10進数からASCIIテキストへ変換 Converter

To convert decimal codes to ASCII text, each decimal integer (such as 72, 101, 108, 108, 111) is mapped to its matching 7-bit character in the standard ASCII table. For example, decimal 72 maps to the uppercase letter 'H', 101 maps to 'e', 108 maps to 'l', and 111 maps to 'o', translating the decimal sequence 72 101 108 108 111 into 'Hello'.

This tool automatically detects common separators including spaces, commas, semicolons, line breaks, tabs, and pipes. You can also manually choose specific delimiters (e.g. Space, Comma, Comma+Space, Newline) or unseparated continuous digits (No delimiter mode with automatic 2/3 digit chunking).

Standard ASCII uses 7 bits (codes 0 to 127) to represent 128 characters, including English letters (A-Z, a-z), digits (0-9), punctuation, and control characters (like newline and tab). Extended ASCII uses 8 bits (codes 128 to 255) to represent regional accented characters, mathematical symbols, and box-drawing glyphs under encodings such as ISO-8859-1 (Latin-1) and Windows-1252.

Decimal numbers from 0 to 31 and decimal 127 are ASCII Control Characters (such as NUL, Bell, Backspace, Line Feed, Carriage Return, and Escape). These characters perform system and communication commands rather than displaying visible glyphs. Our tool highlights control codes in the character diagnostics breakdown.

Yes. You can upload .txt files, paste large multi-line decimal dumps, copy decoded output with one click, or export the resulting ASCII text as a downloadable file directly in your browser without sending any data to external servers.

You can click the Swap (⇄) button in the calculator interface to switch to reverse mode (ASCII Text to Decimal), or visit our companion converter to generate decimal byte codes from any text string.