Free Base64 Encoder, URL Encoder & JWT Decoder — Developer Tools Online
Base64 Encoding Made Easy
FreeDevKit's Base64 tool encodes and decodes text in real-time as you type. That makes it useful when you are translating values for APIs, config snippets, or examples that need a standard text-safe representation. Unicode support keeps the workflow practical for real-world strings instead of just simple test input.
URL Encoding for APIs
The URL Encoder uses encodeURIComponent and decodeURIComponent to handle special characters in query strings, form data, and API parameters. That is important because many broken API requests fail for one simple reason: the value was never encoded correctly in the first place.
JWT Decoder with Expiry Info
Paste any JWT token to instantly see the decoded header and payload as formatted JSON. The expiry claim becomes visible right away, which helps you tell whether a token is still useful or already stale. That is a fast sanity check for auth debugging, frontend state, and handoff work between services.
Use It as a Small Debugging Loop
A useful habit is to copy the encoded string, decode it, inspect the output, and then go back to the original source only if you need to regenerate it. That avoids wasted time jumping between tools or guessing whether the problem is in the value, the transport, or the token itself.
Where These Tools Save the Most Time
These helpers are strongest in API testing, query-string debugging, token inspection, and quick browser-side transformations where you want a clean answer fast.
Frequently Asked Questions
Decode your Base64 or JWT data
Open Base64, URL Encode, and JWT Decoder to inspect encoded values and move faster on API and auth workflows.
Open Base64 Tools