit of number of times.

What is the maximum size of a PDF document that users can compress?

It allows up to 100MB PDF file size.

How do online PDF compressors compress?

Our free service uses several techniques to optimize PDFs. Here are some of the key techniques our compression tools use.

  1. Shrink or compress all images

  2. Merge duplicate streams

  3. Unembed fonts

  4. Enable reusing page content

  5. Remove flattening form fields

  6. Remove or flatten annotations

  7. Remove unused objects

Can I compress documents in formats other than PDF?

No. This tool is designed to compress only PDF files. But there is a way. First, you need to convert documents from other formats to PDF format, then use our PDF compression tool.

Review has a clear and concise interface and tells you exactly how to compress the file. The best part is that it's free and you can choose the compression level that's right for you. I hope this service lasts a long time.


This is an excellent PDF tool for many reasons. It provides extensive features that are normally not offered by free online services. It would be even greater if they allow a batch PDF compression, though. Hope to see that function added soon.


This is an amazing FREE online tool that anyone can access from any device as long as you have an internet connection. It provides a lot more than just PDF compression - pretty much everything I did with my old Pro subscription like merging, splitting and converting PDF files, etc. Looks like there's no Google Drive sync yet, which is the only downside for me.