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Circular Segment Area Calculator

Calculate the area of a circular segment using chord length and height, or radius and central angle. Ideal for math education and engineering design.

Standard Paper Size to Pixels Converter

A paper size to pixels converter based on the Chinese GB/T 148-1997 standard, supporting DPI calculations for common sizes like A4 and A3.

JPG to ICO Converter

Free online JPG to ICO converter. Easily convert JPG images into multi-size ICO files containing up to 6 different dimensions for favicons and desktop icons.

Line Chart Generator

Free online line chart maker. Input your data to instantly generate custom line graphs. Customize titles, colors, and download as PNG to visualize trends.

Annulus Area Calculator

Quickly calculate the area of an annulus by entering the inner and outer radii. Ideal for math education and engineering drafting.

Online Bar Chart Generator

Enter your data to instantly generate a clear bar chart. This free online tool supports custom labels, colors, and titles for easy data visualization.

Letter Icon Generator

Input text to quickly generate circular or rounded square letter icons suitable for website icons, avatars, UI elements.

Donut Chart Maker

Generate custom donut charts online. Easily customize data, colors, and labels to visualize proportions and percentages intuitively.

Stadium Area Calculator

Calculate the area of a standard track or stadium shape. Enter the straightaway length and radius for fast, accurate results.

Rounded Image Generator

Easily add rounded corners to images online for free. Customize the border radius and export high-quality PNGs with transparent backgrounds instantly.

Placeholder Image Generator

Quickly generate custom placeholder images with specific sizes, colors, and text. Perfect for web prototyping, documentation, and frontend development.

GIF Splitter

Split GIFs frame by frame online and quickly export high-quality static images.

Regular Pentagon Area Calculator

Calculate the area of a regular pentagon based on its side length, perimeter, or diagonal. Ideal for math studies and engineering calculations.

Triangle Area Calculator

Calculate the area of a triangle using base and height, two sides and the included angle, or Heron's formula. Ideal for math studies and engineering measurements.

Circle Image Generator

Quickly crop images into perfect circles for profile pictures or icons. Supports transparent backgrounds and custom colors.

Rectangle Area Calculator

Enter the length and width to automatically calculate the area of a rectangle. Ideal for math learning and engineering measurements.

Business Card Size to Pixels Converter

Convert physical business card dimensions to pixel values. Supports custom DPI settings for both print design and screen display scenarios.

Regular Polygon Area Calculator

Enter the number of sides and side length to quickly calculate the area of any regular polygon. Ideal for geometry students and engineering calculations.

ID & Passport Photo Checker

Smartly check passport and ID photo compliance and adjust dimensions to ensure they meet official standards for visas, exams, and applications.

Passport & ID Photo Maker

AI ID photo generator with precise background removal. Supports international standard sizes and custom parameters with secure local processing.