Compress PDF to 100KB

The Acrobat online PDF compressor balances an optimised file size against the expected quality of images, fonts and other file content. Just drag and drop a PDF into the PDF compression tool above and let Acrobat reduce the size of your PDF files without compromising quality.

For more refined control of optimisation settings, you can try Adobe Acrobat Pro for free for seven days. Acrobat Pro lets you customise PPI settings for colour, grayscale and monochrome image quality. You can also use PDF editor tools, edit scans with OCR functionality, convert PDFs to Microsoft PowerPoint and other file formats, convert PNGs and other image file formats, organise and rotate PDF pages, split PDFs, optimise PDFs and more. You can use Acrobat on any device, including iPhones and on any operating system, including Mac, Windows, Linux, iOS or Android.

Adobe Acrobat’s online PDF compressor can handle files up to 2 GB in size, but compressing a PDF down to 100 KB is only practical under certain conditions. To reach that size, which is usually called hyper-compression, the original file should be relatively small—ideally under 1 MB—and primarily text-based. PDFs with high-resolution images, complex layouts, or embedded fonts are less likely to compress that far without noticeable quality loss, even with maximum compression settings. While the tool is powerful, the final file size depends heavily on the content and structure of your document.

If you want to further compress a PDF file, you need to reduce the colour depth of the images. However, this will affect the quality of the images. You can also remove unnecessary metadata from the PDF file in order to further reduce file size.

Can I compress several PDF files to 100 KB each at the same time?

Yes, Acrobat supports batch processing, allowing you to compress multiple files at once. However, reducing each file to exactly 100 KB depends on the content of each PDF. Files that are mostly text and under 1 MB in size are more likely to reach that target. PDFs with images, graphics, or complex formatting may not compress to 100 KB without significant quality loss, even when using the highest compression settings.

How long does it take to compress a PDF to 100 KB?

Compressing a PDF to 100 KB usually takes just a few seconds to a minute, depending on the file size or your internet speed.