User-Agent Switcher & Header Simulator
Copy search engine crawler bot strings, check mobile response structures, and verify user agent headers.
Test Crawl and Device Compatibility
Some web servers serve different code to search engine spiders or mobile devices. This user-agent switcher simulator lets you copy and test target headers to audit site responsiveness.
Key Benefits & Features
Bot Header Libraries
Lists strings for Googlebot and Bingbot.
Mobile Client Switch
Includes iOS iPhone agent headers.
Responsive Testing
Verify desktop vs mobile server outputs.
How to Use the User-Agent Switcher Auditor Step-by-Step
This utility runs entirely inside your browser using client-side JavaScript. We prioritize your security: none of your inputted text is logged or stored.
- 1
Select a target client header device (e.g. iPhone).
- 2
Copy the header text string.
- 3
Use it inside developer consoles to simulate device access.
Practical Examples
Select: Googlebot
Frequently Asked Questions (FAQ)
What is a user agent header?▼
A text string sent by browsers to web servers identifying the browser, version, and device OS.
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