Cookie Header Generator

Construct valid HTTP Cookie and Set-Cookie header strings instantly with custom attributes and flags.

Set-Cookie: session_id=abc123xyz789; Max-Age=86400; Path=/; SameSite=Lax; Secure; HttpOnly

Header Attributes Reference

1. HttpOnly

Prevents client-side scripts (like JavaScript via document.cookie) from accessing the cookie, mitigating XSS risks.

2. SameSite

Controls whether cookies are sent with cross-site requests, providing protection against Cross-Site Request Forgery (CSRF).

3. Secure

Ensures the cookie is only transmitted over encrypted (HTTPS) connections.

Cookie Header Generator is a browser-based developer utility that helps you work with its relevant input and output without installing a separate desktop application.

How to use this tool

Enter or paste the required input, select the available options, then review the result before copying or applying it in your project. Test the result in its target environment when accuracy matters.

Use a realistic sample that is small enough to inspect. Check the tool’s assumptions before relying on its result.

Work through one representative case

  1. Run a small example first and compare the output with an expected value before trying a larger case.
  2. Pay attention to these page fields: Header Type, Cookie Name, Cookie Value. Confirm which fields are inputs, options, or output areas before processing.
  3. Follow the action provided by the page after entering the required input; check the field labels so source values and generated results are not confused.
  4. Confirm the result in the application or environment that will use it. The page only evaluates the information supplied here.

Check the result in its intended context

Browser behavior and CSS support can differ by engine and version. Inspect the result in the browsers and viewport sizes your project supports.