Magic Number Lookup
Identify files by magic bytes
Free online magic number lookup. Identify file types by their magic bytes or inspect a file directly.
How to use Magic Number Lookup
- Paste hex bytes or choose a file.
- Click Lookup.
- See the matched file type.
Features
- 45+ file signatures
- File inspector
- Hex input
- Free online tool, no signup needed to view
Frequently asked questions
What are magic numbers?
The first bytes of a file that identify its format — e.g. PNG files start with 89 50 4E 47.
Is my file uploaded?
No. Only the first 32 bytes are read locally in your browser — nothing leaves your device.
Is it free?
Yes, completely free with no signup required to view the page. Login to use the tool without limits.
Login to use this free online tool. Create a free account to get started.
