Encoding
Base64 Encoder / Decoder
Encode or decode Base64 payloads with UTF-8 support. Handy for JWTs, data URIs and binary transport in JSON.
Output will appear here…Why use our Base64 Encoder / Decoder?
100% private
Everything runs in your browser. Your data never leaves your device — safe for production payloads.
Instant results
No round trips, no rate limits, no login. Format, validate and inspect megabytes of JSON in milliseconds.
Standards-first
Follows RFC 8259 / ECMA-404 exactly. Reports errors with precise line and column diagnostics.
Related developer tools
Base64 to JSON
Decode a Base64-encoded JSON payload and pretty-print the result. Perfect for JWT payload inspection.
OpenURL Encoder / Decoder
Percent-encode or decode URLs and query strings. RFC 3986 compliant, UTF-8 safe, with component and full-URL modes.
OpenJSON to Base64
Convert JSON to a compact Base64-encoded string. Great for embedding JSON in URLs, cookies or headers.
OpenJWT Decoder
Decode JSON Web Tokens to inspect the header, payload and signature — verify claims and expiry in-browser.
OpenCSV Escape
Escape a value for safe inclusion in a CSV cell — quotes fields containing commas, quotes or newlines.
OpenCSV Unescape
Reverse CSV field quoting — strips surrounding quotes and unescapes doubled quotes.
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