Base64 Encoder & Decoder
Convert raw text blocks or local files into Base64 format and decode them back to their original state.
100% Client-Side (No data leaves your device)
Source Content
Result Output
Developer Guide: Working with Base64 Encodings
What is Base64 Encoding?
Base64 is a binary-to-text translation mechanism that represents binary payloads as readable ASCII characters. It bundles 24 bits of data into 4 six-bit chunks, ensuring that images, SSL certificates, and serialized blobs can travel across JSON APIs and HTTP headers without encoding corruption.
Common Backend Use Cases
- Data URIs: Inlining small SVG or PNG icons directly into CSS stylesheets or HTML images.
- API Authorization Headers: Constructing HTTP Basic Auth credentials (
Basic base64(user:password)). - Webhook Payloads: Safely transporting encrypted binary signatures and HMAC tokens.
URL-Safe Base64 (RFC 4648)
Standard Base64 contains + and /, which have reserved semantics in URL paths and query parameters. URL-safe Base64 swaps + for - (hyphen) and / for _ (underscore), stripping padding = to create URL-compliant tokens (such as in JSON Web Tokens / JWTs).