Tokens, Keys & Encoding100% In-BrowserRFC 4648
Base64 Encoder / Decoder
Encode plaintext to Base64/Base64URL and decode Base64 data back to readable UTF-8 strings.
Real-time processing·No server uploads·Zero telemetry
base64-encoder-/-decoder
LIVE
Input (Plain)
31 characters
Output (BASE64 encoded)
SGVsbG8gV29ybGQhIFNlY3VyZSBlbmNvZGluZyDwn5SQ
44 characters
Base64
Encodes binary data using A-Z, a-z, 0-9, +, / (RFC 4648)
✓ Email attachments, data URIs, JWTs
URL Encoding
Percent-encodes special characters so URLs remain valid (RFC 3986)
✓ Query strings, form submissions
HTML Entities
Converts special chars to &entity; notation to prevent XSS
✓ Web content, preventing script injection
How to Use Base64 Encoder / Decoder
01
Type or paste text into input box.
02
Toggle between Encode and Decode modes.
03
Copy the converted string.
Privacy Guarantee
Base64 Encoder / Decoder runs 100% client-side in your web browser. Your data, passwords, keys, and files are processed using the Web Crypto API and never transmitted to any server. Zero telemetry, zero storage, zero cloud processing.
Frequently Asked Questions
What is the difference between Base64 and URL-Safe Base64?
URL-Safe Base64 replaces '+' with '-' and '/' with '_', avoiding URL encoding conflicts.
Discover More