Base64 Encoder/Decoder
Encode and decode Base64 strings
This free online base64 encoder/decoder runs in your browser and is part of our Converters collection.
Base64 Encoder/Decoder
Encode and decode Base64 strings
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Instant In-Browser Execution
Runs locally in JavaScript without wait times or server delays.
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100% Privacy & Security
Your inputs and files are never stored or logged on remote servers.
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Cross-Device Responsive
Fully optimized for mobile smartphones, tablets, and desktop displays.
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100% Free Forever
No subscription fees, no signups, and no software installations.
How to Use the Online Base64 Encoder/Decoder
1
Select Operation (Encode or Decode)
Choose "Encode" to convert plain text into Base64 format, or "Decode" to restore Base64 back to plain text.
2
Input Text or Payload
Type, paste, or drag a text file into the input editor.
3
Toggle URL-Safe Mode (RFC 4648 §5)
Check "URL-Safe" to replace `+` and `/` characters with `-` and `_` and omit padding for query string safety.
4
Copy or Download Converted Output
Inspect the live encoded or decoded output and click "Copy" or download as a text file.
Frequently Asked Questions
Common questions about using this free online base64 encoder/decoder.
What is Base64 encoding used for? ▾
Base64 represents binary data in an ASCII string format using 64 printable characters (`A-Z`, `a-z`, `0-9`, `+`, `/`). It prevents data corruption when transmitting binary content over text-only protocols like HTTP, email (MIME), and JSON.
Does this tool support international UTF-8 characters and emojis? ▾
Yes. Traditional JavaScript `btoa()` crashes on non-Latin1 characters. Our tool uses full UTF-8 TextEncoder and TextDecoder byte streams, supporting multilingual text and emojis without errors.
What is the purpose of the padding `=` characters at the end of Base64? ▾
Base64 processes data in 3-byte blocks (24 bits) to produce 4 characters (6 bits each). If the input byte length is not divisible by 3, one or two `=` padding characters are added to complete the final 4-character block.
Is Base64 a form of encryption? ▾
No! Base64 is an encoding format, not encryption. Anyone can decode a Base64 string instantly without a key. Never use Base64 alone to protect confidential passwords or secrets.
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