File Magic Bytes Signature & MIME Type Inspector
Processed in your browser
Inspect file binary headers and magic number bytes to accurately detect genuine file format and MIME type regardless of extension.
Select Any Local File
Only the first 64 bytes are read into browser memory. No files are uploaded to any server.
Identified Format & MIME Type
Detected Format:
Awaiting File
MIME Type:
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Header Hex Dump (First 32 Bytes)
Upload a file above to inspect byte stream.
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Direct In-Browser Handoff
Data Parsing & Structure Analysis
Chain this tool with complementary private browser utilities for a complete zero-server workflow:
Helpful Examples
PNG Image Magic Bytes
Detects '89 50 4E 47' (‰PNG) header signature.
File: demo.pngHow to Use the File Magic Bytes Signature & MIME Type Inspector
Forensics file signature and MIME type inspector. Reads initial byte arrays in-browser to identify magic numbers for JPEG (FF D8 FF), PNG (89 50 4E 47), PDF (%PDF), ZIP/JAR (PK), WebP, GIF, and executable binaries.
Privacy & Data Processing Notice
No user data leaves your browser. Computation is executed entirely on your device. We do not store, view, or transmit your inputs over our network. Your computation remains on your personal machine.
Frequently Asked Questions
What are magic bytes?
Magic bytes are specific leading hexadecimal sequence signatures embedded at the beginning of a file that reliably indicate its true binary format.
Can this identify spoofed file extensions?
Yes. If an executable or archive is renamed with a '.jpg' extension, the magic bytes scanner will immediately expose the underlying file format.
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