Base64 Encoder & Decoder Online Free — Instant Encoding
Encode text to Base64 or decode Base64 back to plain text.
What is Base64 Encoder / Decoder?
Encode any plain text to Base64 format or decode Base64 strings back to readable text. Supports UTF-8 characters including emoji and international text. All processing happens in your browser.
Common Use Cases
Encoding credentials for HTTP Basic Auth headers, embedding binary data in JSON/XML, encoding email attachments, data URI generation, and debugging API responses.
How It Works
Uses the browser's built-in btoa() and atob() functions with UTF-8 encoding support via TextEncoder/TextDecoder for full Unicode compatibility.
Frequently Asked Questions
Is Base64 encryption?
No. Base64 is encoding, not encryption. It is reversible without a key and provides no security.
Does it support Unicode and emoji?
Yes. Full UTF-8 encoding is supported, including emoji and CJK characters.
What is Base64 used for?
Transmitting binary data over text-based protocols, embedding images in CSS as data URIs, and HTTP Basic Authentication headers.
How do I use Base64 for HTTP auth?
Encode your username:password in Base64, then add Authorization: Basic [encoded string] header to HTTP requests.
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