Here is a list of some common file signatures (file magic numbers) and their associated file extensions. This list includes the top 50 file types based on popularity and usage. Keep in mind that this is not an exhaustive list, and there are many other file types with their own unique signatures.
- JPEG/JPG: FF D8 FF
- PNG: 89 50 4E 47 0D 0A 1A 0A
- GIF: 47 49 46 38 39 61
- PDF: 25 50 44 46 2D
- ZIP: 50 4B 03 04
- DOCX: 50 4B 03 04 14 00 06 00
- XLSX: 50 4B 03 04 14 00 06 00
- PPTX: 50 4B 03 04 14 00 06 00
- MP3: 49 44 33
- WAV: 52 49 46 46
- MP4: 00 00 00 18 66 74 79 70
- AVI: 52 49 46 46
- MOV: 00 00 00 14 66 74 79 70
- MKV: 1A 45 DF A3
- BMP: 42 4D
- TIFF/TIF: 49 49 2A 00 or 4D 4D 00 2A
- ICO: 00 00 01 00
- EXE: 4D 5A
- DLL: 4D 5A
- XML: 3C 3F 78 6D 6C 20
- HTML: 3C 21 44 4F 43 54 59 50 45 20 68 74 6D 6C 3E
- CSS: 2F 2A 20 43 53 53 20 2A 2F
- JSON: 7B 22 74 79 70 65 22 3A 22
- SQL: 53 45 4C 45 43 54
- JPG2000: 00 00 00 0C 6A 50 20 20
- FLV: 46 4C 56 01
- RAR: 52 61 72 21 1A 07 00
- GZ: 1F 8B 08
- 7Z: 37 7A BC AF 27 1C
- APK: 50 4B 03 04 14 00 00 08 00
- WMV: 30 26 B2 75 8E 66 CF 11 A6 D9 00 AA 00 62 CE 6C
- WMA: 30 26 B2 75 8E 66 CF 11 A6 D9 00 AA 00 62 CE 6C
- WOFF: 77 4F 46 46 00 01 00 00
- SVG: 3C 73 76 67 20 78 6D 6C 6E 73 3D 22 68 74 74
- PSD: 38 42 50 53
- OTF: 4F 54 54 4F 00
- ICO: 00 00 01 00
- EOT: 4C 50
- AI: 25 50 44 46 2D 31 2E 36
- EPS: 25 21 50 53 2D 41 64 6F 62 65 2D 33 2E 30
- SWF: 46 57 53
- TTF: 00 01 00 00 00
- OGG: 4F 67 67 53
- AVCHD: 00 00 00 20 66 74 79 70 33 67 70 35
- FLAC: 66 4C 61 43
- M4A: 00 00 00 20 66 74 79 70 4D 34 41 20
- AAC: FF F1
- WEBP: 52 49 46 46 00 00 00 00 57 45 42 50
- M4V: 00 00 00 20 66 74 79 70 4D 34 56 20
- AMR:23 21 41 4D 52 0A
Please note that file signatures can vary depending on the specific file format, version, or compression used. This list provides common signatures, but it’s always recommended to consult the file format specifications for accurate and up-to-date information.