Otaku Dojo Tools
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Base64 Encode & Decode

The Base64 tool encodes any text — including Chinese, Japanese and emoji — as UTF-8 Base64, or decodes Base64 back into the original text. It supports standard Base64 and URL-safe Base64URL (which uses - and _ instead of + and /), and you can paste a data: URI directly to decode it.

  • Free
  • No sign-up
  • Runs in your browser
Mode
Format
Input
Result
Results appear as you typeShortcut: Ctrl + Enter to run

How to use the Base64 Encode & Decode

  1. Choose "Encode" or "Decode" and the standard or URL-safe format.
  2. Paste text or a Base64 string on the left.
  3. The result appears instantly; press "Copy" or "Download".

Examples

Encode text to Base64

Input
Hello, World!
Output
SGVsbG8sIFdvcmxkIQ==

Encode non-English text (UTF-8)

Input
御宅道場
Output
5b6h5a6F6YGT5aC0

Is Base64 encryption?

No. Base64 is an encoding that represents arbitrary bytes with 64 printable characters (A–Z, a–z, 0–9, +, /), so binary data can travel through text-only channels such as email, JSON, URLs and HTML. Anyone can decode it, so it does not protect passwords or secrets.

Encoded output is about 4/3 the size of the input; trailing = characters are padding.

Specs & key facts

StandardRFC 4648 (Base64 and Base64URL)
Text encodingUTF-8 — any language and emoji
FormatsStandard Base64, URL-safe Base64URL (no padding)
Tolerant decodingIgnores spaces and line breaks; accepts data: URIs
ProcessingIn your browser (nothing is uploaded)
PriceFree, no sign-up

FAQ

Why does another tool give a different result for non-English text?

The text encoding differs. This tool uses UTF-8, the standard for the web and APIs; tools using UTF-16 or legacy encodings produce different output.

When should I use URL-safe Base64?

When the value goes into a URL, filename or JWT. Standard Base64 uses + and /, which have special meaning in URLs; URL-safe Base64 uses - and _ and drops the trailing =.

Why does decoding say "not valid UTF-8 text"?

The Base64 contains binary data such as an image or archive, not text, so it cannot be displayed as text.