## ZIP Tags

The following tags are extracted from ZIP archives. ExifTool also extracts additional meta information from compressed documents inside some ZIP-based files such as DOCX, PPTX, XLSX (Office Open XML) and EIP (Capture One Enhanced Image Package). The ExifTool family 3 groups may be used to organize the output by embedded document number (ie. the exiftool `-g3` option).

> Index | Tag Name | Writable | Values / Notes
> --- | --- | --- | ---
> 2 | ZipRequiredVersion | N |
> 3 | ZipBitFlag | N |
> 4 | ZipCompression | N | 0 = None 1 = Shrunk 2 = Reduced with compression factor 1 3 = Reduced with compression factor 2 4 = Reduced with compression factor 3 5 = Reduced with compression factor 4 6 = Imploded 7 = Tokenized 8 = Deflated 9 = Enhanced Deflate using Deflate64(tm) 10 = Imploded (old IBM TERSE) 12 = BZIP2 14 = LZMA (EFS) 18 = IBM TERSE (new) 19 = IBM LZ77 z Architecture (PFS) 96 = JPEG recompressed 97 = WavPack compressed 98 = PPMd version I, Rev 1
> 5 | ZipModifyDate | N |
> 7 | ZipCRC | N |
> 9 | ZipCompressedSize | N |
> 11 | ZipUncompressedSize | N |
> 15 | ZipFileName | N |

## ZIP GZIP Tags

These tags are extracted from GZIP (GNU ZIP) archives, but currently only for the first file in the archive.

> Index | Tag Name | Writable | Values / Notes
> --- | --- | --- | ---
> 2 | Compression | N | 8 = Deflated
> 3 | Flags | N | Bit 0 = Text Bit 1 = CRC16 Bit 2 = ExtraFields Bit 3 = FileName Bit 4 = Comment
> 4 | ModifyDate | N |
> 8 | ExtraFlags | N | 0 = (none) 2 = Maximum Compression 4 = Fastest Algorithm
> 9 | OperatingSystem | N | 0 = FAT filesystem (MS-DOS, OS/2, NT/Win32) 1 = Amiga 2 = VMS (or OpenVMS) 3 = Unix 4 = VM/CMS 5 = Atari TOS 6 = HPFS filesystem (OS/2, NT) 7 = Macintosh 8 = Z-System 9 = CP/M 10 = TOPS-20 11 = NTFS filesystem (NT) 12 = QDOS 13 = Acorn RISCOS 255 = unknown
> 10 | ArchivedFileName | N |
> 11 | Comment | N |

(This document generated automatically by Image::ExifTool::BuildTagLookup)
Last revised Nov 5, 2009

<-- ExifTool Tag Names