Decimal to Hex

Tool processing runs in your browser — your pastes/files are not uploaded to our servers for processing. Ads (if shown) load separately and do not receive your tool inputs.Advertising · Details

Quick answer

To convert decimal to hexadecimal, divide by 16 repeatedly and read the remainders (10–15 → A–F) from last to first — for example 255 → FF. TryDevSnip's converter does it instantly and exactly, even for very large values, all in your browser.

Open decimal → hex converter

Decimal to hex chart

Decimal	Hex
10	A
15	F
16	10
31	1F
100	64
128	80
255	FF
256	100
1000	3E8
65535	FFFF

Reverse or related: hex to decimal · decimal to binary · binary to decimal · all bases

Worked example: 255

Every positional number system works the same way — each digit is multiplied by the base raised to its position, counting from zero on the right. For 255 in decimal:

Digit	Place	Weight	Contribution
2	10²	100	200
5	10¹	10	50
5	10⁰	1	5
Total (decimal)			255

Written in hexadecimal that is 0xFF.

Quick reference

Decimal	decimal	hexadecimal
1	1	1
2	2	2
4	4	4
8	8	8
10	10	A
16	16	10
32	32	20
64	64	40
100	100	64
128	128	80
255	255	FF
256	256	100

Things that trip people up

Prefixes are notation, not value. 0b1010,0o12, 0xA and 10 can all denote the same quantity. Strip the prefix before parsing, or tell the parser which base you meant.
Leading zeros can change the base. In several languages a leading0 historically meant octal, so 010 parsed as 8 rather than 10. Passing an explicit radix avoids the whole class of bug.
Hex letters are case-insensitive. 0xff and0xFF are the same number; only presentation differs.
Grouping is for humans. Binary is usually read in nibbles of four (1111 1111) because each nibble maps to exactly one hex digit — which is why hex is the usual shorthand for binary data.

Frequently asked questions

How do I convert decimal to hex?

Divide the number by 16 repeatedly, writing down the remainders (10–15 become A–F) from last to first. For example 255 ÷ 16 = 15 r15 → FF. Or paste it into the converter and read the hex instantly.

What is 255 in hex?

255 (decimal) is FF in hexadecimal — two hex digits, the maximum value of one byte.

Do I get an uppercase or lowercase hex result?

The converter shows uppercase hex (FF). Hex is case-insensitive, so ff and FF are the same value — lowercase it if your code style requires.

Is my input uploaded?

No. TryDevSnip converts locally in your browser. Nothing you type is uploaded to our servers for processing.

Decimal	decimal	hexadecimal
1	1	1
2	2	2
4	4	4
8	8	8
10	10	A
16	16	10
32	32	20
64	64	40
100	100	64
128	128	80
255	255	FF
256	256	100

Decimal	decimal	hexadecimal
1	1	1
2	2	2
4	4	4
8	8	8
10	10	A
16	16	10
32	32	20
64	64	40
100	100	64
128	128	80
255	255	FF
256	256	100

Decimal	decimal	hexadecimal
1	1	1
2	2	2
4	4	4
8	8	8
10	10	A
16	16	10
32	32	20
64	64	40
100	100	64
128	128	80
255	255	FF
256	256	100