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Cookie Header Builder

Generate one Set-Cookie response header, percent-encoding the value. SameSite=None and Partitioned require Secure; __Host- requires Secure, Path=/ and no Domain. Browser acceptance, public-suffix rules, expiry caps and CHIPS are not simulated; nothing is set in the browser.

cookie-header-builderLOCAL WORKSPACE

Enabling local controls…

Inputs and settings

Processed in this tab without uploading or storing inputs. Each text field is limited to 32 KiB and complete output to 1 MiB; additional format and model limits apply.

Results

Review the settings and run. Editing inputs clears old results.

Processing model and limits

Generate one Set-Cookie response header, percent-encoding the value. SameSite=None and Partitioned require Secure; __Host- requires Secure, Path=/ and no Domain. Browser acceptance, public-suffix rules, expiry caps and CHIPS are not simulated; nothing is set in the browser.

Data and model checked: MDN Set-Cookie ↗Source tool controls ↗

How to use this tool

Load the example, confirm field units and processing rules, then run locally. Editing any input clears the old result. Copy or download the complete output explicitly.

When not to use it

Generate one Set-Cookie response header, percent-encoding the value. SameSite=None and Partitioned require Secure; __Host- requires Secure, Path=/ and no Domain. Browser acceptance, public-suffix rules, expiry caps and CHIPS are not simulated; nothing is set in the browser.