BCD to Hexadecimal Converter Online Free Tool
Convert BCD to hexadecimal - value conversion or nibble mode, COMP-3 sign, BigInt precision. Free, client-side, instant, offline, secure.
Turn Binary-Coded Decimal into hexadecimal. Two interpretations: convert the BCD value to hex, or re-render each nibble as a hex digit. Accepts binary or hex-BCD input, handles IBM COMP-3 sign nibbles, BigInt precision for arbitrary lengths.
How to Use BCD to Hexadecimal Converter Online Free Tool
- Paste BCD values, one per line. Binary (
0001 0010), hex (12), or hex with prefix (0x12) are all accepted - each line is independently auto-detected. - Choose the conversion interpretation. Value conversion is what most people mean by “BCD to hex”: read the BCD as a decimal number, output that number in hex. Nibble pass-through is a re-display - each 4-bit BCD chunk becomes its hex character.
- Pick a case and prefix. Uppercase hex is common in protocol specs and memory dumps; lowercase matches modern language conventions. Drop the
0xprefix if you’re copying into a tool that parses bare hex. - Turn on COMP-3 for mainframe data: the final nibble encodes sign (
C/F= positive,D= negative) and is not a digit. A negative value gets a-prefix in the output. - Watch the stats line for a breakdown: number of lines · nibble count · digit count · validity summary · signed line count · active mode.
- Handle errors per-line. Bad input (a nibble > 9 in unsigned mode, non-binary chars in binary mode, etc.) produces an inline
ERROR: ...in the output at the matching line, with the offending nibble and position named. Other lines still decode cleanly. - Copy or download. Copy writes the output to clipboard; Download saves
bcd-hexadecimal-<timestamp>.txt. PressCtrl+Enter/Cmd+Enterto convert + copy in one keystroke.
Frequently Asked Questions
What does BCD to hexadecimal mean?
It takes a Binary-Coded Decimal value and outputs its hexadecimal equivalent. BCD stores decimal digits in 4-bit groups, while hex uses 4-bit groups that represent 0-F, so the conversion is a value translation.
What is the difference between value conversion and nibble mode?
Value conversion decodes the BCD digits into a decimal number, then formats that number as hex. Nibble mode shows the raw bytes as hex without interpreting them as a decimal value.
Does COMP-3 sign handling work here?
Yes. The tool understands the COBOL COMP-3 convention where the last nibble (C, D, or F) indicates the sign, and produces signed hex output accordingly.
Why does BigInt matter?
BCD values commonly span 12 or more decimal digits in financial systems. BigInt preserves every digit exactly instead of losing precision the way 64-bit floating-point would.
Is my data secure?
Yes. Processing happens entirely client-side. Your BCD inputs and hex outputs never leave your browser.
Do you store anything?
No. The tool logs nothing about your data, and nothing is transmitted or cached.
Is the tool free?
Yes, with no account requirement and no quota.
Can I pick hex letter case?
Yes. The output supports lowercase (a-f) and uppercase (A-F) through a simple toggle.
What about invalid BCD inputs?
Invalid nibbles (outside 0-9 when not in a sign position) are flagged with byte and nibble positions so you can fix them.
Is there a batch mode?
Yes. Enter one BCD value per line and get a lined-up hex output, ready for copy or download as a text file.