Byte Order Mark Detector

Inspect the leading bytes locally, report the BOM type and length, and distinguish no-BOM data without uploading files.

Leading bytes (hex)Or inspect a local file

—Detected BOM

—BOM bytes

—Signature

ReadyA BOM is only a leading signature. No BOM does not by itself identify the file's encoding.

These tools operate on bytes and Unicode text locally. “Text to hex/binary/decimal” means the UTF-8 encoding of the text, not the numeric Unicode code point unless a tool explicitly says code point.

Leading-byte signature audit

Inspect the first bytes directly and distinguish UTF-8, UTF-16 and UTF-32 BOM signatures from ordinary text. The detector does not guess the full encoding when no BOM exists.

—BOM signature

—BOM bytes

—Leading bytes

Ready.

A BOM is a leading byte signature, not general encoding detection

The detector identifies common UTF BOM byte prefixes only. “No BOM” does not prove an encoding.