JWT Decoder
Decode JWT tokens to inspect header and payload claims.
Developer
Convert text to Base64 or decode Base64 back to text. Encoding uses UTF-8, and decoding accepts standard or URL-safe Base64. Results update live and stay in your browser.
Results update as you type. Nothing is stored or sent to a server.
Use the Base64 Encoder & Decoder form near the top of this page. Enter the values you know, run the tool, and review the results panel. You can change inputs and run it again. Processing stays in your browser and is not uploaded to Utilnivo servers.
Example: open Base64 Encoder & Decoder, enter a realistic set of inputs for your situation, and note the primary result. Change one input—such as an amount, rate, or option—and compare how the output changes so you can choose a scenario that fits your needs.
Choose Encode or Decode, then paste or type text. Encoding converts UTF-8 text to standard Base64. Decoding accepts standard or URL-safe Base64 (with optional whitespace) and returns the original text. All processing runs in your browser.
This tool runs in your browser for convenience. Results are estimates or transformations based on the inputs you provide and may not cover every edge case.
Yes. Text is encoded as UTF-8 before Base64 conversion, so characters like accents and emoji are supported.
Yes. Decoding accepts standard Base64 and URL-safe variants that use - and _ instead of + and /. Whitespace is ignored.
No. Encoding and decoding run locally in your browser and text is not stored.