Compress JPEG to 40 KB

Compress a JPEG to 40 KB without uploading it.

or drop an image anywhere on this page

JPEG only (.jpg, .jpeg) · up to 50 MB

Files never leave your device
Free, no sign-up
No watermark

How to use this tool

Choose a JPEG file, or drag it onto the drop area. Only .jpg and .jpeg files are accepted on this page.
Check the target size (currently 40 KB). It is editable, so change the number or the KB/MB unit if your limit differs.
Press the button. The tool lowers the quality first, then reduces the dimensions step by step if the file is still too large.
Compare the preview and the measured output size with the original, and read any notes or warnings.
Download the new file. If it missed the target, adjust the target slightly or crop the original, and try again.

What to know before you compress JPEG to 40 KB

Forty kilobytes sits comfortably above the strict 10 to 30 KB tier. For a portrait this usually means enough detail to keep eyes, eyebrows and hairlines clear, at reduced dimensions that depend on the picture. The target is also a safe choice when a portal states a limit of 50 KB, because it leaves a margin for differences in how sites count kilobytes. Photos that start as multi-megabyte phone shots still need to be reduced dramatically, but there is much less compromise than at 20 KB. Landscape and detailed scenes benefit the most from the extra headroom, since fine textures like leaves and brickwork are the first things to degrade as the budget tightens.

At 40 KB most portraits keep good clarity at screen resolution. This is a handy size for ID photos and portal uploads. The size you enter is a goal, not a promise: the result depends on the original image, its dimensions, its complexity, its format and your browser's encoder, and the tool reports the real size instead of assuming it.

Recommended settings and supported formats

This page accepts JPEG files only. Keep the default 40 KB or edit it. If a form states 50 KB, 40 KB leaves a useful safety margin; check the actual output size shown by the tool before you upload.

Accepted input: JPEG (.jpg, .jpeg). Output is always JPEG, and transparent areas, if any, are filled with white.

Practical uses

ID photo and application portal uploads
Photos for forms that cap attachments just under 50 KB
Lightweight listing images where page speed matters

Tips for a smaller file

Aim 10 to 20% below a strict limit for safety.
Crop out wasted space around the subject.
Avoid multiple rounds of compression; always start from the original.
Preview the output on a phone-size screen if that is where it will be viewed.

Frequently asked questions

Is 40 KB a good size for an ID photo?

For many portals, yes. It is large enough to keep a face clear at screen resolution while staying under common limits like 50 KB.

Does the tool always hit exactly 40 KB?

No. It keeps the largest attempt that fits, so the final size is usually slightly under 40 KB. The exact figure is shown after processing.

Can I change the target on this page?

Yes. The target size and unit are editable, so you can adjust them to match any form's requirement.

Related image size tools

Privacy

Your image is processed entirely in your browser using your own device. It is not uploaded to Paul Digital or any other server, and nothing is stored once you close the page.