# Clang pre-compiled header — file signature 43 50 43 48 at offset 0

For Clang pre-compiled header, hex signature is 43 50 43 48; offset is 0; extension is pch, verified against its source on 2026-09-22.

- **Hex signature:** 43 50 43 48 _(verified: appears in the quote below)_
- **Offset:** 0 _(verified: appears in the quote below)_
- **Extension:** pch _(verified: appears in the quote below)_
- **Format:** Clang pre-compiled header _(verified: appears in the quote below)_

## What the source says

> 43 50 43 48 | CPCH | 0 | pch | Clang pre-compiled header |

## 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/).