Fit a photo beneath a strict maximum file size.
Exact size image compressor
Compress image to 40KB
Make a photo smaller than 40KB without manually guessing quality settings.
Compress image to 40KB →Prepare a small image before a website rejects your upload.
Process up to 10 images with the same target.
How to compress an image to 40KB
TargetKB automatically balances JPEG quality and image dimensions to keep your image below 40KB.
- Open the TargetKB compressor with the 40KB limit already selected.
- Upload one image or up to 10 images at once.
- Download the optimized image and check its dimensions and file size before uploading.
Why use an exact-size compressor?
Many upload forms reject files for being only slightly too large. TargetKB works backwards from your requested limit, automatically balancing image dimensions and JPEG quality instead of asking you to guess a quality percentage.
Check byte limits, output quality and format limitations if your upload is still rejected.
Frequently asked questions
Is the result always below 40KB?
For supported images, TargetKB works toward a result below the selected maximum.
Are my images uploaded to a server?
Image processing is designed to happen locally in your browser.