Base64/URL Encoder & Decoder
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Encode text to Base64 or URL format, or decode an encoded value back to its original text.
How to use
Choose Base64 or URL.
Choose Encode or Decode.
Paste your text or encoded value into the input box — the result updates instantly.
Use the swap button to move the result back into the input and convert in the other direction.
Working with JSON text? Try the JSON Formatter too.
자주 묻는 질문
Q1. Is my input text sent to a server?
No. All encoding and decoding happen entirely in your browser and are never sent to or stored on a server.
Q2. When should I use Base64 encoding?
It's used when binary data like images or files needs to be represented as text, for example in API responses, email attachments, or data URIs. It's a representation change, not encryption, so it isn't meant for security purposes.
Q3. When do I need URL encoding?
When a URL's query parameters contain non-ASCII characters, spaces, or special characters, they need to be converted to a form like %20 so browsers and servers interpret them correctly.
Q4. Why does decoding fail?
This happens when the input isn't a valid Base64 string, or when a % in URL-encoded input isn't followed by valid hex digits. Double-check the original value.
Q5. Can non-ASCII text be Base64 encoded?
Yes. Text is first encoded as UTF-8 and then converted to Base64, so any Unicode character — including non-Latin scripts and emoji — is supported.
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