Practical guides, tips, and tutorials to help you get the most out of free online tools.
Every Markdown syntax you need — headings, links, images, tables, code blocks, and more. Write and preview Markdown side by side.
Protein needs vary by age, activity level, and goals. Learn how to calculate your daily protein target for muscle gain, weight loss, or maintenance.
Create photo collages with custom layouts, spacing, and backgrounds — entirely in your browser. Perfect for social media, presentations, and memories.
Convert length, weight, temperature, volume, and speed between metric and imperial systems. Includes common conversion tables and shortcuts.
Visual noise meters help students self-regulate volume levels. How they work, when to use them, and the best free noise meters for teachers.
Crop photos to exact dimensions, standard ratios (16:9, 4:3, 1:1), or freeform shapes. Tips for composition and common crop sizes.
A practical guide to Base64 — what it encodes, why APIs and emails use it, and how to encode/decode strings and images instantly.
Percentage of a number, percentage change, percentage difference — every formula you need with examples and a free calculator.
Blur faces, license plates, or sensitive information in photos before sharing online. Quick, browser-based, no uploads to servers.
What epoch time is, why APIs use it, and how to convert between Unix timestamps and human-readable dates instantly.
BMI is the most used health metric in the world — and one of the most criticized. Learn how it's calculated, what it misses, and better alternatives.
Fair, fast, and fun ways to split students into groups. Avoid the drama of self-selection with animated group generators.
Resize images to exact pixels or percentages, maintain aspect ratios, and optimize for fast loading. Covers retina displays and responsive images.
Learn regular expressions through real-world examples — email validation, URL matching, phone numbers, and more. Test patterns live as you read.
What macros are, how to calculate yours for your goals, and why the protein/carb/fat ratio matters more than just calories.
Extract specific pages from a PDF or split it into individual files — entirely in your browser with no uploads to third-party servers.
Quick ways to check word count for essays, college applications, SEO content, and social media posts. Includes character and sentence counts.
The biggest color trends for 2026 — from Pantone's Cloud Dancer to digital-first palettes. Grab ready-to-use swatches for your next project.
Master linear, radial, and conic gradients in CSS. Copy-paste code examples and a visual generator to build gradients fast.
Set up distraction-free, visible exam timers for quizzes, midterms, and standardized tests. Tips for fair timing and reducing test anxiety.