Encoding utility

ASCII ↔ HEX Converter

Convert ASCII text into a hex byte sequence (or back). Choose your preferred separator. ASCII characters (0x20–0x7E) only — for multi-byte characters use the UTF-8 inspector.

Client-sideCopy-friendly0x20–0x7E

Input

ASCII text or hex bytes (depending on direction).

Direction: Separator:

Result

Type something to convert.

All conversion runs locally.

When to use this

For embedding strings into APDUs, building NDEF payloads, or converting between log captures and source code.

Multi-byte text?

For UTF-8 / Unicode use the UTF-8 inspector.

UTF-8 inspector →

Programmer formats?

For C / Java / Python / JS byte-array literals use HEX ↔ Bytes.

HEX ↔ Bytes →

Companion tool

Building APDUs?

APDU parser →