Free · in your browser
Base64 Converter
Encode text to Base64 and decode it back instantly — UTF-8 safe, so emojis and accents survive the round trip. Free, fast and private: your text never leaves your device.
Private by design — your text is processed locally and never uploaded.
How to encode and decode Base64 online
- Type or paste your text into the Input box on the left.
- Click Encode → to convert text to Base64, or Decode ← to turn Base64 back into readable text.
- Use Copy output to grab the result, or Clear to start over.
Why use a Base64 converter?
Base64 lets you carry binary or special-character data safely through channels that only expect plain text — think JSON payloads, data URIs in CSS, email attachments, basic-auth headers, and JWT segments. Hand-encoding it is error-prone, especially with Unicode, where naïve tools mangle emojis and accents. This converter uses a UTF-8 safe round trip so every character comes back exactly as you sent it, and it runs entirely in your browser, so even sensitive tokens or credentials stay on your machine.
Frequently asked questions
Is this Base64 tool free and private?
Yes — it is 100% free with no sign-up, and completely private. Your text is encoded and decoded directly in your browser using built-in functions; nothing is ever uploaded to a server.
Does it handle emojis and non-English characters?
Yes. The encoder is UTF-8 safe, so accented letters, emojis, and any Unicode text convert to Base64 and back without corruption.
Why am I getting a decode error?
Decoding only works on valid Base64. If you paste plain text, truncated, or malformed data, you will see a clear error message — check that the input contains only valid Base64 characters and correct padding.
What is Base64 used for?
Base64 encodes binary or text data into an ASCII string so it can travel safely through systems built for text — like email, JSON, data URIs, and HTTP headers.