Numbers & Bases

Convert between number bases and text encodings: binary, decimal, hex, and octal, in both directions.

10 free numbers & bases tools, no signup.

• Binary to Decimal ConverterConvert binary to decimal, plus hexadecimal and octal. Exact big-integer conversion that handles very long binary numbers without rounding.
• Binary to Text ConverterDecode 8-bit binary to text with UTF-8. Handles spaced or unspaced groups, private and browser-based.
• Decimal to Binary ConverterConvert decimal numbers to binary, hex, and octal instantly. Exact big-integer math, works with negative and very large numbers.
• Decimal to Text ConverterConvert decimal ASCII and UTF-8 byte values back into text. Accepts space, comma, or line separated numbers.
• Hex to Decimal ConverterConvert hexadecimal to decimal, binary, and octal. Accepts the 0x prefix and negative values, with exact big-integer math.
• Hex to Text ConverterConvert hexadecimal bytes back into readable text. UTF-8 aware, works with or without spaces between byte pairs.
• Number Base ConverterConvert numbers between any bases from 2 to 36, including binary, octal, decimal, and hex. Exact and private.
• Text to Binary ConverterConvert text to 8-bit binary using UTF-8 byte encoding. Fast, private, and runs entirely in your browser.
• Text to Decimal ConverterConvert text to decimal ASCII and UTF-8 byte values, with a choice of separator. Reversible with the decimal to text tool.
• Text to Hex ConverterConvert text to hexadecimal, one byte at a time. UTF-8 aware, with upper or lower case and a choice of byte separator.