Convert HEIC to AVIF
Both descend from the same video codec generation, so the size barely moves. What changes is that every current browser opens AVIF and none of them open HEIC.
It happens on your device. Nothing is uploaded — including video.
↑ 0 bytes uploaded
What changes when you convert HEIC to AVIF
- Onhand reads HEIC but does not write it — the demand runs one way, out of HEIC and into something with broader support.
- AVIF is lossy. The quality control is a real trade, not a placebo — Smallest, Balanced and Best produce genuinely different files.
- Safari decodes HEIC natively. Chrome and Firefox do not, so on those Onhand loads a decoder the first time — once, then cached.
How to do it
- Drop your HEIC file above, or click to browse. A whole folder works too.
- AVIF is already selected. Change it on any row if you want something else.
- Pick a quality — Smallest, Balanced or Best. Balanced is a good default.
- Press Convert, then Save. Nothing left your machine.
Questions
- Is my HEIC file uploaded anywhere?
- No. The conversion runs inside this browser tab using WebAssembly. There is no server involved, which is why there is no file-size cap, no queue and no account. The counter in the header measures bytes this page sends, and it stays at zero.
- Is there a file size limit?
- No imposed limit, but a real one: a browser tab has roughly 1.8 GB of working memory. Onhand estimates before it starts and tells you if a file is too large, rather than failing halfway through.
- Does it work offline?
- After one visit, yes. The page and the codecs it has used are cached, and the badge appears only when the codecs for your chosen formats are genuinely available offline — not merely because something is installed.
- Can I convert several files at once?
- Yes. Drop a folder, or select many files. Each row gets its own target format, or you can set them all at once, and everything downloads as a single zip.