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Zamzar has converted and compressed over 510 million files since 2006

Why compress PDFs to 40kb

If you've ever tried to email a PDF and been told the file is too large, you're not alone. PDF files can balloon in size for all sorts of reasons, from scanned pages to embedded images, and even relatively short documents can end up well over the limit that most email providers or online platforms allow. This can be frustrating when you just need to quickly share something like a contract, a CV, or a completed application form.

Compressing a PDF to 40KB gives you a bit more breathing room than the tightest size limits, while still keeping the file small enough to send and upload without any issues. It's a practical target for documents that include some images or graphics alongside text, such as a short brochure, a business proposal, or a few pages of meeting notes with screenshots. Zamzar's online PDF compressor handles this in a straightforward way: upload your PDF, and you'll be able to download the compressed version shortly after. Whether you're a teacher sharing a resource with students, a freelancer attaching work samples to a pitch, or simply trying to keep your digital files tidy, getting your PDF down to 40KB means you're unlikely to run into size restrictions wherever you need to share it.

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People trust us to do their file conversions because we've been doing it to a high standard for over 10 years.

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We pride ourselves on being the best online file-conversion site there is, and because we’ve got over 15 years of experience, we’re confident we know what our customers need.

Dedicated Support

As well as a support team, we also have a page of FAQs and a catalogue of videos to assist you should you run into an issue.