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Data Encoding & Hex Inspector
Base64 Encoder & Decoder (URL-Safe)
Convert strings, tokens, and files to and from Base64. Features RFC 4648 URL-safe mode, data URI generator, and Hex byte inspector.
Plaintext Input
Base64 Output
Length: 0 chars
Size Change: 0%
Understanding Base64 Encoding & URL-Safe RFC 4648
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format by translating it into a radix-64 representation. In web security, Base64 is used extensively in HTTP Basic Authentication headers (Authorization: Basic <credentials>), JWT tokens (JSON Web Tokens), and embedding inline images using data:image/png;base64 schemes.
Frequently Asked Questions
Base64 processes data in 3-byte groups (24 bits). If the input data length is not evenly divisible by 3, one or two equal signs (
= or ==) are appended as padding characters to complete the 4-character output block.
Yes. Standard JavaScript
btoa and atob crash on multi-byte Unicode strings (e.g., emojis, Chinese, Arabic, Tamil). NexTools encodes strings through TextEncoder and TextDecoder, ensuring 100% full UTF-8 Unicode compatibility.