Base64 Encoder & Decoder – Free Online Base64 Encode/Decode Tool

Encode any text to Base64 or decode a Base64 string back to plain text — instantly in your browser. Fully supports UTF-8 characters (including accents, emojis, and non-Latin scripts). Offers standard Base64 and URL-safe Base64 (RFC 4648 §5) variants. Perfect for developers working with HTTP headers, data URIs, JSON Web Tokens, email encoding, and API integrations. No login or installation required.

Mode

Variant

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How to Use the Base64 Encoder & Decoder

What is Base64?

Base64 is an encoding scheme that converts binary data (or text) into a sequence of 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). It is widely used to safely transmit data in contexts that only support text — such as email attachments, data URIs, HTTP Authorization headers, and JSON payloads.

Modes:

  • Text → Base64 (Encode): Converts any plain text (including Unicode / UTF-8) into a Base64 string. Example: Hello → SGVsbG8=
  • Base64 → Text (Decode): Decodes a Base64 string back into its original text. Paste any Base64 value and get the original content instantly.

URL-safe mode (RFC 4648 §5):

When enabled, the standard characters + and / are replaced with - and _ respectively, and padding (=) is removed. Use this format when embedding Base64 in URLs, query parameters, or filenames where + and / would be misinterpreted.

How to use:

  1. Select Text → Base64 to encode, or Base64 → Text to decode.
  2. Optionally enable URL-safe mode if you need a URL-compatible output.
  3. Paste or type your input — the result appears instantly.
  4. Click Copy to copy the output to your clipboard.