Base64 Encoder/Decoder

Base64 encoding converts binary data — images, fonts, files — into a plain ASCII string that can be safely embedded in HTML, CSS, JSON, or transmitted over text-based protocols without corruption. It is used to embed small images directly into HTML as Data URIs, encode file attachments in email APIs, pass binary data through JSON APIs that do not support raw binary, and store binary content in text-based databases.

How the Base64 Encoder/Decoder works

VIPToolkit's Base64 Encoder and Decoder handles both directions: paste a string to encode it to Base64, paste a Base64 string to decode it back to readable content, or upload a file (image, SVG, font, or any binary) to generate a Base64 Data URI instantly. Full UTF-8 support means it handles non-ASCII characters correctly. All processing uses the browser's native FileReader API — no server upload, no data exposure.

Decoding JWT tokens

JWT (JSON Web Token) payloads are Base64url-encoded. Paste the middle segment of any JWT (between the two dots) into the decoder to inspect the payload as readable JSON — useful for debugging authentication issues without sending tokens to a third-party service.

Common developer use cases

Generate Data URI strings for small icons to avoid extra HTTP requests, encode API payloads, decode Base64 JWT payloads for inspection, and test Base64 encoded email attachments. Need to inspect the decoded JSON payload of a token? Drop it into the JSON Formatter & Validator next.