Click "Start Camera" to begin scanning
Drop a QR code image here
or click to browse
Supports PNG, JPG, GIF, WebP
🔒 100% Private: All scanning happens in your browser. Images and camera feed never leave your device. We use the jsQR library for QR code detection.
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Key Features
Everything you need, right at your fingertips. Simple, fast, and built for everyone.
Camera Scan
Use your device camera to scan QR codes in real-time.
Beep Confirmation
Audio feedback when a QR code is successfully detected.
Clickable Links
Scanned URLs become clickable for instant navigation.
100% Local
All scanning happens in your browser —nothing is uploaded.
How to Use This QR Code Scanner
Getting started is easy. Just follow these simple steps.
Choose Method
Use your camera or upload an image file.
Position the QR Code
Hold camera steady or select a clear image.
Wait for Detection
Scanning is automatic —you will hear a beep.
View Result
See the decoded text, link, or data and take action.
About This QR Code Scanner
A QR code scanner reads QR codes and extracts the data encoded in them. QR (Quick Response) codes are two-dimensional barcodes that can store various types of data —URLs, text, contact information, Wi-Fi credentials, and more.
QR codes were invented in Japan in 1994 for tracking automotive parts during manufacturing. They have since become ubiquitous in marketing, payments, logistics, and everyday life. Their popularity comes from their fast readability and large storage capacity compared to traditional barcodes.
An online QR code scanner uses your device camera or lets you upload an image containing a QR code. It processes the image using computer vision algorithms to detect and decode the QR code pattern, then displays the encoded information.
Whether you need to scan a QR code from your computer, decode a QR code from a screenshot or image file, or just verify what a QR code contains before scanning it with your phone, an online QR scanner is a convenient tool to have.
Frequently Asked Questions
How do I scan a QR code with my camera?
Click "Start Camera" and allow camera access when prompted. Hold the QR code in front of your camera. The scanner will automatically detect and decode the QR code. Make sure the QR code is well-lit and centered in the frame.
Does this store my QR code data?
No. All QR code scanning happens entirely in your browser using the jsQR library. No images or scanned data are sent to any server. Your camera feed and images never leave your device.
Why isn't my camera working?
Make sure you've granted camera permission. Camera access requires a secure connection (HTTPS) —it won't work on plain HTTP on most browsers. If you're on mobile, try using Chrome or Safari. You can also use the "Upload Image" tab to scan QR codes from saved images.
How do you calculate time difference?
To calculate the difference between two times, subtract the start time from the end time. If the minutes go negative, borrow 1 hour (60 minutes). If crossing midnight, add 24 hours to the end time. For example, from 22:30 to 02:15 = (26:15 - 22:30) = 3 hours 45 minutes.
What is a unit of measurement?
A unit of measurement is a standard quantity used to express a physical quantity. Standard units like the metric system ensure consistency and comparability across different locations and contexts. The International System of Units (SI) is the most widely used system worldwide.
Why is the metric system better than imperial?
The metric system is decimal-based, making conversions much simpler by multiplying or dividing by 10, 100, 1000, etc. It is also more universally adopted, with almost every country in the world using it officially, making international communication and trade easier.
How do I convert units manually?
To convert units manually, find the conversion factor between the two units and multiply or divide accordingly. When converting from a larger unit to a smaller one, multiply. When converting from smaller to larger, divide. Always double-check your answer for reasonableness.
What are the seven base SI units?
The seven base SI units are: meter (length), kilogram (mass), second (time), ampere (electric current), kelvin (temperature), mole (amount of substance), and candela (luminous intensity). All other units are derived from these seven base units.
How accurate are online unit converters?
Online unit converters use precise conversion factors and are highly accurate for most practical purposes. Standard conversion factors are internationally defined and constant. However, for scientific or engineering work requiring extreme precision, always verify with authoritative sources.
What is dimensional analysis?
Dimensional analysis is a method of checking calculations by ensuring units of measurement are consistent on both sides of an equation. It can also be used to convert between units using conversion factors. This technique is widely used in physics, engineering, and chemistry.
Why is it important to use the right units?
Using the wrong units can lead to costly errors, miscommunication, and safety hazards. In construction, medicine, aviation, and space travel, unit errors have caused serious incidents and accidents. Always double-check units and clearly label them in all calculations and communications.
How do you calculate time difference?
To calculate the difference between two times, subtract the start time from the end time. If the minutes go negative, borrow 1 hour (60 minutes). If crossing midnight, add 24 hours to the end time. For example, from 22:30 to 02:15 = (26:15 - 22:30) = 3 hours 45 minutes.
What is a unit of measurement?
A unit of measurement is a standard quantity used to express a physical quantity. Standard units like the metric system ensure consistency and comparability across different locations and contexts. The International System of Units (SI) is the most widely used system worldwide.
Why is the metric system better than imperial?
The metric system is decimal-based, making conversions much simpler by multiplying or dividing by 10, 100, 1000, etc. It is also more universally adopted, with almost every country in the world using it officially, making international communication and trade easier.
How do I convert units manually?
To convert units manually, find the conversion factor between the two units and multiply or divide accordingly. When converting from a larger unit to a smaller one, multiply. When converting from smaller to larger, divide. Always double-check your answer for reasonableness.
What are the seven base SI units?
The seven base SI units are: meter (length), kilogram (mass), second (time), ampere (electric current), kelvin (temperature), mole (amount of substance), and candela (luminous intensity). All other units are derived from these seven base units.
How accurate are online unit converters?
Online unit converters use precise conversion factors and are highly accurate for most practical purposes. Standard conversion factors are internationally defined and constant. However, for scientific or engineering work requiring extreme precision, always verify with authoritative sources.
What is dimensional analysis?
Dimensional analysis is a method of checking calculations by ensuring units of measurement are consistent on both sides of an equation. It can also be used to convert between units using conversion factors. This technique is widely used in physics, engineering, and chemistry.
Why is it important to use the right units?
Using the wrong units can lead to costly errors, miscommunication, and safety hazards. In construction, medicine, aviation, and space travel, unit errors have caused serious incidents and accidents. Always double-check units and clearly label them in all calculations and communications.
About Units and Measurement
Units of measurement are fundamental to science, engineering, commerce, and daily life. They allow us to quantify the physical world, compare values, and communicate measurements accurately. Without standardized units, there would be confusion and chaos in everything from construction to cooking.
The metric system, officially known as the International System of Units (SI), is the most widely used measurement system in the world. Its decimal-based design makes conversions incredibly simple —just multiply or divide by powers of ten. This elegant simplicity is why almost every country has adopted it as their official system.
Time is the most precisely measured physical quantity. Modern atomic clocks are so accurate they lose only about one second every 100 million years. This precision enables technologies like GPS navigation, high-speed internet, and experiments that test the fundamental laws of physics.
Converting between units correctly is important in everyday life. Whether you are following a recipe from another country, planning a road trip abroad, or calculating medicine dosages, getting the conversion wrong can have serious consequences. Always double-check your work and use reliable conversion references.
Understanding scale and units helps you develop intuition about the world. Knowing roughly how much a kilogram weighs, how long a meter is, and how hot different temperatures feel makes you better at estimating, comparing, and making decisions without needing to measure everything precisely.