Area Converter (www.oh-benri-tools.com)
An online tool for converting area units. Supports numerous units including square meters, square kilometers, and tatami mats, with customizable significant figures and rounding methods. Also supports area comparisons with familiar landmarks.
BMI Calculator (www.oh-benri-tools.com)
An online tool that calculates BMI by dragging sliders for height and weight. Displays body type classification in real time, with an option to download the result as an image.
Calculator (www.oh-benri-tools.com)
An online calculator for performing arithmetic calculations in a browser. Supports mouse or keyboard input, and multiple calculators can be used simultaneously. Also supports automatic sum and average calculation across multiple instances.
Length Converter (www.oh-benri-tools.com)
An online tool for converting length units. Supports numerous units including km, cm, mm, inches, feet, miles, and light years, with customizable significant figures and rounding methods.
Weight Converter (www.oh-benri-tools.com)
An online tool for converting weight units. Results in multiple units are displayed instantly after input, with customizable significant figures and rounding methods.
Color Code Converter (www.oh-benri-tools.com)
An online tool for converting between RGB (decimal), hexadecimal, RGBA, and CSS color formats. Instantly displays results in multiple formats in real time after input.
CSS Color Tester (www.oh-benri-tools.com)
An online tool for testing combinations of text color, box color, and background color with a color picker in real time. CSS output is automatically generated, making it useful for confirming web design color schemes.
HSL/HSV Color Picker (www.oh-benri-tools.com)
A color picker for adjusting HSL, HSV, RGB, and alpha values with sliders. Features color saving and history, and supports preset palettes including Material Design and Flat UI.
RGBA to RGB Converter (www.oh-benri-tools.com)
An online tool that calculates the final RGB value by combining an RGBA (transparent color) and a background RGB color. Useful for previewing how a transparent color will actually appear.
Character Counter (www.oh-benri-tools.com)
An online tool for counting characters in text. Supports drag-and-drop file input and multiple counting methods, including handling of newlines and double-byte characters. Includes conversion to manuscript page equivalent.
English Word Counter (www.oh-benri-tools.com)
An online tool for counting words, sentences, characters, and lines in English text. Supports file drop or direct text input, and input content is not sent to the server.
Bingo Game (www.oh-benri-tools.com)
An online tool for conducting bingo game draws in a browser. Numbers are shuffled when you start, and drawn numbers are displayed. Pairs with the Bingo Card tool to enjoy the full game.
