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About this tool
Flag wildcard, credential, and unsafe-origin combinations.
CORS Configuration Linter is a free security & privacy tool that runs entirely in your browser — nothing to install, no account to create, and your data never leaves your device. Open the page, add your input, and get a clean, copy-ready result in seconds.
Open CORS Configuration Linter on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Enter what you know and see an accurate result immediately — no formulas or spreadsheets required.
Adjust the inputs to see exactly how each change affects the outcome before you decide.
Take a clear, precise number into your plans, reports, or conversations.
Yes — CORS Configuration Linter is completely free on AltFTool, with no signup, no trial limits, and no hidden costs.
Yes. CORS Configuration Linter runs in your browser, so what you enter or upload stays on your device instead of being sent to a server.
Flag wildcard, credential, and unsafe-origin combinations. It's built for quick, everyday security & privacy tasks with results you can copy or download straight away.
Yes — CORS Configuration Linter works in any modern browser, on desktop, tablet, and mobile, with the same features everywhere.