Starlight Tools mascot star Starlight Tools — Free Online Calculators, Converters, Generators & Image Tools

Starlight Tools offers over 500 free, privacy-preserving, lightweight browser-based tools — including calculators, converters, and random generators — for image editing, PDFs, web development, text, time & date, finance, and science. Everything runs locally using JavaScript — nothing is uploaded, and your files never leave your computer. Our growing collection covers image editing, PDF and document utilities, calculators, finance tools, agriculture & gardening tools, web development helpers, text processing, time & date tools, and science & research calculators. All tools are fast, ad-minimal, and built for instant results.
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Our top tools searched in Google

Graphics Online whiteboard with drawing tools shapes colors and export button

Online Whiteboard

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

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Molarity Calculator preview

Molarity Calculator

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

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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

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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

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🎨 Image & Graphics (13 tools)

📄 PDF & Documents (7 tools)

✍️ Text Processing (12 tools)

💻 Web Development (26 tools)

💰 Financial Calculators (87 tools)

💪 Health & Fitness Calculators (15 tools)

📐 Geometry (32 tools)

🧮 Calculators (30 tools)

🏗️ Construction Tools (24 tools)

🕒 Time & Date Tools (36 tools)

🔬 Science & Engineering (66 tools)

🎛️ Studio Tools (13 tools)

🎲 Random Generators (22 tools)

🍳 Cooking & Kitchen Tools (15 tools)

🌱 Agriculture & Gardening Tools (20 tools)

🌍 Environment Tools (23 tools)

🚚 Logistics & Supply Chain (23 tools)

🖥️ Infrastructure & Systems (12 tools)

🎮 Games (15 tools)

🎉 Fun Calculators (18 tools)

Latest Updates

🌟 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.

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About Starlight Tools

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

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