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You're in good company:

Zamzar has converted and compressed over 510 million files since 2006

Compress to different file sizes

You can use Zamzar to process a wide range of different files - just click on a format to get started:

Compress JPG to 10KB Compress JPG to 20KB Compress JPG to 30KB Compress JPG to 40KB Compress JPG to 50KB Compress JPG to 100KB Compress JPG to 200KB Compress JPG to 500KB Compress JPG to 1MB Compress JPG to 2MB

Why compress JPGs to 40kb

Compressing JPG files to 40KB is a practical fix for users hitting moderate size barriers on platforms like real estate listings, freelance gig sites, or customer support tickets that restrict image uploads for clarity and speed. Whether you're attaching a property photo, a design mockup, or a receipt scan, locking in at 40KB means smooth submissions without rejection, quicker transfers over mobile data, and the ability to include several visuals in one message or form without overwhelming inboxes or servers. It's ideal for remote workers sharing updates or shoppers uploading proof-of-purchase images with minimal delay.

JPGs are built for efficiency, but shrinking them to a precise 40KB calls for smart compression that keeps key details intact, great for small product images, profile shots, or annotated screenshots where recognition matters more than perfection.

Using Zamzar's JPG compressor, just upload your image, set the 40KB goal, and grab a clean, compliant file instantly. You get faster load times, hassle-free approvals, and easy sharing across any connection or device, all while maintaining an image that's sharp enough to get the job done.

Highly Reputable

Zamzar has been featured by TechCrunch, Wired, Lifehacker, the Guardian, and many more publications.

Highly Reliable

We convert tens of thousands of files each day, and have done for over ten years, and for each conversion we strive to provide the best experience possible.

Very Experienced

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

We want to make sure your experience is as positive as possible, so if you run into an issue for any reason, we want to help resolve it.