Encode and decode text, files, and URLs to and from Base64 instantly. Runs 100% locally in your browser with zero data leaving your computer.
Data encoding utility
Base64 is essential across web architecture for embedding inline assets like small SVGs and fonts directly into CSS or HTML (via data URIs), reducing HTTP round trips for critical above-the-fold assets.
It is also the industry standard for encoding binary tokens, authentication headers (Basic auth), cryptographic signatures, and webhook payloads across APIs.
Unlike many online converters that upload your credentials, tokens, or private keys to a remote server, SpeedVitals executes all Base64 operations locally in your browser using standard Web Cryptography and TextEncoder APIs.
Supports both RFC 4648 standard Base64 and URL-safe Base64 (substituting `+` and `/` with `-` and `_`) for query strings and JWT compatibility.
Base64 is a binary-to-text encoding scheme that translates binary data or non-ASCII text into a sequence of 64 printable ASCII characters (A-Z, a-z, 0-9, +, /). It is widely used in email (MIME), data URLs, JWT tokens, and HTTP headers.
No. All Base64 encoding and decoding executes 100% client-side in your web browser using JavaScript TextEncoder and TextDecoder APIs. Your text and files never leave your computer.
Standard Base64 uses "+" and "/" characters with optional "=" padding. URL-safe Base64 (RFC 4648 §5) replaces "+" with "-" and "/" with "_" to prevent character conflicts in URLs and query parameters, commonly omitting "=" padding.
Base64 uses 4 ASCII characters (6 bits each, totaling 24 bits) to represent every 3 bytes (24 bits) of raw data. This introduces an overhead of approximately 33% in file or string size.
No. Base64 is strictly an encoding format for safe data transport, not an encryption algorithm. Anyone can instantly decode Base64 data back into its original form.
