Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 back to text instantly — paste your input, choose a mode, and see the result update live.
- Input Characters
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- Output Characters
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CleanTextly's Base64 Encoder & Decoder converts text to Base64 and decodes Base64 back to text, entirely in your browser. It's a fast, free online Base64 converter — paste a string, switch between encode and decode, and the result updates instantly, with correct support for Unicode text like emoji and non-Latin scripts. Base64 encoding is not encryption: it makes text safe to store or transmit in text-only formats, but it doesn't hide or protect its contents, since anyone can decode Base64 back to the original text just as easily.
Features
Encode Text to Base64
Converts any text into Base64 for use in data URLs, config files, or systems that only accept plain text, e.g. "Hello World" becomes "SGVsbG8gV29ybGQ=".
Decode Base64 to Text
Converts a Base64 string back to its original, readable text — the standard way to decode base64 online.
Unicode & Emoji Safe
Encodes and decodes through the correct UTF-8 byte sequence rather than raw UTF-16 code units, so emoji, accented letters, and non-Latin scripts like Chinese, Korean, and Cyrillic round-trip correctly instead of breaking.
Clear Error Messages
If the input isn't valid Base64, or decodes to bytes that aren't valid text, the tool shows a clear error instead of crashing or silently producing garbled output.
Whitespace-Tolerant Decoding
Ignores line breaks and spaces in pasted Base64 input, since Base64 is often wrapped across multiple lines by email clients and other tools.
How to Use
- 1
Paste your text or Base64 string
Add the text you want to encode, or the Base64 string you want to decode, into the Input box.
- 2
Choose Encode or Decode
Select Encode to convert text to Base64, or Decode to convert a Base64 string back to text.
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Review the live output
The result updates instantly as you type — there's no button to click or page to reload.
- 4
Copy, swap, or download
Copy the result to your clipboard, use Swap to reverse the operation, or download it as a .txt file.
Example
Encoding Text to Base64
Input
Hello World
Output
SGVsbG8gV29ybGQ=
Common Use Cases
Embedding Data in URLs or CSS
Encode small text or binary-safe strings for use in data URLs, config files, or environment variables that only accept plain text.
Debugging APIs & Tokens
Decode a Base64-encoded API payload, JWT segment, or Basic Auth header to see exactly what data it contains.
Working with Config & Log Files
Decode Base64 values found in configuration files, environment variables, or log output back into readable text.
Learning How Base64 Works
Encode and decode simple examples to see exactly how text maps to Base64 characters and back.
Frequently Asked Questions
Base64 is a way of representing binary or text data using only 64 printable ASCII characters (A–Z, a–z, 0–9, +, /), so it can be safely stored or transmitted in systems that only support plain text.
No. Base64 is an encoding scheme, not encryption — it doesn't use a key, and anyone can decode a Base64 string back to its original text with a tool like this one. Don't use Base64 to protect passwords, secrets, or sensitive data; use real encryption for that.
Paste the Base64 string into the Input box and select Decode — the original text appears instantly in the Output box.
Paste your text into the Input box and select Encode — the Base64-encoded result appears instantly, ready to copy or download.
Decoding fails if the input contains characters outside the Base64 alphabet (A–Z, a–z, 0–9, +, /, =), has invalid padding, or decodes to bytes that don't form valid UTF-8 text — that means the input isn't a valid Base64-encoded string.
Yes. Encoding and decoding both go through the correct UTF-8 byte representation, so emoji, accented letters, and non-Latin scripts encode and decode correctly instead of breaking.
No. All encoding and decoding happens entirely in your browser using JavaScript — nothing is sent to a server or stored.