System tools

Experience realistic mechanical keyboard typing with authentic sounds and visual feedback

Test your keyboard's n-key rollover capability. Press multiple keys simultaneously to see how many keys your keyboard can register at once.

Test your QWERTY ANSI Windows keyboard. Press keys to see them light up, track key presses, and verify that all keys are working correctly.

Test your QWERTY ANSI 60% Windows keyboard. Compact 61-key layout without function keys, arrow keys, or numpad. Press keys to see them light up and verify all keys work correctly.

Test your QWERTY Russian Windows keyboard with Cyrillic characters. Press keys to see them light up, track key presses, and verify that all keys are working correctly. Based on the standard JCUKEN layout.

Test your QWERTY Estonian Windows keyboard with special Estonian characters (õ, ä, ö, ü). Press keys to see them light up, track key presses, and verify that all keys are working correctly. Based on the ISO layout.

Test your QWERTY Swedish Windows keyboard with special Swedish characters (å, ä, ö). Press keys to see them light up, track key presses, and verify that all keys are working correctly. Based on the ISO layout.

Test your QWERTY Finnish Windows keyboard with special Finnish characters (å, ä, ö). Press keys to see them light up, track key presses, and verify that all keys are working correctly. Based on the ISO layout.

Test your QWERTY Finnish/Swedish macOS keyboard with special Scandinavian characters (å, ä, ö) and Apple-specific keys. Press keys to see them light up, track key presses, and verify that all keys are working correctly. Features command, option, and control keys typical of Mac keyboards.

Generate customizable test print pages for printer calibration and quality testing. Create pages with color bars, grayscale gradients, alignment marks, text samples, and grid patterns.

Test your 5.1 surround sound speaker setup by playing test tones through each channel individually. Supports front left, front right, center, subwoofer, rear left, and rear right speakers.

Create ZIP archives from selected files directly in your browser.

Compare two files byte-by-byte to check if they are identical. Shows MD5 hashes and file sizes.

Calculate how many optical discs (CD-R, DVD-R, Blu-ray) you need to store a specific amount of data.

Fix stuck or dead pixels on your screen by rapidly cycling random colors over the affected area. Drag the healer box to the problem spot.

Visual explainer for Linux file permissions in numeric (octal) and symbolic notation with interactive checkboxes and chmod command output

Calculate Linux umask values and preview the resulting default permissions for new files and directories. Supports octal input, presets, and symbolic output.

List connected USB devices using the WebUSB browser API. View vendor ID, product ID, manufacturer, and serial number for each granted device.

Connect a RadiaCode over Bluetooth to see its serial number, firmware and bootloader versions, energy calibration, configuration file and register list.

Change RadiaCode settings from your browser over Bluetooth: language, sound, vibration, display brightness and timeout, units, alarm thresholds and alert triggers. Reset the accumulated dose too.

Convert file paths between Windows and Linux formats

View your browser fingerprint and all underlying signals reported by FingerprintJS, including canvas, audio, fonts, and hardware data.

Test which JavaScript APIs and browser features are supported in your current browser.

Check your current public IP address (IPv4 and IPv6) and view your fetch history.