# 4F 54 54 4F — File format magic numbers

For 4F 54 54 4F, offset is 4F; extension is otf; format is OpenType font, recorded from its source on 2026-08-03.

- **Hex signature:** 4F 54 54 4F _(unconfirmed — we could not tie this to the quote below)_
- **Offset:** 4F _(unconfirmed — we could not tie this to the quote below)_
- **Extension:** otf _(unconfirmed — we could not tie this to the quote below)_
- **Format:** OpenType font

## What the source says

> OpenType font

## 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/).