Image Optimization for the Web: Formats, Compression, and Best Practices
Why images are the #1 cause of slow websites, which format to use (JPEG, PNG, WebP, AVIF), and how to compress without visible quality loss.
BoxTool Editorial
Guides
In-depth Guides
Long-form guides on the ideas behind our most-used tools: how they work, when to use them, and the math underneath.
Markdown Cheatsheet: Every Syntax You Need to Know
A complete, practical reference for Markdown — headings, links, code blocks, tables, and the extensions that power GitHub, Notion, and Obsidian.
BoxTool Editorial
How Loan Amortization Works: A Complete Guide to Mortgage and Loan Math
Why most of your early mortgage payments go to interest, how to calculate your monthly payment, and what happens when you pay extra.
BoxTool Editorial
Percentage Math: Every Formula You Need in One Place
Percentage of a number, percentage change, reverse percentages, compound percentages — every formula explained with clear examples.
BoxTool Editorial
How Age Is Calculated: Why Birthdays Are More Complex Than You Think
Exact age calculation across leap years, time zones, and cultural differences — plus why your age changes at different times depending on where you live.
BoxTool Editorial
Working Across Time Zones: A Practical Guide to Global Scheduling
How time zones work, why UTC matters, the DST trap, and how to schedule meetings without accidentally waking someone up at 3 AM.
BoxTool Editorial
Word Count, Reading Time, and Readability: A Writer's Guide
How reading time is calculated, what Flesch-Kincaid scores mean, and how to use word count effectively when writing for the web.
BoxTool Editorial
URL Encoding Explained: Percent-Encoding and Why It Matters
Why URLs can't contain spaces or special characters, what percent-encoding does, and when you need to encode or decode a URL.
BoxTool Editorial
Color Spaces Explained: HEX, RGB, HSL, and When to Use Each
Why do designers use HSL while developers reach for HEX? A clear breakdown of every color format and how to convert between them.
BoxTool Editorial
Metric vs. Imperial: The Complete Unit Conversion Cheatsheet
Quick-reference formulas and context for every common unit conversion — length, weight, temperature, volume, and more.
BoxTool Editorial
How to Interpret Your BMI: A Complete, Balanced Guide
BMI is a useful screening tool, but it has real limitations. Learn what your number actually means, what it misses, and what health professionals look at instead.
BoxTool Editorial
Base64 Encoding Explained: What It Is, How It Works, and When to Use It
Base64 is everywhere in web development — in JWTs, data URLs, email attachments, and API keys. Here's how it actually works.
BoxTool Editorial
JSON Formatting and Validation: A Practical Guide for Developers
How to read, write, and debug JSON effectively — plus common mistakes, validation tips, and best practices for APIs.
BoxTool Editorial
How to Create Strong Passwords: A 2026 Security Guide
What makes a password uncrackable, how modern attacks work, and how to generate and manage strong passwords without going insane.
BoxTool Editorial
The Complete Guide to QR Codes: How They Work and How to Use Them
Everything you need to know about QR codes — how they encode data, what the different types mean, and how to generate one for free.
BoxTool Editorial