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Compress PDF to 300 KB Online for Free

by Hung Nguyen

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Need to compress a PDF to less than 300 KB for online submission? Use our free compression tool to shrink your PDFs. No registration is necessary.

Over the years, we’ve been working on improving our compression quality and reduce your PDF file size as much as possible, without hindering the file quality. At times, you may need to submit electronic documents in PDF format in such small sizes, and we hope our online tool could be of help in such cases.

How to Compress PDF to 300 KB or Less

  1. Go to the Compress PDF tool.

  2. Drag and drop your PDF file into the tool, choose ‘Basic Compression’.

  3. Wait for us to work on reducing its file size.

  4. Click download to save your PDF document.


How to compress PDF to 300 KB or less

The basic compression mode will compress your PDF file substantially - while maintaining the content in a near-identical version as it was in the original PDf format. And don’t you worry about file size caps - we can upload and shrink PDF files up to a whopping 5GB per file.

If somehow the data was not able to compress larger PDFs to 300KB or less, you would need to switch to the second compression option.

Stronger PDF Compression


The stronger compression mode is a premium option, but luckily, we now offer two-week free trials for those who need the tool immediately. To start a trial, upload your file to the compress tool, choose the second compression option, and you will be prompted to sign up!

If you only require to use the tool for free during the first two weeks, remember to disable the auto-renewal via the account page, and you will not be charged. If you do stay, a Pro Smallpdf package will enable you to a variety of benefits, including:

  • Batch compression - compress as many files as you’d like in one go

  • Conversion - from images, Word, PPT, and Excel to and from PDF format.

  • Edit - annotate, add text, or even eSign PDF files.

  • Access to the desktop app - in case you need to compress PDF to 300 KB size offline.

Compress PDFs on Any Device


We understand the need for compatibility. Smallpdf, the website, can be accessed via any internet browser, any operating system, and even on electronic handheld devices (mobile phones, tablets...etc.). All that you need is a working internet connection and the PDF file on your device - ready to be compressed.

We hope this could be of aides. While you are on our platform, be sure to check out the other 18 tools - in case you ever need to do more with your PDF documents.

Hung Nguyen
Hung Nguyen
Content Marketing Manager @Smallpdf