---
type: lookup
id: z-tar-z-1f-9d
asset: file-format-signatures
title: "1F 9D — File format magic numbers"
sources:
  - https://en.wikipedia.org/wiki/List_of_file_signatures
source_quote: "compressed file (often <https://en.wikipedia.org/wiki/Tar_(file_format)> tar zip) using <https://en.wikipedia.org/wiki/Lempel-Ziv-Welch> Lempel-Ziv-Welch algorithm"
generated: true
verified: false
harvested: 2026-08-03
stale_after: 2027-08-03
hex_signature: "1F 9D"
offset: "0"
extension: "z tar.z"
format: "compressed file (often tar zip) using Lempel-Ziv-Welch algorithm"
unverified_fields: extension, format, hex_signature, offset
---
**Hex signature:** 1F 9D

**Offset:** 0

**Extension:** z tar.z

**Format:** compressed file (often tar zip) using Lempel-Ziv-Welch algorithm

> compressed file (often <https://en.wikipedia.org/wiki/Tar_(file_format)> tar zip) using <https://en.wikipedia.org/wiki/Lempel-Ziv-Welch> Lempel-Ziv-Welch algorithm

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