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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 reducing your PDF file sizes as much as possible, without hindering the file quality. At times, you might need to submit electronic documents in PDF format in such small sizes, and we hope our online tool can be of help in such cases.

How To Compress PDF to 300 KB or Less

  1. Go to the Smallpdf Compress PDF tool.

  2. Drag and drop your PDF file into the tool, choose “basic” or “strong compression.”

  3. Wait for us to reduce the 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. This should be more than enough for most PDFs. But if the tool’s not able to compress your larger PDFs down to 300KB or less, there’s always the strong compression option to save the day.

And don’t worry about file size caps—we can upload and shrink PDF files up to a whopping 5GB per file.

Stronger PDF Compression


The stronger compression mode is a premium option, but luckily, we offer 7-day free trials for those who need the tool immediately. To start a trial after you’ve uploaded your file to the compress tool, choose the second compression option and you’ll be prompted to sign up.

If you decide not to continue with a Pro account after the trial period, remember to disable the auto-renewal via the account page, and you won’t 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 Smallpdf Desktop App - in case you need to compress a PDF to 300 KB offline
  • Full access to the Smallpdf Mobile App - get your work done on-the-go

Compress PDFs on Any Device


We understand the need for compatibility. The Smallpdf 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 you found this article helpful! While you’re on our platform, be sure to check out our other 20+ tools—in case you ever need to do more with your PDF documents.

Hung Nguyen
Hung Nguyen
Senior Growth Marketing Manager @Smallpdf