Comment utiliser : Hex to Decimal Converter
- Type the hex value — with or without 0x — in the hexadecimal field.
- Read the decimal, binary and octal values, updated as you type.
- Type in the decimal field to convert the other way.
How hex to decimal works
Hexadecimal is base 16: the digits 0–9 and the letters A–F (10–15). Each position is worth 16 times the one to its right. 1A3F = 1×4096 + 10×256 + 3×16 + 15×1 = 6,719. Two hex digits make exactly one byte, which is why hex is used for colors (#FF8800), memory addresses and byte dumps.
Large numbers and negative values
The converter uses arbitrary-precision integers, so 64-bit and larger values convert exactly — no rounding as in a regular calculator. For signed values, the two’s-complement view shows how a value like FFFFFFFF reads as −1 in a 32-bit signed integer.
Quick reference
0xFF = 255 · 0x100 = 256 · 0xFFFF = 65,535 · 0x7FFFFFFF = 2,147,483,647 (largest signed 32-bit integer).
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Outils complémentaires : Hex to Decimal Converter
- Number Base Converter — Type a number in any base and see it in all the others instantly.
- HEX to RGBA Converter — Paste a HEX code, drag the opacity slider and copy the exact CSS you need — legacy rgba(), modern rgb( / alpha) or 8-digit HEX.
- Binary to Text Converter — Paste binary code — groups of eight 0s and 1s, or one long string — and read it as text.
- Convertisseur de texte en binaire — Saisissez du texte pour le visualiser sous forme de code binaire, ou collez du code binaire (ou hexadécimal, octal, décimal) pour le reconvertir en texte lisible.