Base64 & URL Encoding Explained for Developers

Base64 encodes binary data as ASCII text — common in JWT tokens, data URLs, and email attachments. URL encoding (percent-encoding) escapes special characters in query parameters.

Common mistakes

Double-encoding URLs breaks links. Confusing Base64 with encryption is a security risk — Base64 is encoding, not encryption. Always decode on the same charset (UTF-8) you used when encoding.

Try it on NxtTls

Use our Base64 and URL encoder pages for instant encode/decode with copy support. All processing is client-side.