Base64 Encoder & Decoder Online — Free, Private, Instant
Paste any text or Base64 string into the input box, then click Encode to convert it to Base64 or Decode to convert it back to plain text. Supports full UTF-8 including emoji and non-Latin scripts. All processing is done locally — nothing leaves your device.
How it works
- 1 Paste your text or Base64 string Click the input area and paste the text you want to encode, or paste a Base64 string you want to decode back to plain text.
- 2 Click Encode or Decode Hit Encode to convert your text to a Base64 representation, or Decode to convert a Base64 string back to readable text. Invalid Base64 will show an error.
- 3 Copy the result Click Copy to copy the result to your clipboard in one click. Use Swap to move the output back to the input for further operations.
Your data stays private
All processing happens entirely in your browser. No files, text, or data are ever sent to our servers. You can disconnect from the internet and this tool will still work.
Frequently asked questions
- What is Base64 encoding?
- Base64 is an encoding scheme that converts binary data or text into a string of ASCII characters using 64 printable characters (A–Z, a–z, 0–9, +, /). It's commonly used to embed binary data in JSON, XML, HTML, or email — anywhere a text-safe format is required.
- When would I use Base64 encoding?
- Common use cases include embedding images in CSS or HTML as data URIs, encoding binary data for JSON APIs, storing complex strings in cookies or headers, and basic data obfuscation (note: Base64 is not encryption).
- Is Base64 the same as encryption?
- No. Base64 is an encoding format, not an encryption algorithm. Anyone can decode a Base64 string with a single click. Do not use it to protect sensitive data — use proper encryption for that.
- Does it support Unicode and emoji?
- Yes. The encoder uses the TextEncoder API which handles full UTF-8, so it works correctly with emoji, CJK, Cyrillic, Arabic, and any other Unicode text.
- Is my data private?
- Yes. All encoding and decoding happens in your browser using the native btoa/atob JavaScript APIs. No data is sent to our servers.
- Is it free?
- Yes — no signup, no limits, no ads, free forever.