Convert qoi to heif
A browser can't do this one — here is what it can do.
Desktop app only
Nothing that runs in a tab can write heif from qoi. This pair is waiting on the desktop build, which hands the job to the real command-line tools.
Browse what does workAbout QOI
Quite OK Image Format
A lossless image format published by Dominic Szablewski in 2021, designed to encode and decode much faster than PNG at similar file sizes. Its whole specification fits on one page. Use it in games and tools that load many images and care more about decode speed than support in other apps.
About HEIF
High Efficiency Image File Format
An MPEG container standard (ISO/IEC 23008-12) from 2015 for single images and image sequences. It can hold HEVC, AV1 or other codecs, along with depth maps and bursts. Convert HEIF to JPG or PNG for apps and sites that cannot read it.