How to Scan a QR Code on Your Computer

The fastest way to scan a QR code on your computer

You can scan a QR code on your computer using your built-in webcam and a free web tool, or by taking a screenshot and uploading it to a QR decoder. The simplest route is to use your browser: open a site like QR Code Reader (qrcoderreader.com) or Scan QR Code Online (scanqrcode.today), allow camera access when prompted, and point your webcam at the code. The site reads it in seconds and shows you the link or text inside.

If the QR code is on paper or a screen in front of you, this method works best. If the code is already saved as an image file on your computer, you can skip the camera step and upload the image directly to the same sites — most have an upload button next to the camera option.

Key Takeaways

Web-based QR readers like QR Code Reader and Scan QR Code Online work in any browser and need only camera permission to read codes in real time.
If you have a screenshot or saved image of a QR code, upload it to a decoder site instead of using your webcam.
Windows 11 and newer versions include a built-in QR scanner in the Snipping Tool — no third-party site needed.
On Mac, the native Preview app can read QR codes from image files without opening a browser.
Some password managers and authenticator apps have QR scanners built in if you are reading codes for account setup.

Using your browser and a free web decoder

Open any browser and go to qrcoderreader.com or scanqrcode.today. Both sites are free and do not require you to create an account. Click the button that says "Start Scanning" or "Use Camera" — your browser will ask for permission to use your webcam. Click "Allow."

Hold the QR code steady in front of your webcam. The site will detect it automatically and display the result — usually a URL, text, or contact information — within one or two seconds. You can then click the link, copy the text, or save the information. If the code does not scan, move closer or adjust the angle slightly.

If you prefer not to use your webcam, both sites also have an upload option. Click "Upload Image" or the folder icon, select a screenshot or photo of the QR code from your computer, and the site will decode it the same way.

Windows 11: using the built-in Snipping Tool

Windows 11 includes a QR scanner in the Snipping Tool, which is built into the operating system. Press Windows key + Shift + S to open the screenshot tool, or search for "Snipping Tool" in the Start menu and open it.

In the Snipping Tool window, look for the QR code icon in the toolbar at the top. Click it, then point your webcam at the QR code. The tool will read it and display the result in a small window. You can copy the link or text directly from there. This method is faster than opening a browser if you scan codes often.

Mac: using Preview to read QR codes from images

If you have a saved image of a QR code on your Mac, open it in Preview (the default image viewer). Right-click the image and select "Look Up QR Code," or go to the Tools menu and choose "Look Up QR Code." Preview will decode it and show you the result — usually a link you can click directly.

Preview does not have a live camera scanner like Windows 11, so this method works only for QR codes you have already saved as image files. If you need to scan a physical code, use a web decoder like the ones listed above instead.

Using your phone to scan codes on a computer screen

If your computer is displaying a QR code on its screen, the fastest option is often to use your phone's built-in camera. Most modern phones — iPhone, Android, and others — can read QR codes directly from the camera app without opening a separate tool. Point your phone's camera at the screen, and a notification will appear with the link or information inside the code.

This is useful when you are setting up two-factor authentication or logging into a service that displays a QR code. You do not need to install anything; the camera app handles it automatically.

Authenticator apps and password managers with QR scanners

If you are scanning a QR code to set up two-factor authentication, your authenticator app or password manager may have a built-in scanner. Apps like Microsoft Authenticator, Google Authenticator, Authy, and 1Password all include QR readers. Open the app, look for a button labeled "Scan" or a camera icon, and point your webcam at the code. The app will read it and add the account automatically.

Using the app's scanner is often simpler than a web decoder because the result goes directly into your account setup instead of displaying as text you have to copy. This is the standard method for setting up two-factor codes on most services.

What to do if a QR code will not scan

If a code refuses to scan, the most common causes are poor lighting, a blurry image, or damage to the code itself. Move to a brighter area, clean your webcam lens if it is dusty, and hold the code steady. If the code is printed on paper, make sure it is not creased or faded.

If you are using a web decoder and the camera is not working, check that you gave the site permission to use your webcam. In most browsers, you can see this in the address bar — look for a camera icon with a slash through it, click it, and select "Allow." If the code is severely damaged or partially obscured, it may not be readable; in that case, ask for a new copy or a different format (like a link instead of a code).

Frequently Asked Questions

Do I need to install software to scan a QR code on my computer?

No. Web decoders like QR Code Reader work in any browser without installation. Windows 11 has a built-in scanner in the Snipping Tool. Mac users can use Preview for saved images. You only need to install something if you want a dedicated app, which is optional.

Is it safe to scan QR codes from unknown sources?

QR codes themselves are safe — they are just data. The risk is in what the code links to. Before clicking a link from a scanned code, check the URL that appears. If it looks suspicious or you do not recognize the domain, do not click it. Treat QR codes the same way you would treat a link someone sent you by text or email.

Can I scan a QR code if it is on my phone screen?

Yes, but it is awkward. You would need a second device or a mirror to point your webcam at your phone. It is easier to use your phone's native camera to read the code directly, or to use a web decoder on your computer and have your phone scan the code from your screen instead.

What if the QR code contains a file or document?

Most QR codes contain links or text, not files. When you scan it, you will see a URL. Click the link to read or view the file. Some codes contain contact information or WiFi credentials instead — the decoder will show you what is inside before you do anything with it.

Can I scan multiple QR codes at once?

No. Web decoders and built-in tools scan one code at a time. If you have many codes to read, scan them one by one. If you need to decode codes in bulk, some desktop software exists for that purpose, but it is rarely necessary for personal use.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.