CORS Tester

CORS Tester — debug cross-origin requests

Test cross-origin requests via proxy. Tentaco CORS Tester: review input and get an instant result — free, no sign-up.

Use the tool

Full tool — runs in your browser. No sign-up required.

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Does CORS Tester store my input?

Yes for this online mode. CORS Tester sends the data required for the request — see the privacy block.

Can I export the result?

Yes. Copy the output from CORS Tester or download it when the tool offers a file.

Which standards are supported?

CORS Tester follows the formats named in the UI and description. Unlisted variants are not guaranteed.

Can I use it offline?

CORS Tester needs a connection for online steps. Local parts may still work after load.