Choose Files:


Drop PPT files here
(Up to 100 files, 40 MB each.)

Compression Settings:

Output Files:

To compress all output files in a ZIP file, click "" icon on the right, then click "Add to ZIP". To download one single file, simply right-click on file link and click "Save link as...".

File Name Original Size Output Size Size Compressed Actions

How to compress PPT files:

  1. Settings

    Set image quality first. Image quality value can be 1 (lowest image quality and highest compression) to 100 (best quality but least effective compression).

  2. Add Files

    Drag multiple PowerPoint files to the "Choose Files" section. File extension name can be .ppt or .pptx. Each PowerPoint file size can be up to 40 MB.

  3. Compress Files

    The batch compression automatically starts when files are uploaded. Please be patient while files are uploading or compressing.

  4. Output Files

    The output files will be listed in the "Output Files" section. To compress all output files in a ZIP file, click "" icon on the right, then click "Add to ZIP". You can right-click on file name and click "Save link as..." to save the file. The output files will be automatically deleted on our server in two hours, so please download them to your computer or save them to online storage services such as Google Drive or Dropbox as soon as possible.

  5. Unblock Files (if needed)

    You may need to unblock the PowerPoint files if your Microsoft PowerPoint software can't open them. To unblock a file on Windows, right-click on the file and open "Properties". Under the General tab, towards the bottom you will see "Unblock" button or checkbox next to "Security: This file came from another computer and might be blocked to help protect this computer". Click on it, then click "Apply/OK".

About:

The big change in PowerPoint 2007 was that the stable binary file format of 97-2003 (.ppt files) was replaced as the default by a new zipped XML-based Office Open XML format (.pptx files). Microsoft's explanation of the benefits of the change included: smaller file sizes, up to 75% smaller than comparable binary documents; security, through being able to identify and exclude executable macros and personal data; less chance to be corrupted than binary formats; and easier interoperability for exchanging data among Microsoft and other business applications, all while maintaining backward compatibility.

We can't find any open-source projects to compress PowerPoint presentations, therefore we wrote all the source codes from scratch by ourselves. This PowerPoint compressor compresses images in PowerPoint presentation to reduce file size.

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Aconvert.com is a sister website of Compresss.com, it focuses on converting files instead of compressing files.