Encode or decode text as Base64 or URL-encoded form — everything runs in your browser, nothing is sent anywhere.
Encode text to Base64 or decode Base64 back to text, and URL-encode or decode strings for query parameters — instantly, with correct handling of Unicode (UTF-8) so umlauts, emoji and non-Latin scripts round-trip without corruption.
Handy for inspecting data URIs, auth headers, webhook payloads and odd-looking query strings. Everything happens in your browser; nothing is sent to a server.
Yes. Text is encoded as UTF-8 before Base64, which is what browsers, Node and most APIs expect. Plain btoa() would fail on non-Latin characters.
encodeURIComponent escapes everything that has meaning in a URL (including / ? & =) and is what you want for a single query-parameter value. The tool uses that behaviour for URL encoding.
No. Base64 is an encoding, fully reversible by anyone. Never use it to hide secrets.
Base64 Decode & Encode · URL Decode & Encode
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