---
type: lookup
id: otf-4f-54-54-4f
asset: file-format-signatures
title: "4F 54 54 4F — File format magic numbers"
sources:
  - https://en.wikipedia.org/wiki/List_of_file_signatures
source_quote: "OpenType font"
generated: true
verified: false
harvested: 2026-08-03
stale_after: 2027-08-03
hex_signature: "4F 54 54 4F"
offset: "4F"
extension: "otf"
format: "OpenType font"
unverified_fields: extension, hex_signature, offset
---
**Hex signature:** 4F 54 54 4F

**Offset:** 4F

**Extension:** otf

**Format:** OpenType font

> OpenType font

Source: <https://en.wikipedia.org/wiki/List_of_file_signatures>