Generate CORS headers for your API by configuring allowed origins, methods, and headers. Everything runs locally in your browser — nothing is uploaded.
Full-featured API client that runs in your browser — make HTTP requests, edit headers/body/params, save collections, generate code snippets (cURL/Fetch/Axios). Your API keys never touch a server — everything runs locally.
Build HTTP requests with custom method, URL, headers, and body. Generate equivalent curl commands. Everything runs locally in your browser — nothing is uploaded.
Generate realistic mock JSON data from a schema description. Ideal for rapid API prototyping and frontend development without a backend.
Add professional headers and footers to every page of your PDF. Supports text, page numbers ({{page}}/{{total}}), dates, and custom alignment. Perfect for reports and official documents.
Generate large ASCII text banners with multiple font styles — perfect for terminal headers and text art.
CORS Header Generator lets you generate CORS headers for your API by configuring allowed origins, methods, and headers. Everything runs locally in your browser — nothing is uploaded.. It works on any device with a modern web browser.
Generate CORS headers for your API by configuring allowed origins, methods, and headers. Everything runs locally in your browser — nothing is uploaded. It runs entirely in your browser — no software installation or data uploads required.
Configure your settings below — the output generates instantly.
Yes. After the initial page load, CORS Header Generator runs entirely on your device with no internet connection needed. All processing is done locally.
Generate CORS headers for your API by configuring allowed origins, methods, and headers. All processing runs locally — no code is sent to any server.
Tools cover JavaScript, CSS, HTML, SQL, Python, JSON, XML, CSV, and more. Check the tool description for specifics.
Yes. Since processing is local, performance depends on your device. Most operations handle large files without issue.
Yes. Formatters use well-known libraries (sql-formatter, Prettier-compatible patterns) and follow widely adopted rules.