ASCII Encoder/Decoder
Convert text to ASCII codes and back. View character codes and decimal values.
Key Features
⚡ Fast Processing
All operations run locally in your browser for instant results.
🔒 Privacy Protected
Your data never leaves your browser. No server storage.
How to Use ASCII Encoder/Decoder
Paste Your Input
Enter or paste your text or ASCII codes into the input area.
Choose an Action
Select "Encode" or "Decode" as needed.
Get Result
View the result in the output area and copy or download as needed.
Frequently Asked Questions
Basics
What is ASCII?
ASCII (American Standard Code for Information Interchange) is a character encoding system based on Latin letters that uses 7-bit binary numbers (0-127) to represent English letters, digits, punctuation marks, and control characters. For example, the ASCII code for uppercase letter A is 65, lowercase letter a is 97, and digit 0 is 48. ASCII is one of the most fundamental character encoding standards in computer systems and is essential knowledge for learning programming and computer science.
Why use ASCII encoding?
Using ASCII encoding has several main scenarios: viewing the underlying numeric representation of characters, debugging programs (such as viewing the actual values of strings in memory), data transmission and storage, and learning basic programming concepts. ASCII encoding allows both humans and machines to intuitively understand the correspondence between characters and numbers, commonly used in embedded development, network protocol analysis, serial communication, and other scenarios that require processing raw byte data.
Features
What format is the ASCII output?
By default, this tool outputs space-separated decimal ASCII codes, for example "Hello" encodes to "72 101 108 108 111". You can also select "Comma Separated" (72,101,108,108,111) or "Array Format" ([72, 101, 108, 108, 111]) from the options above. When decoding, this tool automatically recognizes common separators including spaces, commas, and newlines.
ASCII Reference Table
View Complete ASCII Table (0-127)
Encoding Comparison
View Character Mapping (First 20 characters)
Shows how each character is converted to its ASCII decimal value. Enter text above and click Encode to see the mapping.