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Bearer Token Builder

Wrap a token in an Authorization: Bearer header -- with JWT auto-detection, whitespace validation, and curl/fetch/axios/HTTPie/Python export.

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What this tool does

Wraps an access token in a correctly formatted Authorization: Bearer <token> header — the standard way an API client proves it holds a valid token (RFC 6750) — and exports it ready to paste into curl, fetch(), axios, HTTPie, or Python requests, as a QR code, or as a downloadable text file. If the token looks like a JWT (three dot-separated Base64URL segments), it's automatically detected and its algorithm and expiry status are shown inline, with a direct link to the full JWT Decoder for a complete breakdown.

Why whitespace in the token matters

A Bearer token is a single HTTP header value — any stray whitespace, a trailing newline from copy-pasting, or a line break in the middle silently breaks the header (some HTTP clients reject it outright; others truncate or mangle it). This tool checks for exactly that and flags it before you paste a header that looks right but won't actually work.

Catching a Basic Auth token pasted here by mistake

A Basic Auth token and a Bearer token are both just strings, so it's an easy mix-up to paste one into the wrong tool. This one checks: if what you pasted isn't JWT-shaped and decodes cleanly as Base64 into a printable something:something pair, that's almost certainly a Basic Auth credential, not an opaque Bearer token — the tool flags it and links straight to the Basic Auth Generator instead of silently wrapping it in the wrong header.

Masking, QR export, history, and comparing two tokens

The token field can be masked (blurred, and automatically revealed while you're actively typing or editing it) for screen-sharing or a shoulder-surfing-prone room. The built header can be shown as a QR code for moving it to another device, and a session-only history keeps the last 8 built. A separate compare section checks whether two tokens are exactly identical — useful for confirming a refreshed token actually changed, or that two environments are issuing the same value.

Bearer vs. Basic

Unlike Basic Auth, a Bearer token carries no username/password pair to decode — it's an opaque (or, for a JWT, self-describing) credential the server already knows how to validate, typically issued by an OAuth 2.0 authorization server or a similar token issuer. Anyone holding the token can use it exactly like the legitimate client until it's revoked or expires, so it must be treated as a secret and only ever sent over HTTPS.

Privacy

Everything — formatting, JWT detection, QR rendering, and export — runs locally in your browser. The session history lives only in this tab's memory. The token you enter is never sent to a server.

FAQ

Frequently asked questions

Is my token uploaded anywhere?
No. Formatting, JWT detection, QR rendering, and every export format are generated entirely in your browser -- the token never leaves your device. The session history lives only in this tab's memory.
How does it know my token is a JWT?
A JWT is always three Base64URL segments separated by dots. When a pasted token matches that shape, this tool decodes its header locally to show the algorithm and, if present, the expiry status -- the same detection and decode logic as the full JWT Decoder & Generator tool.
Why does it warn about whitespace in my token?
An HTTP header value can't safely contain a line break, and stray leading/trailing whitespace is easy to introduce by accident when copy-pasting a token -- both silently produce a header that looks right but a server (or HTTP client) may reject or mangle. This tool flags either case before you copy a broken header.
Why does it suggest Basic Auth Generator sometimes?
If what you pasted isn't JWT-shaped but decodes cleanly as Base64 into a printable "something:something" pair, that's a strong sign it's actually a Basic Auth credential pasted into the wrong tool -- an opaque Bearer token has no reason to decode into that shape.
What does the mask button do?
It blurs the token field so it isn't readable at a glance -- useful when sharing your screen -- and automatically un-blurs while you're actively focused in the field editing it.
Can I compare two tokens to see if they're the same?
Yes -- the Compare Two Tokens section normalizes both (stripping an "Authorization: Bearer" prefix if present) and reports whether they're exactly identical, useful for confirming a refreshed token actually changed.
What export formats are available?
The raw header line, curl -H, a fetch() headers object, an axios config headers object, an HTTPie Authorization header argument, a Python requests headers dict, a QR code, and a downloadable text file with every format in it.
What's the difference between a Bearer token and Basic Auth?
Basic Auth encodes a username and password directly in the header (reversible, not encrypted). A Bearer token is an opaque or self-describing credential issued separately -- usually by an OAuth 2.0 server -- that the API already knows how to validate; it carries no embedded username/password to decode out of the header itself.
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