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Compress Image to 350 KB
Compress an image to 350 KB or less in your browser. No account, no daily limit, nothing uploaded.
No account · No daily limit · No card · Nothing to cancel
Full pixel size keptRe-encodes only if the file gets smaller Nothing is ever made bigger
The encoder works at a quality that does not show, and stops there. You do not pick a number.Your images are processed by your own browser. Nothing is uploaded, there is no account, and there is no daily limit.
Compress to another size
Every limit is different. These run on the same engine, so switching is instant.
What 350 KB leaves alone
350 KB is a budget for a scan that was taken at a higher resolution than a form strictly needs — 300 dots per inch rather than 150, for example. More resolution means more bytes before you have lost anything visible.
If the result looks soft, do not compress harder: reduce the scan resolution deliberately, which removes real detail, rather than letting the encoder guess.
When a form allows 350 KB
- A high-resolution scan with a 350 KB limit
- Documents that will be zoomed into or printed after upload
- Pages with small print, tables and stamps together
- Archives where the file should still be readable years from now
Caps in the hundreds of kilobytes
Once a limit reaches the hundreds of kilobytes it has stopped being about saving space and started being about keeping uploads sane. Advertising portals, print shops and listing sites use this range because it comfortably holds a detailed photograph while still being small enough to move around a network without thought. In practice you will often not need the tool at all here — plenty of camera photos arrive under 350 KB on their own. When you do need it, the change is one careful re-encode rather than a squeeze.
How a file at 350 KB looks
Very good for print on a scan. Fine print and thin lines survive better here than at 300 KB, which is the difference the extra fifty kilobytes buys.
A file that lands here usually keeps its original pixel dimensions and looks like the original at any normal viewing size. If your source is already under the target, the honest answer is that there is nothing to gain and the tool will say so instead of re-encoding for the sake of it.
How it works
- Add your imageDrop it above, or choose a file from your device.
- Choose howSmallest file keeps the best quality and takes no number, or set the exact size your form asks for. Nothing is compressed until you press Compress.
- Compress and downloadPress Compress, and the finished size is shown before you save, so there are no surprises.
Questions
How do I compress an image to 350 KB?
Drop your image into the box above, check that the target reads 350 KB, and press Compress. The finished size is shown before you download, so you can see that it fits before you save it.
Will 350 KB change how my photo looks?
Barely. At this size the encoder can usually keep the full pixel dimensions and still fit inside the limit, so what changes is the file, not the picture.
Is 350 KB enough for a photo I might print?
For a small print, yes; for a large one, be careful. Printing magnifies the fine detail that compression removes first, so if you plan to print, a target in megabytes is the safer choice.
Will compressing to 350 KB ruin the quality?
Very good for print on a scan. Fine print and thin lines survive better here than at 300 KB, which is the difference the extra fifty kilobytes buys.
Does a higher-quality scan need more than 300 KB?
A 300 dpi colour scan of a full page often does. 350 KB keeps the lettering crisp and the paper texture intact, where a tighter size starts to sponge the edges of the text.
Which format should I choose — JPG, PNG or WebP?
Photos: JPG or WebP, because they are built for photographs. Logos, signatures, screenshots and anything with flat colour: PNG, so the sharp edges stay sharp. If you are not sure, leave it on “keep original format”.
What does “350 KB or less” mean here?
The tool aims just below your number, never above it. If the image is already smaller than 350 KB it is left untouched rather than re-encoded and degraded.
Is this free? What is the catch?
There isn’t one. The compression runs inside your browser using technology already built in, so there is no server doing the work and nothing to charge for. This page shows ads, and that is the whole business model.
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