Base64 Encoder / Decoder
Encode or decode Base64 text. Free, no signup required.
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How It Works
Choose Encode or Decode mode using the toggle
Paste your text or Base64 string into the input
Click Run — then copy the result or use Swap to reverse it
Why Use OneConvertly to Base64 Encoder / Decoder?
100% Private
Your files never leave your device. Everything is processed in your browser.
No Signup Required
Use this tool instantly — no account, no email, no limits.
Works on Any Device
Runs in Chrome, Firefox, Safari, and Edge on desktop and mobile.
Completely Free
No watermarks, no daily caps, no hidden fees.
Frequently Asked Questions
What is Base64?
Base64 is an encoding scheme that converts binary or text data into a string of ASCII characters. It is commonly used to embed data in URLs, HTML, or JSON payloads.
Does it support Unicode and emoji?
Yes. The encoder handles the full Unicode range including emoji, accented characters, and non-Latin scripts.
Is my data private?
Completely. All encoding and decoding happens locally in your browser. Nothing is sent to any server.
Is there a size limit for Base64 encoding?
There is no hard limit. Text up to several megabytes encodes instantly. Very large inputs may slow down depending on your device memory.
Can I encode files or images to Base64?
Currently this tool encodes text strings. For file-to-Base64 encoding, you would need to convert the file to text first or use a developer console.
Does it work on mobile devices?
Yes. The encoder and decoder work in any modern mobile browser — paste your text, tap Run, and copy the result.
What is the difference between Base64 and URL encoding?
Base64 converts any data into ASCII characters using a 64-character alphabet. URL encoding (percent-encoding) escapes only unsafe URL characters. Use our URL Encoder tool for URL strings.