Decimal to Hexadecimal Converter Online
Hexadecimal is the compact base-16 notation used for colour codes, memory addresses and byte values. Enter a decimal number to get its hex equivalent in both lowercase and uppercase.
Runs in your browser — your text is never uploaded or stored.
Decimal number
Hexadecimal result
How to Use
- 1.Enter your decimal number.
- 2.Read the hexadecimal value below, in both cases.
- 3.Copy the format your code or design tool expects.
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FAQ
Why is 255 equal to FF?
Hexadecimal digits run 0-9 then A-F, so two hex digits cover 0 to 255 exactly — which is why one byte is always two hex characters.
Should I use uppercase or lowercase hex?
Both are valid. CSS colour codes are commonly uppercase, while many programming style guides prefer lowercase.
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