Report A Bug

Found a test that will not load, a reading that looks wrong or a typo? Tell us and we will fix it. Your browser and screen details are added automatically, so it takes about two minutes.

2 minTo report

AutoDevice details

2 daysTypical reply

Tell Us What Went Wrong

Fields marked with an asterisk are required. One problem per report helps us fix it faster.

1. The problem

Type of problem *

Page or tool *Please choose where the problem happened.

Page link (optional)

How much does it affect you?

2. What happened

What happened? *0 / 3000Please describe the problem in at least 15 characters.

What did you expect? (optional)

Steps to repeat it (optional)

Screenshot or video link (optional)

3. Your device

Device

Browser and system

Include the technical details below. They help us reproduce the problem and contain no personal files or test results.

4. Get a reply

Name (optional)

Email (optional, for a reply)Please enter a valid email address, or leave it empty.

I agree that Screen Tester may use this report to fix the problem and contact me if I gave my email, as described in the Privacy Policy. *

Reports are delivered to info@screentester.co through the FormSubmit service. Never include passwords or payment details.

Thanks, Your Report Is In

We have received your bug report BUG-0000. Our team will try to reproduce it on a matching device and browser.

If you left your email, we will let you know when it is fixed.

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Known Limitations That Are Not Bugs

Some behavior comes from your browser, device or settings rather than from Screen Tester. Check this list first, it may save you a report.

IssueWhat you seeWhy it happensWhat to do

Full screen on iPhoneTests fill the browser window insteadSafari on iPhone does not allow full screen for web pagesTurn the phone sideways, or add the page to your home screen

Refresh rate shows 60 HzReading lower than your monitor ratingDisplay set to 60 Hz, battery saver, or window on another monitorSet the refresh rate in display settings and plug in the laptop

Patterns look soft or wavyOne-pixel lines blur or rippleBrowser zoom or non-whole-number display scalingPress Ctrl+0 or Cmd+0, or check the Sharpness test scaling card

Camera or mic not foundWebcam or microphone test stays blankPermission blocked, or another app is using the deviceAllow access in the browser and close video call apps

Flashing test waits to startA warning appears before the test runsA safety check for photosensitive epilepsyChoose I Understand to start, or use Gentle mode

Keep awake will not turn onScreen still sleeps on black or white screenBrowser does not support or refuses the requestChange sleep settings, or try Chrome, Edge or Safari

What Makes A Helpful Bug Report

The easier a problem is to repeat, the faster we can fix it. These details make the biggest difference.

One Problem Per Report

Send separate reports for separate problems, so each one can be tracked and fixed on its own.

The Exact Page

Choose the tool and paste the page link, so we open exactly what you were using.

Steps To Repeat It

List what you clicked or tapped, in order. If it only happens sometimes, say how often.

Expected Versus Actual

Tell us what should have happened and what you saw instead. Both halves matter.

A Screenshot Or Video

A quick screenshot or screen recording often explains a layout or display problem instantly.

Your Device Details

Leave the technical details ticked. Browser, screen size and pixel ratio explain most display bugs.

Other Ways To Get Help

Not a bug? These pages may be a better fit.

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Contact Us

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Bug Report FAQ

Answers to what people ask most before reporting a problem.

How do I report a bug on Screen Tester?

Fill in the form on this page: choose the tool, the type of problem and what happened. Your browser and screen details are added automatically, so it takes about two minutes.

Do I need to give my email address to report a bug?

No, email is optional. Add it if you would like a reply or an update when the problem is fixed. Without it, we still read and act on your report.

What information should a good bug report include?

The page or tool, what you did, what you expected and what happened instead. Steps to repeat the problem and a link to a screenshot help most.

Why does my refresh rate show 60 Hz?

Usually because the display is set to 60 Hz in system settings, battery saver or low power mode is on, or the browser window is on a different monitor. That is a setting rather than a bug. Check those first.

Why will full screen not work on my iPhone?

Safari on iPhone does not allow web pages to go fully full screen, so tests fill the browser window instead. This is a limit of iOS, not a bug in Screen Tester.

How long does it take to fix a bug?

Simple problems such as typos are often fixed within days. Device-specific problems take longer because we need to reproduce them first. If you leave your email, we will let you know when it is fixed.

Spotted Something Broken?

Two minutes is all it takes, and every report makes Screen Tester better.