OAuth URL Builder
Build an OAuth 2.0 authorization URL from your client ID, redirect URI, scope and other parameters. Runs entirely in your browser.
How to use OAuth URL Builder: Open OAuth URL Builder — it runs entirely in your browser with no setup. Paste or type your input into the text area, or upload a file where supported. Set any options you need. The result appears in the output panel — there is no upload step and no waiting on a server. Everything runs inside your browser, so your data never leaves your device.
https://accounts.google.com/o/oauth2/v2/auth?client_id=your-client-id&redirect_uri=https%3A%2F%2Fexample.com%2Fcallback&response_type=code&scope=openid+email+profile&state=xyz123Build an OAuth 2.0 authorization URL from your client ID, redirect URI, scope and other parameters. Runs entirely in your browser. OAuth URL Builder is a free, browser-based tool in the Filevane developer tools collection — there is nothing to install, no account to create and no watermark on your results. It works on desktop, tablet and mobile, and because the work happens on your own device it stays fast even with large inputs.
How to use OAuth URL Builder
- Open OAuth URL Builder — it runs entirely in your browser with no setup.
- Paste or type your input into the text area, or upload a file where supported.
- Set any options you need. The result appears in the output panel — there is no upload step and no waiting on a server.
- Review the output instantly; large inputs are handled locally without lag.
- Copy the result to your clipboard or download it. Your data never leaves the page.
Why use OAuth URL Builder?
- 100% free with no limits, no sign-up and no watermarks.
- Private by design — your data are processed in your browser and never uploaded to a server.
- Fast and lightweight, with instant results even on a phone or a slow connection.
- Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
- Part of a full developer tools suite, so related oauth url builder tasks are one click away.
Is it private and secure?
Your privacy is built in. OAuth URL Builder runs completely on your device, so whatever you enter stays in your browser and is never transmitted, logged or stored on any server.
Network activity: none. Nothing is sent and nothing is fetched. This tool makes no network request at all once the page has loaded — which is why it keeps working if your connection drops.
You do not have to take that on trust — our privacy proof page publishes the Content-Security-Policy that enforces it, lists every third party it permits, and shows how to verify the whole claim yourself.
Learn more
Is It Safe to Paste Production Data Into Online Tools? — JWTs, API responses and env files get pasted into online formatters every day. Here's what actually happens to that data and how to check before you paste.
Frequently asked questions
What goes into an OAuth authorization URL?
At minimum response_type, client_id, redirect_uri, scope and state. The authorization code flow uses response_type=code; the implicit flow (response_type=token) is now discouraged because the token is exposed in the URL fragment.
What is the state parameter for?
Cross-site request forgery protection. You generate an unguessable value, send it, and verify it comes back unchanged — which proves the callback belongs to the flow you started rather than one an attacker initiated.
What is PKCE and do I need it?
Proof Key for Code Exchange binds the authorization request to the token request using a code_challenge and code_verifier. It was originally for mobile apps, but current OAuth 2.1 guidance recommends it for every client, including server-side ones.
Why does the provider reject my redirect_uri?
OAuth requires an exact match against a pre-registered URI — including scheme, port, path and trailing slash. http://localhost:3000/callback and http://localhost:3000/callback/ are two different values as far as the provider is concerned.
Related tools
See all free developer tools or browse the full tool catalogue.