ExifTool は、画像、音声、動画、PDFのメタデータの読み取り、書き込み、操作を行うためのフリーでオープンソースのソフトウェアプログラム。プラットフォームに依存せず、Perl ライブラリ（Image::ExifTool）とコマンドラインアプリケーションの両方として利用できる。ExifTool は、さまざまな種類のデジタルワークフローに一般的に組み込まれている Exif、、XMP、JFIF、GeoTIFF、ICCプロファイル、Photoshop IRB、、AFCP、ID3 を含む多くの種類のメタデータや、多くのデジタルカメラのメーカー固有のメタデータ形式などをサポートしている。

 メタ情報のカプセル化 
ExifTool は独自のオープンメタデータ形式を実装している。多くのソースからのメタ情報をバイナリまたはテキスト形式でカプセル化し、あらゆる種類のファイルにバンドルするように設計されている。既存のデータをラップする単一のファイルにすることも、Exif や XMP メタデータなどを運ぶとして使用することもできる。

 ユーザー 
ExifTool を使用する Web サイトとサービスには次のものある：

 
 Flickr (アップロードされた画像からメタデータを解析する)
 
 Metadata++
 XnView
 Exif Fixer (360°パノラマ固有のメタデータを計算し、画像に追加する)

対応ファイル形式
ExifToolは以下の形式のファイルを読み込み、編集、作成することができる：

読み込み

 360 - GoPro 360 video (QuickTime-based)
 3FR - Hasselblad raw (TIFF-based)
 3G2, 3GP2 - 3rd Gen. Partnership Project 2 audio/video (QuickTime-based)
 3GP, 3GPP - 3rd Gen. Partnership Project audio/video (QuickTime-based)
 A - Unix static library code Archive
 AA - Audible Audiobook
 AAE - Apple edit information (XML PLIST-based)
 AAX - Audible Enhanced Audiobook (QuickTime-based)
 ACR - American College of Radiology ACR-NEMA (DICOM-like)
 AFM, ACFM, AMFM - Adobe (Composite/Multiple Master) Font Metrics
 AI, AIT - Adobe Illustrator (Template, PS or PDF)
 AIFF, AIF, AIFC - Audio Interchange File Format (Compressed)
 APE - Monkey's Audio
 ARQ - Sony Alpha Pixel-Shift raw (TIFF-based)
 ARW - Sony Alpha raw (TIFF-based)
 ASF - Microsoft Advanced Systems Format
 AVI - Audio Video Interleaved (RIFF-based)
 AVIF - AV1 Image File Format (QuickTime-based)
 BMP, DIB - Windows BitMaP / Device Independent Bitmap
 BPG - Better Portable Graphics
 BTF - BigTIFF (64-bit Tagged Image File Format)
 CHM - Microsoft Compiled HTML format
 COS - Capture One Settings (XML-based)
 CR2 - Canon Raw 2 (TIFF-based) (CR2 specification)
 CR3 - Canon Raw 3 (QuickTime-based) (CR3 specification)
 CRM - Canon RAW Movie (QuickTime-based)
 CRW, CIFF - Canon Raw Camera Image File Format (CRW specification)
 CS1 - Sinar CaptureShop 1-shot raw (PSD-based)
 CSV - Comma-Separated Values
 CZI - Zeiss Integrated Software RAW (ZISRAW)
 DCM, DC3, DIC, DICM - DICOM - Digital Imaging and Communications in Medicine
 DCP - DNG Camera Profile (DNG-like)
 DCR - Kodak Digital Camera Raw (TIFF-based)
 DFONT - Macintosh Data Fork Font
 DIVX - DivX media format (ASF-based)
 DJVU, DJV - DjVu image (AIFF-like)
 DNG - Digital Negative (TIFF-based)
 DOC, DOT - Microsoft Word Document/Template (FPX-like)
 DOCX, DOCM - Office Open XML Document (Macro-enabled)
 DOTX, DOTM - Office Open XML Document Template (Macro-enabled)
 DPX - Digital Picture Exchange
 DR4 - Canon DPP version 4 Recipe
 DSS, DS2 - Digital Speech Standard
 DYLIB - Mac OS X Mach-O executable and library files
 DV - Digital Video
 DVB - Digital Video Broadcasting (QuickTime-based)
 DVR-MS - Microsoft Digital Video Recording (ASF-based)
 EIP - Capture One Enhanced Image Package (ZIP-based)
 EPS, EPSF, PS - (Encapsulated) PostScript Format
 EPUB - Electronic Publication Format
 ERF - Epson Raw Format (TIFF-based)
 EXE, DLL - DOS/Windows executable and library files
