Free Responsive Tester Online — 100% Free, No Hidden Costs

Use Responsive Tester for free online. No cost, no limits, no sign-up. Process files instantly in your browser. 100% free forever.

Width

Height

Viewport: 390 x 844

Enter a URL above to test responsiveness

Preview will appear here

Note: Some websites may block iframe embedding (X-Frame-Options). If a site doesn't load, try opening it directly in a new tab with the external link button.

Looking for a completely free responsive tester? FlexyPdf's Responsive Tester is 100% free with no hidden costs, no premium tiers, and no usage limits. Unlike other tools that restrict features behind paywalls or limit the number of free operations per day, our Responsive Tester gives you full access to every feature without spending a penny. There is no trial period — the tool is free today and will remain free. All processing happens locally in your browser, which means we have no server costs to pass on to you. Whether you need to use Responsive Tester once or a hundred times a day, it costs nothing.

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

Yes, FlexyPdf's Responsive Tester is completely free. No credit card, no sign-up, no premium plan. Every feature is available at no cost.

None. There are no daily limits, no file size caps, no watermarks, and no feature restrictions. Use it as much as you need.

All processing happens in your browser, so there are minimal server costs. We keep the tool free and support it through optional ads.

Yes. The core Responsive Tester tool will always be free. We believe essential tools should be accessible to everyone.

No. Our Responsive Tester includes all features — no watermarks, no reduced quality, no feature gates. You get the same functionality as expensive software.

Complete Your Developer Tools Workflow

These free tools work seamlessly with Responsive Tester to handle every step of your workflow.

Code Beautifier →

Format and beautify your code

CSS/JS Minifier →

Minify CSS and JavaScript code

JSON Formatter →

Format and validate JSON data

XML Validator →

Validate and format XML documents

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