---
type: lookup
id: flac-66-4c-61-43
asset: file-format-signatures
title: "66 4C 61 43 — File format magic numbers"
sources:
  - https://en.wikipedia.org/wiki/List_of_file_signatures
source_quote: "fLaC\", the FLAC stream marker in ASCII, meaning byte 0 of the stream is 0x66, followed by 0x4C 0x61 0x43"
generated: true
verified: false
harvested: 2026-08-03
stale_after: 2027-08-03
hex_signature: "66 4C 61 43"
offset: "0"
extension: "flac"
format: "FLAC"
unverified_fields: hex_signature
---
**Hex signature:** 66 4C 61 43

**Offset:** 0

**Extension:** flac

**Format:** FLAC

> fLaC", the FLAC stream marker in ASCII, meaning byte 0 of the stream is 0x66, followed by 0x4C 0x61 0x43

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