Advanced Settings (optional)
Or choose a target size
You're in good company:
Zamzar has converted and compressed over 510 million files since 2006
Resize to different file sizes
You can use Zamzar to process a wide range of different files - just click on a format to get started:
Why resize your image to 40kb
Bulky image files create practical problems across countless everyday situations. When you're uploading images to online forms, submitting applications, or sharing files via email, oversized images often get rejected or cause uploads to fail completely. They can also bog down website performance, reduce loading speeds, and quickly eat through limited storage allocations on cloud services or hosting platforms. For anyone working with batches of images, these file size issues become a constant source of delay and frustration.
Resizing images to 40KB strikes a useful balance between maintaining visual quality and keeping files manageable. You'll get enough detail for clear viewing whilst ensuring smooth uploads and fast loading times. This size is ideal for estate agents preparing property photos for multiple listing platforms, graphic designers creating web banner previews, event organisers sharing promotional images across social channels, or administrators uploading staff headshots to company intranets. Online tutors often resize educational diagrams to 40KB for sharing in virtual classrooms, and small business owners use this size for newsletter graphics that need to display properly across different email clients without causing deliverability issues.
Zamzar's online image resizer handles the compression and resizing process quickly and simply. Upload your image, we'll optimise it to 40KB, and you can download the resized file ready to use.
Privacy
We recognise that you have entrusted Zamzar with your files and your personal information, and handling your data is a serious responsibility; we want you to know how we go about doing that. Our privacy policy can be read here.
Quick
Converting a file is as easy as three clicks of a button - one click to upload your file, another to select the new file format and the final one to make the magic happen!
Very Experienced
We’ve built up quite the armoury of file conversions, with over 1100 different file conversions now supported.
High Quality
A converted file doesn't mean a change of formatting or style. Instead, the only thing you should notice is a new file extension.