 EXIF - Exchangeable Image File Format metadata (TIFF-based)
 EXR - Open EXR (Extended Range)
 EXV - Exiv2 metadata file (JPEG-based)
 F4A, F4B, F4P, F4V - Adobe Flash Player 9+ Audio/Video (Quicktime-based)
 FFF - Hasselblad Flexible File Format (TIFF-based)
 FFF - FLIR thermal image File Format
 FITS - Flexible Image Transport System
 FLA - Macromedia/Adobe Flash project (FPX-like)
 FLAC - Free Lossless Audio Codec
 FLIF - Free Lossless Image Format
 FLV - Flash Video
 FPF - FLIR Public image Format
 FPX - FlashPix image
 GIF - Compuserve Graphics Interchange Format
 GPR - GoPro Raw (DNG-based)
 GZ, GZIP - GNU ZIP compressed archive
 HDP, WDP, JXR - Windows HD Photo / Media Photo / JPEG XR (TIFF-based)
 HDR - Radiance RGBE (Red Green Blue Exponent) High Dynamic-Range
 HEIC, HEIF, HIF - High Efficiency Image Format (QuickTime-based)
 HTML, HTM, XHTML - (Extensible) HyperText Markup Language
 ICO, CUR - Windows Icon or Cursor
 ICC, ICM - International Color Consortium color profile
 ICS, ICAL - iCalendar Schedule
 IDML - Adobe InDesign Markup Language (ZIP/XML-based)
 IIQ - Phase One Intelligent Image Quality raw (TIFF-based)
 IND, INDD, INDT - Adobe InDesign Document/Template (XMP metadata only)
 INSP - Insta360 Picture (JPEG-based)
 INSV - Insta360 Video (QuickTime-based)
 INX - Adobe InDesign Interchange (XML-based, XMP metadata only)
 ISO - ISO 9660 disk image
 ITC - iTunes Cover Flow artwork
 J2C, J2K, JPC - JPEG 2000 codestream
 JP2, JPF, JPM, JPX - JPEG 2000 image (Compound/Extended)
 JPEG, JPG, JPE - Joint Photographic Experts Group image (see table below)
 JSON - JavaScript Object Notation
 JXL - JPEG XL (Extra longterm)
 K25 - Kodak DC25 raw (TIFF-based)
 KDC - Kodak Digital Camera raw (TIFF-based)
 KEY, KTH - Apple iWork '09 Keynote presentation/Theme
 LA - Lossless Audio (RIFF-based)
 LFP, LFR - Lytro Light Field Picture
 LNK - Microsoft Shell Link (Windows shortcut)
 LRV - Low-Resolution Video (QuickTime-based)
 M2TS, MTS, M2T, TS - MPEG-2 Transport Stream (used for AVCHD video)
 M4A, M4B, M4P, M4V - MPEG-4 Audio/Video (Quicktime-based)
 MACOS - MacOS "._" sidecar file (may have any extension)
 MAX - 3D Studio MAX (FPX-like)
 MEF - Mamiya (raw) Electronic Format (TIFF-based)
 MIE - Meta Information Encapsulation (MIE specification)
 MIFF, MIF - Magick Image File Format
 MKA, MKV, MKS - Matroska Audio/Video/Subtitle
 MOBI, AZW, AZW3 - Mobipocket electronic book (Palm-based)
 MODD - Sony Picture Motion metadata (XML PLIST-based)
 MOI - MOD Information file
 MOS - Creo Leaf Mosaic (TIFF-based)
 MOV, QT - Apple QuickTime Movie
 MP3 - MPEG-1 layer 3 audio (uses ID3 information)
 MP4 - Motion Picture Experts Group version 4 (Quicktime-based)
 MPC - Musepack Audio
 MPEG, MPG, M2V - Motion Picture Experts Group version 1 or 2
 MPO - Extended Multi-Picture format (JPEG with MPF extensions)
 MQV - Sony Mobile QuickTime Video
 MRW - Minolta Raw
 MXF - Material Exchange Format
 NEF - Nikon (raw) Electronic Format (TIFF-based)
 NMBTEMPLATE - Apple iWork '09 Numbers Template
 NRW - Nikon Raw (TIFF-based)
