# Adobe Flash .swf — file signature 43 57 53 at offset 0

For Adobe Flash .swf, hex signature is 43 57 53; offset is 0; extension is swf, verified against its source on 2026-09-22.

- **Hex signature:** 43 57 53 _(verified: appears in the quote below)_
- **Offset:** 0 _(verified: appears in the quote below)_
- **Extension:** swf _(verified: appears in the quote below)_
- **Format:** Adobe Flash .swf _(verified: appears in the quote below)_

## What the source says

> 43 57 53 | CWS | 0 | swf | Adobe Flash .swf |

## 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/).