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Reduce PDF File Size Below 100 KB Online

by Hung Nguyen

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The best free online tool to compress large PDFs while maintaining both file format and quality. No registration or download needed.

We love helping to convert PDF documents for millions of people on a daily basis, but our favorite tool dates back to the very first functionality of Smallpdf—PDF compression. If you need to significantly reduce PDF file size below 100 KB, you’re on the right platform.

Compressing PDF files is easy as pie. Hundreds of large PDFs get their size reduced every minute, and this is how you can do it yourself, within a few seconds.

How To Reduce PDF File Size Below 100 KB for Free

  1. Go to the Compress PDF tool.

  2. Drag and drop your PDF into the toolbox to reduce the file size.

  3. Choose the compression type and click “Compress.”

  4. The PDF compression tool will shrink the file down.

  5. Download the shrunken PDF.

reduce pdf file size below 100 kb

Reducing PDF files to below 100 KB, just for your needs.

How Big Can You Take?


The maximum file size that our online PDF compressor can manage is up to 5GB per file. With this, we can take on any of your portable document format files and cut the size down for you. The resulting size as well as compression rate in percentage will be displayed on the result page.

And yes, it’s free to use, for your convenience.

What About the Quality of My Files?


Quality retention is a guarantee. The file reducer tool works on large PDF documents by scanning each file, identifying similar data patterns, and replacing all the duplicates with a unique identifier. Each of these identifiers is much smaller in comparison to the original content of the PDF, and thus, the size is considerably smaller.

Batch Processing & Stronger Compression


With a Smallpdf Pro subscription, you get access to batch processing. You can drag and drop as many files as you’d like into the toolbox and process them at the same time. With a Pro account you also get access to stronger compression—up to 75%!

Sign up for a free trial to try it out today.

Further Modification


Make sure that your PDF looks perfect with the rest of our tool suite. Similar to the compressor, they are equally fast, effective, and easy to use—for free! Here are a few other guides to get you started:

  • PDF to Word - transform PDFs into Microsoft Word files to make easy adjustments.
  • Word to JPG - if you need to then convert text files to the most popular image format.
  • Add Pages - the many ways to edit pages in PDF files, and cut down its size even further.
  • PDF Scanner - your guide to OCR and reducing file size for scanned PDF files.
  • Sign PDF - need to sign a document? Use our tool to digitally sign your documents.
  • PDF Converter - convert any file (JPG, Word, Excel, and more) to and from PDF.
small but just as efficient

Small PDF files, but just as efficient.

Hung Nguyen
Hung Nguyen
Senior Growth Marketing Manager @Smallpdf