If this tool helped you, you can buy us a coffee ☕
Free online tool for two-way conversion between text and ASCII (decimal) codes. Ideal for programming, debugging, and data transmission.
Text to ASCII Art Generator
Convert plain text into visual ASCII art. Perfect for code comments, social media, and more.
Caesar Cipher Encoder & Decoder
Easily encrypt and decrypt text using the Caesar cipher (shift cipher) with custom alphabets and shift values online.
Native to ASCII Converter
Convert between native system encodings (like GBK, Big5) and ASCII representations to resolve garbled text and transmission issues.
ASCII Code Lookup & Converter
Convert between characters and ASCII codes. Supports decimal, hexadecimal, and binary formats.
Text to ASCII Art Generator
Convert plain text into visual ASCII art. Perfect for code comments, social media, and more.
Caesar Cipher Encoder & Decoder
Easily encrypt and decrypt text using the Caesar cipher (shift cipher) with custom alphabets and shift values online.
Native to ASCII Converter
Convert between native system encodings (like GBK, Big5) and ASCII representations to resolve garbled text and transmission issues.
ASCII Code Lookup & Converter
Convert between characters and ASCII codes. Supports decimal, hexadecimal, and binary formats.
UUencode & UUdecode Tool
Convert binary data to uuencoded text and vice versa online. Supports full format parsing, ideal for processing legacy emails and files.
When debugging programs, analyzing network packets, or trying to understand the underlying representation of text in a computer, how do you quickly check the ASCII code of a character or convert a string of numbers back into readable text? This tool is designed to solve exactly that problem. Based on the ASCII (American Standard Code for Information Interchange) character set, it enables two-way conversion between text and its corresponding decimal values. ASCII is an encoding standard that maps characters to integers ranging from 0 to 127; for example, the ASCII code for the letter "A" is 65. The core function of this tool is to encode input text (outputting the ASCII decimal values of all its characters) and decode input decimal strings (restoring them to the original text characters).
Q: Can ASCII encoding process Chinese characters?
A: No. This tool strictly adheres to the standard ASCII character set (0-127), which only supports English letters, numbers, punctuation, and control characters. Non-ASCII characters like Chinese cannot be correctly encoded or decoded, and attempting to do so will result in gibberish or errors. If you need to process multilingual characters, please use a Unicode encoding tool such as UTF-8.
Q: When decoding, must the numbers be separated by spaces?
A: Yes. When decoding, you must separate each ASCII decimal value with a space (e.g., "72 101 108"). This is the required format for the tool to correctly identify and parse multiple independent values.
Please note that this tool only processes the standard ASCII character set (0-127). Entering non-ASCII characters (such as Chinese characters or emojis) will result in inaccurate encoding. When decoding, ensure you enter valid decimal integers separated by spaces; using other separators (like commas) or non-numeric characters will cause the decoding to fail. All processing is done locally in your browser and does not involve server transmission, though we still advise against processing highly sensitive or confidential information.
For developers, understanding ASCII encoding is fundamental for processing text data, network protocols (like HTTP headers), and hardware communication. A typical use case is debugging: when reading a string of raw byte data from a network or file, you can first convert it to decimal values and then decode it using this tool to quickly determine if it contains readable text. For example, when analyzing data, seeing the sequence "72 101 108 108 111" can quickly be recognized as the ASCII representation of "Hello". Please note that the decimal, hexadecimal (0x48), and binary (01001000) representations of ASCII codes are equivalent; this tool uses the most intuitive decimal format for input and output.