 NUMBERS - Apple iWork '09 Numbers spreadsheet
 O - Unix compiled code Object
 ODB, ODC, ODF, ODG, ODI, ODP, ODS, ODT - Open Document Database/Chart/Formula/Graphics/Image/Presentation/Spreadsheet/Text (ZIP/XML-based)
 OFR - OptimFROG audio (RIFF-based)
 OGG, OGV - Ogg bitstream container
 ONP - ON1 Presets
 OPUS - Ogg Opus audio
 ORF - Olympus Raw Format (TIFF-based)
 OTF - Open Type Font
 PAC - Lossless Predictive Audio Compression (RIFF-based)
 PAGES - Apple iWork '09 Pages document
 PCD - Kodak Photo CD Image Pac
 PCX - PC Paintbrush
 PDB, PRC - Palm Database
 PDF - Adobe Portable Document Format
 PEF - Pentax (raw) Electronic Format (TIFF-based)
 PFA, PFB - PostScript Font ASCII/Binary
 PFM - Printer Font Metrics
 PGF - Progressive Graphics File
 PICT, PCT - Apple Picture file
 PLIST - Apple Property List (binary and XML formats)
 PMP - Sony DSC-F1 Cyber-Shot image
 PNG, JNG, MNG - Portable/JPEG/Multiple-image Network Graphics
 PPM, PBM, PGM - Portable Pixel/Bit/Gray Map
 PPT, PPS, POT - Microsoft PowerPoint Presentation/Slideshow/Template (FPX-like)
 POTX, POTM - Office Open XML Presentation Template (Macro-enabled)
 PPAX, PPAM - Office Open XML Presentation Addin (Macro-enabled)
 PPSX, PPSM - Office Open XML Presentation Slideshow (Macro-enabled)
 PPTX, PPTM - Office Open XML Presentation (Macro-enabled)
 PSD, PSB, PSDT - PhotoShop Drawing / Large Document / Template
 PSP, PSPIMAGE - Paint Shop Pro
 QTIF, QTI, QIF - QuickTime Image File
 R3D - Redcode raw video
 RA - RealAudio
 RAF - FujiFilm Raw Format
 RAM, RPM - RealAudio/Plug-in Metafile
 RAR - RAR Archive
 RAW - Kyocera Contax N Digital Raw
 RAW - Panasonic Raw (TIFF-based)
 RIFF, RIF - Resource Interchange File Format
 RM, RV, RMVB - Real Media/Video (Variable Bitrate)
 RSRC - Mac OS Resource
 RTF - Rich Text Format
 RW2 - Panasonic Raw 2 (TIFF-based)
 RWL - Leica Raw (TIFF-based)
 RWZ - Rawzor compressed image
 SEQ - FLIR Systems image Sequence
 SKETCH - Sketch design file
 SO - Unix ELF executable and Shared Object files
 SR2 - Sony Raw 2 (TIFF-based)
 SRF - Sony Raw Format (TIFF-based)
 SRW - Samsung Raw format (TIFF-based)
 SVG - Scalable Vector Graphics (XML-based)
 SWF - Shockwave Flash
 THM - Canon Thumbnail (JPEG)
 THMX - Office Open XML Theme
 TIFF, TIF - Tagged Image File Format
 TTF, TTC - True Type Font/Collection
 TORRENT - BitTorrent description file
 TXT - Text files
 VCF, VCARD - Virtual Card
 VOB - Video Object (MPEG-based)
 VRD - Canon DPP Recipe Data
 VSD - Microsoft Visio Drawing (FPX-like)
 WAV - Windows digital audio WAVeform (RIFF-based)
 WEBM - Google Web Movie (MKV-based)
 WEBP - Google Web Picture (RIFF-based)
 WMA, WMV - Windows Media Audio/Video (ASF-based)
 WTV - Windos recorded TV show
 WV - WavePack lossless audio (RIFF-based)
 X3F - Sigma/Foveon raw
 XCF - GIMP native image format
 XLS, XLT - Microsoft Excel Spreadsheet/Template (FPX-like)
 XLSX, XLSM, XLSB - Office Open XML Spreadsheet (Macro-enabled/Binary)
 XLTX, XLTM - Office Open XML Spreadsheet Template (Macro-enabled)
 XMP - Extensible Metadata Platform sidecar file
 ZIP - ZIP archive

