# FF 4F FF 51 — File format magic numbers

For FF 4F FF 51, offset is 0; extension is qoif; format is QOI - The “Quite OK Image Format”, recorded from its source on 2026-08-03.

- **Hex signature:** FF 4F FF 51 _(unconfirmed — we could not tie this to the quote below)_
- **Offset:** 0 _(unconfirmed — we could not tie this to the quote below)_
- **Extension:** qoif _(unconfirmed — we could not tie this to the quote below)_
- **Format:** QOI - The “Quite OK Image Format”

## What the source says

> <https://en.wikipedia.org/wiki/QOI_(image_format)> QOI - The “Quite OK Image Format” [ 19 ]

## Source

- https://en.wikipedia.org/wiki/List_of_file_signatures

Last verified: 2026-08-03. Review by: 2027-08-03.
Part of [File format magic numbers](https://referencesource.org/file-format-signatures/).