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Header Builder - Free Online HTTP Request Header Tool | IconVault

Build raw HTTP request headers from common presets and custom fields, with name validation and one-click copy. Free, fully in your browser.

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Header Builder

Build raw HTTP request headers from presets, validated and copy-ready

5 of 5 free uses left

Common request headers - click to add or remove

Custom header

Your header block (2)

Raw block

Content-Type: application/json
Accept: application/json

5 of 5 free copies left - header names are validated against RFC 7230, entirely in your browser.

About this tool

IconVault's Header Builder helps you compose raw HTTP request headers without typos. Pick from common presets like Authorization, Content-Type, Accept, Cache-Control, Origin and If-None-Match, add your own custom fields, and copy the finished block straight into curl, Postman, Insomnia or your API client.

Every header name is validated as you type, so malformed names are caught before they ever reach your request. It is free, needs no signup, and everything runs in your browser, so tokens and API keys you type never leave your device. Honest note: it builds the header block; it does not send the request, which keeps your credentials local.

Frequently asked questions

Popular searches

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