編集

 360 - GoPro 360 video (QuickTime-based)
 3G2, 3GP2 - 3rd Gen. Partnership Project 2 audio/video (QuickTime-based)
 3GP, 3GPP - 3rd Gen. Partnership Project audio/video (QuickTime-based)
 AAX - Audible Enhanced Audiobook (QuickTime-based)
 AI, AIT - Adobe Illustrator (Template, PS or PDF)
 ARQ - Sony Alpha Pixel-Shift raw (TIFF-based)
 ARW - Sony Alpha raw (TIFF-based)
 AVIF - AV1 Image File Format (QuickTime-based)
 CR2 - Canon Raw 2 (TIFF-based) (CR2 specification)
 CR3 - Canon Raw 3 (QuickTime-based) (CR3 specification)
 CRM - Canon RAW Movie (QuickTime-based)
 CRW, CIFF - Canon Raw Camera Image File Format (CRW specification)
 CS1 - Sinar CaptureShop 1-shot raw (PSD-based)
 DCP - DNG Camera Profile (DNG-like)
 DNG - Digital Negative (TIFF-based)
 DR4 - Canon DPP version 4 Recipe
 DVB - Digital Video Broadcasting (QuickTime-based)
 EPS, EPSF, PS - (Encapsulated) PostScript Format
 ERF - Epson Raw Format (TIFF-based)
 EXIF - Exchangeable Image File Format metadata (TIFF-based)
 EXV - Exiv2 metadata file (JPEG-based)
 F4A, F4B, F4P, F4V - Adobe Flash Player 9+ Audio/Video (Quicktime-based)
 FFF - Hasselblad Flexible File Format (TIFF-based)
 FLIF - Free Lossless Image Format
 GIF - Compuserve Graphics Interchange Format
 GPR - GoPro Raw (DNG-based)
 HDP, WDP, JXR - Windows HD Photo / Media Photo / JPEG XR (TIFF-based)
 HEIC, HEIF, HIF - High Efficiency Image Format (QuickTime-based)
 ICC, ICM - International Color Consortium color profile
 IIQ - Phase One Intelligent Image Quality raw (TIFF-based)
 IND, INDD, INDT - Adobe InDesign Document/Template (XMP metadata only)
 INSP - Insta360 Picture (JPEG-based)
 JP2, JPF, JPM, JPX - JPEG 2000 image (Compound/Extended)
 JPEG, JPG, JPE - Joint Photographic Experts Group image (see table below)
 JXL - JPEG XL (Extra longterm)
 LRV - Low-Resolution Video (QuickTime-based)
 M4A, M4B, M4P, M4V - MPEG-4 Audio/Video (Quicktime-based)
 MEF - Mamiya (raw) Electronic Format (TIFF-based)
 MIE - Meta Information Encapsulation (MIE specification)
 MOS - Creo Leaf Mosaic (TIFF-based)
 MOV, QT - Apple QuickTime Movie
 MP4 - Motion Picture Experts Group version 4 (Quicktime-based)
 MPO - Extended Multi-Picture format (JPEG with MPF extensions)
 MQV - Sony Mobile QuickTime Video
 MRW - Minolta Raw
 NEF - Nikon (raw) Electronic Format (TIFF-based)
 NRW - Nikon Raw (TIFF-based)
 ORF - Olympus Raw Format (TIFF-based)
 PDF - Adobe Portable Document Format
 PEF - Pentax (raw) Electronic Format (TIFF-based)
 PNG, JNG, MNG - Portable/JPEG/Multiple-image Network Graphics
 PPM, PBM, PGM - Portable Pixel/Bit/Gray Map
 PSD, PSB, PSDT - PhotoShop Drawing / Large Document / Template
 QTIF, QTI, QIF - QuickTime Image File
 RAF - FujiFilm Raw Format
 RAW - Panasonic Raw (TIFF-based)
 RW2 - Panasonic Raw 2 (TIFF-based)
 RWL - Leica Raw (TIFF-based)
 SR2 - Sony Raw 2 (TIFF-based)
 SRW - Samsung Raw format (TIFF-based)
 THM - Canon Thumbnail (JPEG)
 TIFF, TIF - Tagged Image File Format
 VRD - Canon DPP Recipe Data
 WEBP - Google Web Picture (RIFF-based)
 X3F - Sigma/Foveon raw
 XMP - Extensible Metadata Platform sidecar file

