Base64 Encode / Decode
Encode or decode Base64 strings - fully client-side
Base64 Converter
What this tool does
Encodes text to Base64 or decodes Base64 back to text - fully in your browser. Supports URL-safe Base64 variant for tokens and query strings.
Who it's for: Developers embedding binary data in JSON or URLs, engineers working with JWTs, and anyone pasting mystery Base64 strings from logs.
When to use
- •Encode a small image or binary as a data URI.
- •Decode a base64-encoded email body or HTTP header value.
- •Embed credentials into a Basic Auth header.
- •Inspect the contents of a Data URI.
How it works
- 1Paste text in the input area.
- 2Toggle encode/decode.
- 3Result updates live as you type.
- 4All computation is local - no data leaves your browser.
Tips
- •Base64 is encoding, NOT encryption - never use it to hide secrets.
- •Base64 adds ~33% size overhead - avoid for large payloads.
- •Use URL-safe variant (- and _) inside query strings and JWTs.