Compress Image to 300 KB
Drop any photo, screenshot or scan and it comes back as a JPEG under 300 KB — at the highest quality that still fits. The whole search runs in your browser.
Where 300 KB comes from
300 KB turns up on visa applications, passport and licence renewals, and the better-designed job portals — forms whose authors worked out that a photograph needs somewhere to live. It is the first ceiling on this list where a full-resolution phone photo is genuinely in reach, so the trade stops being about what to sacrifice and starts being about how little you have to.
What it costs to get under 300 KB
Most 12-megapixel photos reach 300 KB on quality alone, somewhere in the high sixties, with every pixel of the original still there. That is well inside the range where the difference from the original is invisible at screen size and hard to find even at full zoom. Only very detailed frames — dense foliage, crowds, heavy grain from a low-light shot — push far enough to need resizing as well.
Why this one is different
Hitting an exact ceiling takes eight to ten trial encodes. A hosted compressor pays for every one of them on every visitor, so it guesses a quality once and hands back whatever that produced. This one runs the search properly, because the processor it runs on is yours.
Compress to a different size
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Questions
How do I compress an image to 300 KB?
Drop your images onto the box above. Each one is re-encoded as a JPEG that lands under 300 KB, using the highest quality that still fits, and the row underneath says what quality that was and whether the image had to be resized. Nothing is uploaded and there is no account.
Is 300 KB enough for a printed passport photo?
For the digital upload, comfortably. For something you intend to print, size in bytes is the wrong measure — what matters is pixels per inch at the printed size, so keep the original file for the print shop and use this one for the form.
How does it decide when to stop?
It searches for the highest quality that still fits, rather than guessing one and hoping. Roughly eight trial encodes narrow it down, then a slower final pass squeezes a few more percent out at the same quality. That search is only affordable because it runs on your machine instead of a server.
Do my files get uploaded anywhere?
No. Everything happens in this tab. Your files are never sent to a server, which is why this still works if you disconnect from the network after the page has loaded — and why there is no limit on how many you put through it.