HEIC in, JXL out, right here in your browser. Your file is read and re-encoded in this tab, so nothing is uploaded.
The converter loads in a moment. If it does not, enable JavaScript; the conversion runs in this tab, so the page needs it.
HEIC is what iPhones save photos in. It is efficient, and almost no desktop software can open it. JPEG XL is a next-generation format that beats JPG and PNG on size while still offering lossless, but no browser can display it yet. This page moves a HEIC to a JXL in your own browser: the file is read, re-encoded and handed back without being uploaded.
Both formats carry transparency, so a transparent background survives the conversion.
JXL is a lossy format: the encoder discards detail to make the file smaller, and the quality slider on this page is how you choose how much.
No browser can decode HEIC, so this page ships its own decoder and runs it in a worker on your device. That is what the first HEIC conversion is waiting for.
Encoding JXL also runs on your device rather than on a server, so a file you would normally hand to a website is written by your own machine.
This page reads HEIC and cannot write it. There is no HEIC encoder here on purpose: files written as HEIC often will not open anywhere else.
Yes, and there is nothing to unlock. The conversion runs in your browser, so there is no account, nothing to pay and no licence key to enter. Every format and every feature on the site is available to everyone.
No. Your file is decoded and re-encoded inside this tab and never uploaded. The ads on this page are served by Google and do see that you are here, but they never see your file. You can check it yourself: open the network panel and search for a request carrying your picture.
Yes. Both HEIC and JXL carry an alpha channel, so a transparent background comes through unchanged.
Some, and it depends on the picture and the setting. JXL is lossy, so it throws away detail the encoder thinks you cannot see. The quality slider is adjustable from 10 to 100 before you convert, and the queue shows you the resulting file size so you can trade one against the other.
No. There is no HEIC encoder on this page, deliberately: files written as HEIC often will not open in anything else, so producing them here would be worse than not offering it.
No. No browser can read HEIC, so this page ships its own decoder and loads it the first time you convert one. The file never leaves your device to be decoded anywhere.
Not in a browser, not yet. No current browser displays JXL; it is for software that has its own codec. If you need a file anything will open, convert to JPG or PNG instead.
Yes. Drop a batch onto the page and every file is converted in the queue, then downloaded together. The queue also shows the size before and after, so you can see what the conversion saved. There is no cap on how many files you convert at once; the only real limit is what your device can hold in memory at the same time.
Convertlab converts images and video in your browser. Everything above runs on your own device, so no file is ever uploaded.