# JPEG 2000 format — file signature FF 4F FF 51 at offset 0

For JPEG 2000 format, hex signature is FF 4F FF 51; extension is jp2 j2k jpf jpm jpg2 j2c jpc jpx mj2, verified against its source on 2026-09-22.

- **Hex signature:** FF 4F FF 51 _(verified: appears in the quote below)_
- **Offset:** 0 _(verified: appears in the quote below)_
- **Extension:** jp2 j2k jpf jpm jpg2 j2c jpc jpx mj2 _(verified: appears in the quote below)_
- **Format:** JPEG 2000 format _(verified: appears in the quote below)_

## What the source says

> 00 00 00 0C 6A 50 20 20 0D 0A 87 0A | ␀␀␀␌jP␠␠␍␊‡␊ | 0 | jp2 j2k jpf jpm jpg2 j2c jpc jpx mj2 | JPEG 2000 format [18] | FF 4F FF 51 | ÿOÿQ |

## Source

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

Last verified: 2026-09-22. Review by: 2027-09-22.
Part of [File format magic numbers](https://referencesource.org/file-format-signatures/).