Why use hex instead of decimal?

One hex digit encodes four bits, two digits encode a byte. Memory dumps, MAC addresses, cryptographic hashes, opcodes, and CSS colors are byte-oriented, so hex keeps the bit structure visible and cuts character count against decimal. 0xFF and 11111111 show the same structure; 255 hides it.

Is hex case-sensitive?

No. 0xAB and 0xab are the same value. Output defaults to uppercase for traditional hex-dump style, but Rust, Go, and most REST APIs favor lowercase.

What does the 0x prefix mean?

It tells the reader hex, not decimal. C, Python, and JavaScript require it at the language level. The tools accept input with or without it; output is always prefixed for clarity.

Binary-Coded Decimal packs each decimal digit as a 4-bit group, so 25 becomes 0010 0101, not the pure binary 00011001. RTC chips (DS1307, DS3231) and some industrial protocols use it. Standard binary-to-hex gives the wrong number; BCD to Hex reads each nibble as a decimal digit first.

How is Base58 different from Base64?

Base58 drops the visually ambiguous characters 0, O, I, l, plus the + and / that Base64 uses (both break URLs and shell commands). The 58-character alphabet is safe for printing wallet addresses by hand; Bitcoin and Solana use Base58Check.

Are my inputs sent to a server?

No. All eight tools run client-side in JavaScript. The browser network tab confirms no request leaves the page.

Hex Tools

Hex tools cover the gaps between hexadecimal and every other base a programmer meets on a given day: decoding a Base64 payload to read the raw bytes, turning a Bitcoin address from Base58 into hex for verification, reading a BCD clock register off an embedded datasheet, or adding two 32-bit values by hand when a debugger is not yet attached. 29 browser-based utilities, all client-side, all free.

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Add Hex Numbers →

ASCII to Hex Converter →

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Calculate Bitwise AND of Hexadecimal Numbers →

Convert Decimal to Hex →

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Convert Hex to Octal →

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Convert Hex to Roman Numeral →

Convert Hex to String →

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Convert Hex to UTF-8 →

Convert IP to Hex →

Convert Octal to Hex →

Convert RGB to Hex →

Convert Roman Numeral to Hex →

Convert String to Hex →

Convert Text to Hex →

Convert UTF-8 to Hex →

NAND Hex Numbers Calculator →

NOR Hex Numbers Calculator →

OR Hex Numbers Calculator →

XOR Hex Numbers Calculator →

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