What is Base64 Encoder/Decoder?
Base64 encoding turns binary data and plain text into a string made of letters, numbers, and a few symbols, safe to embed in JSON, XML, email attachments, or data URLs. You have probably seen it in JWT tokens, CSS data URIs, or API fields labeled "image_base64."
Decoding goes the other way: you paste a Base64 string and get the original text back. Handy when you are debugging an API response, inspecting a token payload, or trying to figure out what a garbled string actually contains.
This encoder handles UTF-8 text properly (including emoji and non-English characters), which basic btoa/atob sometimes mangle. Switch between Encode and Decode tabs, paste your input, and get the result instantly. Everything runs client-side, nothing is stored or transmitted.
How to Encode or Decode Base64
- Choose the Encode tab to convert plain text to Base64, or Decode to reverse the process.
- Paste or type your input into the text area.
- Click the action button, the result appears in the output panel immediately.
- Use Copy to grab the output for your code, API request, or debugging session.
Why Use Our Free Base64 Encoder/Decoder Tool?
- Runs entirely in your browser. Encoding and decoding happen client-side, so sensitive tokens, credentials, or payloads never travel to a server.
- Full UTF-8 support. Emoji, accented characters, and non-Latin scripts encode and decode correctly, without the corruption you get from raw btoa/atob.
- Fast and free, no limits. Convert text in either direction instantly, as many times as you like, with no signup and no usage caps.
- Helpful error handling. Invalid Base64 input is flagged clearly instead of failing silently, so you can spot missing padding or stray line breaks quickly.
Frequently Asked Questions
Answers to what people usually ask about base64 encoder/decoder.
Is Base64 encryption?+
No. Base64 is encoding, not encryption. Anyone can decode it in seconds. Never use Base64 alone to protect passwords or secrets, it is only meant for safe transport in text-based formats.
Why does decoding fail with an invalid character error?+
The input probably is not valid Base64. Check for missing padding (= signs at the end), line breaks in the middle of the string, or text that was never Base64-encoded in the first place.
Can I encode files?+
This tool works with text input. For small files you can paste text content directly. For binary files like images, use your browser devtools or a dedicated file-to-Base64 utility, we may add file upload in a future version.