Responsive Tester Online — No Login, No Sign-Up Required
Tired of tools that force you to create an account before you can do anything? FlexyPdf's Responsive Tester requires zero registration. No email address, no password, no social media login, no "sign up to continue" popups. You open the page, use the tool, and you are done. Your privacy is protected because we never collect personal information — there is no account to create, no profile to manage, and no marketing emails to unsubscribe from. This makes our Responsive Tester ideal for quick one-time tasks and for users who value their privacy.
How to Use Responsive Tester
Enter URL
Type or paste the website URL you want to test for responsive design.
Choose Device
Select from preset device sizes (iPhone, iPad, Android, Desktop) or enter custom dimensions.
Preview & Test
View the website at the selected size. Switch between devices to compare layouts.
Features
Preset Devices
Test on popular device sizes including iPhone, iPad, Android phones, tablets, and desktops.
Custom Dimensions
Enter any custom width and height to test at specific resolutions.
Live Preview
See the website render in real-time at the selected viewport size.
Portrait/Landscape
Toggle between portrait and landscape orientations to test both modes.
Benefits of Using Responsive Tester
Completely Free
Use Responsive Tester without any cost, limits, or hidden fees. No premium plans needed.
No Installation
Works directly in your browser. No software downloads or plugins required.
100% Private
Your files and data are processed locally. Nothing is uploaded to external servers.
Works Everywhere
Compatible with Chrome, Firefox, Safari, Edge on desktop, tablet, and mobile.
No Sign-Up
Start using the tool immediately. No account creation or email verification.
Always Available
Access this tool 24/7 from anywhere in the world, on any device.
Frequently Asked Questions
Complete Your Developer Tools Workflow
These free tools work seamlessly with Responsive Tester to handle every step of your workflow.