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Encoding & URLs

Base64 Decode

Paste any Base64 string and instantly recover the original text, even with emoji and non-English characters. Clear validation catches bad input.

100% Client-Side — Your Data Never Leaves Your Browser

What is Base64 Decode – Decode Base64 Online?

Decode Base64 strings back to plain text. Paste any Base64 string and instantly recover the original text, even with emoji and non-English characters. Clear validation catches bad input. The tool runs 100% in your browser — nothing is uploaded to a server, so your data stays private, and it is free to use with no signup required.

Quick Answers

Why do I get an invalid Base64 error?
Base64 uses only A-Z, a-z, 0-9, +, / and = padding. Newlines are ignored, but stray characters, wrong length or bad padding cause an error.
Does it decode data URIs?
Paste only the Base64 portion (after the comma) of a data URI. The tool decodes it back to its original text or binary content.
Is decoding safe for sensitive data?
Yes, everything happens locally in your browser. Nothing is transmitted or stored.
New to these formats? Read the Base64 explained developer guide — How Base64 works, why the 33% size cost exists, and the mistakes that break decoding.
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How do I use Base64 Decode – Decode Base64 Online?

  1. Paste the Base64 string into the input box.
  2. The decoded text appears instantly.
  3. Copy the result or download it as a file.

Why use our base64 decode – decode base64 online?

Decoding tokens, data URIs and payloads is a daily task for developers. This decoder accepts standard Base64, validates the character set and padding, and reports a clear error if your input is malformed. Full Unicode support means decoded UTF-8 text (including Hebrew, Arabic and emoji) comes back exactly as intended. All decoding runs locally in your browser.

Reading the data hidden inside a Base64 string

JWT payloads, webhook bodies and API tokens frequently arrive Base64-encoded. Decoding them is the fastest way to see the actual content — which is exactly what this tool does.

Base64 input

ewogICJ1c2VyX2lkIjogMTIzNDUsCiAgInJvbGUiOiAiYWRtaW4iLAogICJsb2dpbiI6ICJqLmRvZUBleGFtcGxlLmNvbSIKfQ==

Decoded output

{
  "user_id": 12345,
  "role": "admin",
  "login": "j.doe@example.com"
}

Paste a Base64 blob from an API response, a JWT middle segment, or a database dump and instantly read the real payload without writing a script.

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