Base64 Encoder / Decoder vs URL Encoder / Decoder

Encode any UTF-8 string to Base64 or decode a Base64 string back to plain text. Supports standard Base64 (RFC 4648) and URL-safe Base64 (uses - and _ instead of + and /). Detects and reports malformed input.

{
  "input": "Hello, World!",
  "mode": "encode",
  "charset": "standard"
}

Encode any string for safe use in a URL or query parameter using percent-encoding (RFC 3986), or decode a percent-encoded string back to plain text. Supports both full URL encoding (preserves ://?=& structure) and component encoding (encodes every special character). Shows a character-by-character encoding table for reference.

{
  "input": "hello world & more=stuff",
  "mode": "encode-component"
}