ShilaharStudios

About the image converter

The three formats are good at different things. JPEG stores photographs compactly and cannot store transparency. PNG is lossless, keeps transparency, and is the right choice for screenshots, logos and anything with text. WebP does both jobs and produces smaller files than either, at the cost of not opening in some older software.

Converting from a lossy format to another lossy format re-compresses an image that was already compressed. It works, but each round discards detail that cannot come back, so convert from the original where you have it.

Frequently asked questions

Is my image uploaded anywhere?
No, and this is the whole point of the tool. The file is read by the page, processed by your own browser and handed straight back to you. It never reaches a server, there is nothing to delete afterwards, and you can disconnect from the network before choosing a file and it still works.
Why did my transparent background turn black elsewhere?
Because JPEG cannot store transparency, and a canvas that is not filled first is transparent black rather than white. This tool fills with the colour you choose - white by default - and tells you before it does.
Should I use WebP?
For the web, usually yes: it is smaller than JPEG at the same quality and keeps transparency like PNG. Every current browser supports it. Some desktop software and older devices still do not, so it is a poor choice for a file someone will open outside a browser.
Can it convert HEIC photos from an iPhone?
Only if your browser can decode HEIC, which most cannot. The file picker will accept it and the conversion will fail with a message rather than a broken image. Exporting as JPEG from the phone is the reliable route.
Is there a size limit?
25 MB, and a warning above 10 MB. The constraint is memory rather than bandwidth: an image has to be decoded into a canvas to be worked on, and a 100-megapixel photograph needs far more memory decoded than it does on disk. A clear refusal is better than a tab that stops responding.

How your data is handled

Everything happens on your device. There is no upload, no storage and no logging. Closing the tab clears everything you entered.