Starlight Tools

Free Online Calculators, Converters & Generators

Find the right tool among 609 fast, lightweight utilities for everyday tasks, work, study, and creative projects.

  • Free to use
  • Runs in your browser
  • No account required

Tool inputs and files are processed in your browser and are not sent to Starlight Tools. Advertising and analytics may process site-usage data according to your consent choices and our privacy policy.

Popular tools

Graphics Online whiteboard with drawing tools shapes colors and export button

Online Whiteboard

Quick sketches & diagrams; export as image. v1.0

Launch tool →
Molarity Calculator preview

Molarity Calculator

Calculate mass, molecular weight, volume, or concentration for chemical solutions. v1.1

Launch tool →
Fraction Pizza preview — visual fraction slices

Fraction Pizza

Visualize fractions with a friendly pizza—choose slices, click to fill, and see fraction/decimal/percent update. Challenge mode included. v1.0

Launch tool →
Time Since/Until Calculator

Time Since/Until Calculator

See how long since a date or how much time remains until a future date/time. v1.0

Launch tool →

Browse tools by category

Explore calculators, converters, and generators for images, documents, text, web development, finance, health, geometry, construction, time and date, science, and more. The complete directory remains available below, while each category page provides a focused view of its tools.

Browse the full catalog →

🎨 Image & Graphics (13 tools)

📄 PDF & Documents (9 tools)

✍️ Text Processing (12 tools)

💻 Web Development (26 tools)

💰 Financial Calculators (95 tools)

💪 Health & Fitness Calculators (15 tools)

📐 Geometry (33 tools)

🧮 Calculators (35 tools)

🏗️ Construction Tools (37 tools)

🕒 Time & Date Tools (36 tools)

🔬 Science & Engineering (88 tools)

🎛️ Studio Tools (18 tools)

🎲 Random Generators (22 tools)

🍳 Cooking & Kitchen Tools (15 tools)

🌱 Agriculture & Gardening Tools (20 tools)

🌍 Environment Tools (35 tools)

🚚 Logistics & Supply Chain (24 tools)

🖥️ Infrastructure & Systems (43 tools)

🎮 Games (15 tools)

🎉 Fun Calculators (18 tools)

Latest Updates

🌟 June 30, 2026: Starlight Tools has now crossed 600 tools sitewide. Thank you for helping this collection keep growing across calculators, generators, converters, and browser-based utilities.
🌟 June 13, 2026: Starlight Tools is 1 year old. Thank you for using the site and helping us grow this collection of free, privacy-first browser tools. See the anniversary artwork on our Fan Art and Wallpapers page.
🌟 April 20, 2026: Some of our calculators are getting a v1.1 upgrade with more features, clearer results, and smoother browser-based workflows.
🌟 April 4, 2026: As Starlight Tools continues to grow, we’re rolling out stronger quality-control checks across our tools and website to improve consistency, reliability, and the overall experience.
🌟 March 30, 2026: We’ve now crossed 500 tools sitewide. Thank you for using Starlight Tools as we keep expanding the collection with more privacy-first, browser-based tools.

Read all update notes →

About Starlight Tools

Learn more about how we build privacy-first tools and the policies that keep the site simple and safe.

Privacy Terms About