Compress an image to 400 KB
For gallery pictures that people open and look at closely.
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How it works
Add your images
Drag and drop, paste, or pick files. They upload over an encrypted connection.
Pick a quality or a target size
Use the quality slider, or tell it exactly how many KB or MB you need.
Download
Save each file, or grab them all at once as a ZIP.
400 KB is a good weight for the picture people click on to see larger. It keeps skin texture, fabric and fine lines in a photograph while cutting a typical phone original to a tenth of its size.
The tool picks the best quality that fits under 400,000 bytes, and reduces the pixel size only when quality alone cannot get there. Most phone photos finish with a width near 2000 pixels and little visible loss.
Gallery pictures are examined in a way that thumbnails are not. A viewer leans in, so the file needs enough detail to reward the attention. At 400 KB there is a lot to look at.
A budget for detail
Four hundred kilobytes is 3.2 million bits. That supports about 1800 pixels square, or 2000 by 1300 for a landscape, with clean detail in ordinary scenes. A picture of this size fills most laptop screens when it is opened in a viewer.
Lightbox views and zoom
Many sites show a small picture in the page and a larger one in a pop-up. The pop-up picture is the one to give 400 KB. Make the small version separately at 60 or 80 KB, so the page loads fast and the big file arrives only for the visitor who asks for it.
Portraits and skin
Skin shows compression damage as blotches or waxy smoothness when the file is too small. At 400 KB a portrait keeps pores and fine hair, so the person still looks like a person. If you see waxiness, raise the target to 600 KB for that photo.
Landscapes with fine texture
Grass, gravel and tree leaves are demanding. A 400 KB landscape of 2000 pixels keeps the shapes and most texture, but a very busy scene may need the width trimmed to 1700 pixels to stay sharp.
Checking at 100 percent
Zoom the result to 100 percent, which shows every pixel, and look at an area with fine detail. If it looks clean there, it will look clean everywhere a viewer is likely to see it.
When a viewer wants the full file
Some visitors will want more than 400 KB gives them, such as a designer looking for a texture or a buyer checking a print. Offer a link to a larger version for them, and keep 400 KB as the default that everyone else sees.
That way the gallery stays quick and the few people who need more can still get it.
Reviewing the set before publishing
Before the gallery goes live, open it and scroll through every picture. You may notice that one is darker, another grainy and a third too soft. Send those back to the compressor and adjust the target or the size.
Five minutes of review saves months of annoyance for visitors.
Frequently asked questions
Is 400 KB too big for a blog?
For hero and gallery pictures it is reasonable. Use smaller targets for thumbnails and inline pictures.
Will I be able to print it?
At 2000 pixels, a small print up to about 10 by 7 inches looks fine. For larger prints keep the original.
Why does a busy photo come out smaller in pixels?
It needs more bytes per pixel, so the tool reduces the pixel count to stay under 400 KB.
Does it keep the camera orientation?
Yes. The picture is turned the right way up before compressing.
Is the metadata kept?
No. Location and camera details are removed from the result by default.
Can I set 450 or 500 KB instead?
Yes. Pick Custom in the Target size menu and type the number.