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Base64 to JavaScript Converter

Decode Base64 to UTF-8 text and emit safe JavaScript string literals or Uint8Array snippets in the browser.

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What is Base64 to JavaScript Converter?

This tool decodes a Base64 payload (raw string or data:…;base64,… URL) into bytes, then turns the result into formats you can paste into JavaScript: plain UTF-8 text, a JSON.stringify expression, a template literal, or a Uint8Array literal for binary blobs.

UTF-8 and binary

Web atob returns a binary string; this tool maps those bytes through TextDecoder for UTF-8 when you pick a text output. If the payload is not valid UTF-8 (for example gzip or random binary), switch to Uint8Array literal to avoid decode errors.

How to use

  1. Choose an Output format that matches how you will embed the value.
  2. Paste Base64 (whitespace is ignored automatically).
  3. Copy the generated snippet from the output panel.

Frequently Asked Questions

When should I use JSON.stringify output?

Use it when you need a double-quoted JavaScript string literal with correct escaping for quotes, newlines, and Unicode. It is the safest default for embedding decoded text inside source code.

Does URL-safe Base64 work?

Yes. - and _ are normalized to standard Base64 alphabet before decoding, and missing padding is added when possible.

Why does decoding fail?

Common causes are truncated paste, stray characters outside Base64, or wrong URL fragment. Ensure you copied only the Base64 portion (after the comma for data URLs).

Is decoding done on your servers?

No. Decoding runs locally in the browser tab; your Base64 never leaves your machine through this tool.

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