Convert gif 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 gif. This pair is waiting on the desktop build, which hands the job to the real command-line tools.
Browse what does workAbout GIF
Graphics Interchange Format
CompuServe's 1987 format, limited to a palette of 256 colors per frame and compressed losslessly with LZW. It supports simple animation and on-or-off transparency. Use it for short looping animations where broad support matters more than color depth.
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.