File Signature Checker
Analyse a file directly in your browser and verify whether its extension matches the real format. Currently detects 43 formats. Files are never uploaded.
A. Pick a file
Only the first 512 bytes are read inside your browser. Nothing is uploaded.
B. Paste hex bytes
Example: 89 50 4E 47 0D 0A 1A 0A
Supported formats (43)
- PDFapplication/pdf
- PNGimage/png
- JPEGimage/jpeg
- GIF (GIF87a)image/gif
- GIF (GIF89a)image/gif
- WebPimage/webp
- HEIC / HEIFimage/heic
- AVIFimage/avif
- BMPimage/bmp
- TIFF (Little Endian)image/tiff
- TIFF (Big Endian)image/tiff
- ICOimage/x-icon
- Adobe Photoshopimage/vnd.adobe.photoshop
- ZIP (含む docx / xlsx / pptx / apk / jar / odt / epub)application/zip
- GZIPapplication/gzip
- 7-Zipapplication/x-7z-compressed
- RAR (v1.5 – v4.x)application/vnd.rar
- RAR (v5)application/vnd.rar
- tar (ustar)application/x-tar
- XZapplication/x-xz
- BZip2application/x-bzip2
- MP3 (ID3v2)audio/mpeg
- FLACaudio/flac
- Oggaudio/ogg
- WAVaudio/wav
- AVIvideo/x-msvideo
- MP4 / M4V / M4Avideo/mp4
- Matroska / WebMvideo/x-matroska
- ELF 実行ファイルapplication/x-elf
- Windows 実行ファイル (PE)application/vnd.microsoft.portable-executable
- Mach-O (LE 32-bit)application/x-mach-binary
- Mach-O (LE 64-bit)application/x-mach-binary
- Java Classapplication/java-vm
- SQLite データベースapplication/vnd.sqlite3
- PostScriptapplication/postscript
- RTFapplication/rtf
- 旧 Office 文書 (Compound File Binary)application/x-cfb
- LHA / LZHapplication/x-lzh-compressed
- CHM (Compiled HTML Help)application/vnd.ms-htmlhelp
- StuffIt Xapplication/x-stuffit
- JPEG XL (container)image/jxl
- JPEG XL (codestream)image/jxl
- Apple binary plist (.webarchive 等)application/x-webarchive