PDF compression

Compress a large PDF file to reduce the file size. There are multiple compression options

Completely free on-line No restrictions
Select File
... or drag and drop files here
How to compress PDF files online

How to compress PDF files online

With just 5 simple steps, you can compress your PDF files online!

  1. Click the Select File button or drag the file to the box above to upload the PDF file
  2. Select the compression mode you want: balanced, high compression and high quality
  3. Click the compression button to compress PDF
  4. Wait a few seconds or minutes, click the download button to download the file
  5. Or you can choose our other PDF tools, such as PDF splitting, PDF to Word, or water printing

Excellent PDF online compression tool PDF88

  • Completely free PDF online splitting tool

    Completely free

    Our PDF online compression tool is completely free of charge, without any hidden fees, and without the need for registration, payment, login and other tedious operations, it can be used directly!

  • PDF online split is easy to use

    Easy to use

    It only takes four simple steps to compress one or more PDF files without downloading software

  • Best online PDF compression platform

    Best PDF compression online tool

    Three compression modes are available, which can be adjusted independently. You can adjust the file size and quality freely

  • Fast compression

    Superior performance

    Dozens of megabytes and hundreds of pages of PDF files can be compressed in seconds without waiting for a long time

  • PDF splitting is safe


    Our server does not save any of your data. After processing, it will be deleted immediately. You need to upload it again next time

  • Leading technology

    Leading technology

    The industry-leading PDF technology solution, PDF compression maximizes the file quality, reduces the file size, has rich functions, and more functions to unlock

Online PDF compression FAQ

  • Is your online PDF compression tool free?

    you 're right! All tools of PDF88, including online compression tools, are free to use.

  • How do you compress PDF?

    When compressing PDF files, we will use different methods to reduce the file size
    The compression effect varies depending on the PDF file data. Generally speaking, the larger the image, the better the compression effect
    First, unnecessary font information will be removed for display
    Depending on whether the compression mode is balanced, high compression or high quality, we use different image compression ratios, colors and DPI
    to optimize the structure of the PDF file and remove redundant information

  • Why is my PDF file so large?

    If your PDF file contains more images, the file size will be large. In general, plain text PDFs are much smaller. If your PDF file has pictures, you can use PDF 88 to compress PDF pictures and delete unnecessary structures to reduce the file size.

  • Can the PDF format itself be compressed?

    PDF generally compresses the contained objects. However, this is optional. Objects in PDF files can be partially or completely compressed. Software that creates PDF files, such as Adobe, to decide whether to compress objects. PDF compression is not required in the PDF standard.

  • How to select compression mode?

    If you don't know which compression mode to use, just use the default one. We will consider the balance between image quality and file size
    If you have high requirements for image quality and want to retain the original image resolution, color and quality as much as possible, you can choose high-quality PDF compression
    If you want to reduce the file size more, you don't care much about the image quality. You can choose the high compression option.

  • Is your compression tool safe?

    PDF88 attaches great importance to the data security of users. Security makes us first consider and focus on safeguarding
    All data transmission channels are encrypted with SSL256, and other people cannot steal the data in them
    After processing, we will delete your files from the server immediately! Instant transfer and use, each PDF processing is a one-time use