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Base64, URL & Hexadecimal Transformer

Multi-format client-side encoder/decoder with UTF-8 unicode support, Base64URL web-safe conversion, and local file DataURI parsing.

Source Payload (Input) 0 chars / 0 bytes
Base64 Encoded Output 0 chars
Ratio: 0.0% Padding (Standard B64): None UTF-8 Multi-byte: No
📁 Drag & Drop File to Convert to Base64 DataURI (Images, PDFs, Keys - Executed 100% locally in memory)

Understanding Base64 Encoding and RFC 4648 Standards

Base64 is a binary-to-text encoding scheme that converts arbitrary 8-bit binary data into a set of 64 printable ASCII characters (A-Z, a-z, 0-9, +, and /). It is widely used in MIME email attachments, embedded DataURI media assets, and Authorization HTTP headers.

Standard Base64 vs. Base64URL Web-Safe Variant

Standard Base64 utilizes the plus (+) and slash (/) characters, which hold special meanings in URL parameters and filename paths. The Base64URL specification (RFC 4648 Section 5) addresses this by replacing:

Solving Native JS UTF-8 Multi-Byte Character Exceptions

JavaScript's native window.btoa() and window.atob() functions operate strictly on Latin-1 (Byte) character sets, throwing an InvalidCharacterError exception when processing multi-byte UTF-8 symbols (such as CJK characters or emojis). This tool utilizes native TextEncoder and TextDecoder API pipelines to handle full 32-bit Unicode mapping without data corruption.