作成
 DR4 - Canon DPP version 4 Recipe
 EXIF - Exchangeable Image File Format metadata (TIFF-based)
 EXV - Exiv2 metadata file (JPEG-based)
 ICC, ICM - International Color Consortium color profile
 MIE - Meta Information Encapsulation (MIE specification)
 VRD - Canon DPP Recipe Data
 XMP - Extensible Metadata Platform sidecar file

 対応JPEGメタデータ 
ExifTool は、JPEG 画像の以下の種類のメタデータを読み込み、編集、作成することができる：
JPEG メタ情報 読み込み可能 編集可能 作成可能 説明APP0 - JFIF Yes JPEG File Interchange FormatAPP0 - JFXX Yes Extended JFIFAPP0 - CIFF Yes Camera Image File Format (used by some Canon models)APP0 - AVI1 Yes JPEG AVI informationAPP0 - Ocad Yes Photobucket Ocad segmentAPP1 - EXIF Yes Exchangeable Image File Format (including maker notes)APP1 - XMP Yes Extensible Metadata Platform (multi-segment)APP1 - QVCI Yes Casio QV-7000SX QVCI informationAPP1 - FLIR Yes FLIR thermal imaging data (multi-segment)APP1 - RawThermalImage Yes Thermal image from Parrot Bebop-Pro Thermal droneAPP2 - ICC Yes International Color Consortium (multi-segment)APP2 - FPXR Yes FlashPix Ready (multi-segment)APP2 - MPF Yes Multi-Picture FormatAPP2 - PreviewImage Yes Samsung APP2 preview image (multi-segment)APP3 - Kodak Meta Yes Kodak Meta information (Exif-like)APP3 - Stim Yes Stereo Still Image formatAPP3 - PreviewImage Yes Samsung/HP preview image (multi-segment)APP4 - Scalado Yes (presumably written by Scalado mobile software)APP4 - FPXR Yes FlashPix Ready in non-standard location (multi-segment)APP4 - PreviewImage Yes (continued from APP3)APP5 - Ricoh RMETA Yes Ricoh custom fieldsAPP5 - Samsung UniqueID Yes Samsung Unique IDAPP5 - PreviewImage Yes (continued from APP4)APP6 - EPPIM Yes Toshiba PrintIMAPP6 - NITF Yes National Imagery Transmission FormatAPP6 - HP TDHD Yes Hewlett-Packard Photosmart R837 TDHD informationAPP6 - GoPro Yes GoPro Metadata Format (GPMF) informationAPP7 - Pentax Yes Pentax APP7 maker notesAPP7 - Qualcomm Yes Qualcomm Camera AttributesAPP8 - SPIFF Yes Still Picture Interchange File FormatAPP9 - Media Jukebox Yes Media Jukebox XML informationAPP10 - Comment Yes PhotoStudio Unicode CommentAPP11 - JPEG-HDR Yes JPEG-HDR compressed ratio imageAPP12 - Picture Info Yes ASCII-based Picture InformationAPP12 - Ducky Yes Photoshop "Save for Web"APP13 - Photoshop IRB Yes Image Resource Block (multi-segment, includes IPTC)APP13 - Adobe CM Yes Adobe Color ManagementAPP14 - Adobe Yes Adobe DCT filterAPP15 - GraphicConverter Yes GraphicConverter qualityCOM Yes JPEG Comment (multi-segment)DQT Yes (used to calculate the Extra:JPEGDigest tag value)SOF Yes JPEG Start Of FrameAFCP trailer Yes AXS File Concatenation Protocol (includes IPTC)CanonVRD trailer Yes Canon DPP Recipe DataFotoStation trailer Yes FotoWare FotoStation (includes IPTC)PhotoMechanic trailer Yes Camera Bits Photo MechanicMIE trailer Yes Meta Information EncapsulationSamsung trailer Yes Samsung Galaxy trailerPreviewImage trailer Yes (preview image written after JPEG EOI)EmbeddedVideo trailer Yes (extracted only with ExtractEmbedded option)