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How to Decode Base64 (Step by Step)

Decode a Base64 string back to text or binary in your browser — step by step, with a free Base64 decoder.

Base64 turns binary into text; decoding reverses it. Here is how to decode a Base64 string safely in your browser, with nothing uploaded.

  1. 1

    Open the decoder

    Open the Base64 tool and switch it to decode mode.

  2. 2

    Paste your Base64

    Paste the Base64 string into the input. It is processed locally — nothing is sent to a server.

  3. 3

    Read the result

    The decoded text appears instantly. If the input was binary (e.g. an image), decode to a file instead.

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Base64 Encoder & Decoder

Encode and decode Base64 text or files. Supports standard and URL-safe variants. Free, no signup.

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URL Encoder & Decoder

Encode and decode URLs and query string parameters. Percent-encoding for safe transmission.

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UTF-8 Converter

Convert text to UTF-8 hex bytes, decimal bytes, \xAB or \u{HEX} escape sequences — and back.

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Frequently asked questions

Why does my Base64 fail to decode?

Usually invalid characters or wrong padding. Base64 only uses A-Z, a-z, 0-9, + / and = padding; strip whitespace and check for a URL-safe variant (- and _).