About the projectRuler. codethoi. com is an online tool for measuring the actual dimensions of objects directly in your browser. The project is positioned as a virtual ruler, available on...
Ruler. codethoi. com is an online tool for measuring the actual dimensions of objects directly in your browser. The project is positioned as a virtual ruler, available on any device with a screen. The main idea of the service is simple: replace a physical tool with a software solution that adapts to the user’s specific display.
The site offers measurements in three main systems: millimeters (mm), centimeters (cm) and inches. This makes it universal for various tasks - from household measurements to professional work of architects or designers. The tool works without installing additional programs; you just need to open the page in a modern browser.
The project focuses on the accuracy of digital measurements. Since each screen has its own pixel density characteristics, the site provides calibration mechanisms. The user can manually adjust the pixels per inch (PPI) to make the virtual scale match the actual dimensions.
To simplify setup, the developers suggest using standard objects as a standard:
The user compares the virtual line with the real object and adjusts the PPI value until it matches. The text gives an example: if the laptop screen has a resolution of 1366x768 with a physical size of 13.6 inches, the calculation gives about 100 pixels per inch, but for accuracy it is better to check and set a value like 100.7.
The tool interface supports different units of measurement and allows you to switch between them. There is a choice of fine gradations - from 18 to 132 inches. This is important for tasks that require high detail.
The site works on different platforms: Windows, Mac, Android and iOS. Support is provided by all modern browsers. However, there is an important condition: the page scaling must be set to 100. Changing the scale through the browser or system font size can distort the proportions, so it is recommended to use zoom gestures on mobile devices to adjust the image rather than changing system settings.
The project also stands out for its support for multiple languages. The list contains options from English and German to Amharic, Azerbaijani and other rare languages. This allows the tool to be used by people all over the world without a language barrier.
Accuracy depends on proper calibration.If the user adjusts the pixels per inch (PPI) using a real reference (such as a credit card or banknote), the result will be comparable to a physical instrument. Without manual verification, deviations may occur due to differences in screen matrices.
No. The tool runs entirely inside the browser. No plugins or additional applications are required. All you need to do is access the site from your computer or smartphone.
The site supports all major platforms: Windows, macOS, Android and iOS. The main requirement is to use a modern browser and a fixed page scale of 100 to display the scale correctly.
You need to find an object of known size (for example, a US dollar or an A4 sheet), compare it with a virtual ruler and change the pixels per inch value in the settings until the sizes match. After this, you can save the settings for further work.
Domain Name: CODETHOI.COM
Registrar: GMO Internet Group, Inc. d/b/a Onamae.com
Domain Status: active
Creation Date: 2019-04-04T17:00:09Z
Registry Expiry Date: 2027-04-04T17:00:09Z
Updated Date: 2025-01-05T17:50:55Z
Name Server: NS-A1.CLOUDNETVN.COM
Name Server: NS-A3.CLOUDNETVN.COM
Name Server: NS-A5.CLOUDNETVN.COM
REGISTRAR Contact: GMO Internet Group, Inc. d/b/a Onamae.com
>>> Last update of RDAP database: 2026-06-08T20:05:03Z
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