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JSON Formatter

Encoding

Base64 Encoder / Decoder

Encode or decode Base64 payloads with UTF-8 support. Handy for JWTs, data URIs and binary transport in JSON.

Launching soon

The Base64 Encoder / Decoder is on the way

We are polishing this tool right now. In the meantime, use our fully-featured JSON Formatter — it already handles most workflows including validation, minification and tree view.

  • Runs 100% client-side
  • No sign-up, no usage limits
  • Free forever
  • Follows current specifications
Open the JSON Formatter

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

JSON Validator

Validate JSON syntax against RFC 8259 in real time. Precise line and column error reporting, 100% client-side.

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JSON Viewer

Interactive collapsible tree viewer for large JSON documents with search, copy-path, and syntax highlighting.

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JSON Minifier

Strip whitespace and shrink JSON payloads to the smallest possible size for APIs, storage, and network transfer.

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JSON Tree Viewer

Explore nested JSON as an interactive tree — expand, collapse, filter and copy JSON paths of any node.

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JSON Compare

Side-by-side comparison of two JSON documents with structural highlighting to spot differences instantly.

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JSON Diff

Structural diff of two JSON objects or arrays showing added, removed and modified keys with paths.

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