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Base64 Encoder Decoder

Free online Base64 Encoder and Decoder for 2026. Encode text to Base64 or decode Base64 strings instantly — URL-safe mode included, 100% browser-based.

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What Is Base64?

Base64 is an encoding scheme that represents binary data as printable ASCII text using 64 characters: A–Z, a–z, 0–9, and the symbols + and /. It was designed to safely carry binary data across systems that only handle text — such as email (MIME), HTTP headers, and JSON payloads.

Base64 is not encryption — anyone can decode it instantly. For actual security, use encryption algorithms like AES. For other encoding tools, see our Hex to Text Converter or ASCII to Text Converter.

?How It Works

  1. 1

    Select Encode or Decode using the tabs above.

  2. 2

    Type or paste your text or Base64 string into the input box.

  3. 3

    The result appears instantly — no button needed.

  4. 4

    Toggle URL-safe mode to replace + and / with - and _.

  5. 5

    Copy or download the output with one click.

Base64 Use Cases

  • MIME Email: Encodes binary attachments so they can be safely transmitted over email protocols.
  • Data URIs: Embed images directly in CSS/HTML as data:image/png;base64,…
  • JWT Tokens: JSON Web Tokens use URL-safe Base64 to encode their header and payload sections.
  • HTTP Auth: Basic Authentication encodes credentials as Base64 in the Authorization header.

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Frequently Asked Questions

What is Base64 encoding?
Base64 encoding converts binary data into a text string using 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). It is used to safely transmit binary data over text-based systems like email and HTTP.
Is Base64 the same as encryption?
No. Base64 is encoding, not encryption. It provides zero security — anyone can decode it instantly. For actual security, use proper encryption like AES.
What is URL-safe Base64?
URL-safe Base64 replaces + with - and / with _ so the string can be used in URLs and filenames without percent-encoding. Enable it with the checkbox above the output.
Why does Base64 output end with == ?
Base64 processes data in groups of 3 bytes. If the input length isn't a multiple of 3, = padding is added. One = means 1 padding byte; == means 2 bytes of padding.
What is Base64 used for?
MIME email attachments, data URIs for embedded images, JSON Web Tokens (JWT), and HTTP Basic Authentication headers all use Base64 encoding.
How do I decode Base64?
Switch to the Decode tab and paste your Base64 string. The original text appears instantly. Works with both standard and URL-safe Base64.
Is my data safe?
Yes. All encoding and decoding runs entirely in your browser. Nothing is sent to any server or stored anywhere.