支持多种编码格式，一键转换
Encoding is the process of converting information from one form to another, while decoding is the process of restoring encoded information back to its original form. Encoding and decoding are among the most fundamental and important concepts in computer science, widely used in data storage, network transmission, and security encryption.
Base64 is a method for representing arbitrary binary data using 64 printable characters (A-Z, a-z, 0-9, +, /). It splits every 3 bytes (24 bits) into 4 groups of 6 bits, each mapped to a Base64 character. When the original data length is not a multiple of 3, = is used for padding.
Base64URL is a variant of Base64 that replaces + with -, / with _, and removes trailing = padding, making it directly usable in URL paths and filenames without additional escaping.
Base32 uses 32 characters (A-Z and 2-7) to represent binary data, mapping every 5 bits into one character. Compared to Base64, Base32 produces larger output (about 60% increase) but offers these advantages:
Hexadecimal encoding represents each byte as two hex characters (0-9 and A-F), providing the most intuitive readable representation of binary data. Encoded size doubles (100% increase).
Binary encoding converts each byte into an 8-bit binary string (0s and 1s). This is the lowest-level representation in computing, useful for understanding the bit-level structure of data.
URL encoding (also called percent-encoding) converts special characters in URLs (such as spaces, non-ASCII characters, &, ?, etc.) into %XX format, where XX is the character's hexadecimal ASCII code. This is fundamental to the HTTP protocol, ensuring URLs can be safely transmitted over the network.
Unicode encoding converts non-ASCII characters into \uXXXX escape sequences, commonly used in JSON, JavaScript strings, and Java source code to represent international characters.
ASCII encoding converts each character into its corresponding decimal numeric code (0-127). This is the earliest character encoding standard and laid the foundation for modern text encoding.
HTML entity encoding converts special HTML characters (such as <, >, &, ") into their corresponding entity names or entity numbers (e.g., < or <), preventing XSS attacks and HTML parsing errors.
Morse code uses combinations of dots (.) and dashes (-) to represent letters, numbers, and punctuation. It is one of the earliest encoding methods in the history of telecommunications. Although no longer used in modern communications, it remains an important legacy in cryptography and communication history.
Many people confuse encoding with encryption, but they are fundamentally different:
| Property | Encoding | Encryption |
|---|---|---|
| Purpose | Data format conversion for transmission/storage | Data confidentiality, preventing unauthorized access |
| Requires Key | No | Yes |
| Reversibility | Fully reversible (public algorithm) | Requires correct key to decrypt |
| Security | No security, format conversion only | Provides confidentiality |
| Typical Examples | Base64, Hex, URL Encode | AES, RSA, ChaCha20 |
In daily development, developers often need to quickly verify encoding results, debug data transmission issues, or perform simple encoding conversions without writing code. Our online codec tool offers one-click conversion for 10 common encoding formats, supports real-time bidirectional switching, and requires no software installation — just open your browser. It is an essential tool in every developer's toolkit.