Compress PDF size

Use our free PDF compressor to compress large files for easy sending.

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Get more docs done with our digital toolkit

  • Reduce PDF size

    Reduce PDF size

    Some files are too big to send. Lumin can change that. Compress your PDFs into a sendable file size in seconds.
  • Compress quickly

    Compress quickly

    Our free PDF compressor isn't just easy to use - it's also fast. Get bulky files on their way in no time.
  • Compress, don't corrupt

    Compress, don't corrupt

    Creating .zip files from your desktop can go wrong. Save yourself the headache of a corrupted .zip file and use our free Compress tool.

More impact, less admin.
Compress PDFs for free.

How to compress a PDF


Sign up

Head to Lumin Tools, a sub-site of Lumin, and create a free account. Select the Compress tool.


Add files

Drag and drop your files or upload them straight from Google Drive, Dropbox or your computer.



Done! Once your PDF file size has reduced, you can download your finished file or save it to your preferred document storage solution.

One platform for all your PDF tools

Explore our plans


For casual users trying out Lumin

$0 USD

$0 USD

Free includes:
  • Annotate 3 docs
  • Digitally sign PDFs

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For busy professionals or small teams

A small team is 5-10 people

$19 USD

Per month, per team

$19 USD

Per month, per team

Everything on Starter, plus:
  • 30 docs per month team-wide
  • Edit PDF text
  • Split documents
Looking for a team or business plan?View plans

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Compress PDFs
in seconds

Compress PDFs<br /> in seconds

Frequently asked questions

  • What is Lumin vs Lumin Tools?

    Lumin Tools is a sub-site of Lumin hosting more advanced editing features such as the PDF Unlocker tool, OCR reader, Convert, Compress and more. Both sites are completely free to use.

  • Is Lumin free?

    Sure is! Lots of our tools are free. You can draw on PDFs, comment on them, add text, signatures and images; all the basics are covered.

    Our paid plans expand your toolkit: you can edit PDF text, redact information, create fillable fields and much more. Discover our plans to learn which one is the right fit for you.

  • How do I use Lumin?

    Lumin works on your browser, or you can download our desktop app and keep Lumin handy on your computer. We’ve also got a mobile and tablet app which includes Lumin’s most popular features.

  • Can I just compress a PDF and go?

    Yes. You need to create an account in order to use Lumin Tools, but it’s easily done and you’ll be compressing files in no time. You’ll have a range of other PDF features at your disposal too, should you choose to explore them.

  • Why is compressing better than zipping?

    When you zip a PDF file and send it from person to person, your files have a higher chance of becoming corrupt along the way. Lumin’s Compress tool is fast, easy and free, saving you time and peace of mind.