8 min readDeveloper
20 Free Online Developer Tools You'll Actually Use
A hand-picked roundup of 20 free, browser-based developer tools — formatters, encoders, generators, diff checkers, and converters that run locally with no sign-up.
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Practical guides, tutorials, and tips for developers and everyday users. Learn how to get the most out of free online tools.
5 min readConverters
Temperature Conversion: Celsius, Fahrenheit, and Kelvin
Learn how to convert between Celsius, Fahrenheit, and Kelvin with simple formulas, worked examples, handy reference points, and a quick mental shortcut.
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Metric and Imperial Unit Conversion: A Practical Guide
Confused by miles versus kilometers or pounds versus kilograms? This practical guide covers length, weight, volume, temperature, and speed, with quick conversion tips.
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How to Convert Colors: HEX, RGB, and HSL
Web colors come in HEX, RGB, and HSL. Learn how each format works, how to convert between them by hand, and how to switch instantly with a free online tool.
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How Computers Store Text: ASCII, Unicode, and UTF-8
Computers only store numbers, so text needs an encoding. Learn how ASCII, Unicode, and UTF-8 turn letters and emoji into bytes, and why garbled text happens.
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Data Storage Units Explained: KB, MB, GB, and the 1000 vs 1024 Confusion
Understand bits, bytes, and the units that measure them. Learn why KB, MB, and GB sometimes mean 1000 and sometimes 1024, and why your hard drive looks smaller.
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How to Calculate a Discount and Sale Price
Learn how to calculate a discount and sale price with simple formulas, mental-math shortcuts, percent-off reversals, stacked discounts, and sales tax, plus a free calculator.
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Word Count, Reading Time, and Readability Explained
Learn what word count, character count, reading time, and readability scores actually mean, how each is calculated, and how to use them to write clearer, better-targeted content.
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How a Diff Checker Works: Comparing Text and Code
Understand how a diff checker compares two blocks of text or code line by line, what the green and red colors mean, and when to reach for a unified or side-by-side view.
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How to Calculate Percentages: A Practical Guide
Learn what percentages mean and how to calculate them: finding a percent of a number, reverse percentages, percentage change, mental shortcuts, and common mistakes.
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Time Zones Explained: UTC, GMT, and Converting Times
Understand why time zones exist, how UTC differs from GMT, how offsets and daylight saving time work, and how to convert times across zones without mistakes.
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What Is Lorem Ipsum? The Story Behind Placeholder Text
Discover what Lorem Ipsum is, its surprising origin in a 2,000-year-old Latin text, why designers use placeholder text, when to avoid it, and how to generate it instantly.
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Morse Code: A Complete Beginner's Guide
Learn what Morse code is, how dots and dashes work, the alphabet and numbers, why SOS was chosen, where it is still used today, and how to translate it instantly.
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Roman Numerals Explained: How to Read and Write Them
A clear guide to Roman numerals: the seven symbols and their values, the additive and subtractive rules, how to read and write any number, common mistakes, and a free converter.
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Number Bases Explained: Binary, Octal, Decimal, and Hexadecimal
Understand number bases from the ground up: how decimal, binary, octal, and hexadecimal work, how to convert between them, and where each one shows up in computing.
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camelCase vs snake_case vs kebab-case: Naming Conventions Explained
A clear guide to camelCase, PascalCase, snake_case, SCREAMING_SNAKE_CASE, and kebab-case: what each style looks like, which languages use it, and when to pick which.
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Cron Expressions Explained: A Beginner's Guide
A beginner-friendly guide to cron expressions: what the five fields mean, the special characters, worked examples, common gotchas, and how to translate any schedule to plain English.
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How to Convert CSV to JSON (and Back) — A Practical Guide
Learn how CSV and JSON map to each other, how to handle headers, delimiters, quoting, and types, and how to convert between them for free with in-browser tools.
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What Is URL Encoding? Percent-Encoding Explained
URL encoding (percent-encoding) lets you safely put spaces, symbols, and Unicode into a web address. Learn how it works, which characters need it, and the encodeURI vs encodeURIComponent gotcha.
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What Is a UUID? v1 vs v4 (and v7) Explained
UUIDs are 128-bit identifiers used everywhere from databases to APIs. Learn what they are, how v1, v4, and the newer v7 differ, how unique they really are, and when to use each.
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What Is Hashing? MD5 vs SHA-256 Explained (2026)
Hashing turns any input into a fixed-length fingerprint — but not all hash functions are equal. Learn what a hash is, why MD5 is broken, why SHA-256 is the modern standard, and how hashing differs from encryption.
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How to Generate a Strong Password in 2026 (And Why Length Beats Complexity)
A strong password is your first and cheapest line of defense. Learn the modern rules — length over complexity, passphrases, and why every account needs its own — plus how to generate one in seconds with a free online tool.
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Markdown Guide for Beginners: Syntax, Examples, and Free Online Preview
Learn Markdown from scratch: headings, links, images, lists, code blocks, tables, and more. See your Markdown rendered in real time with a free online preview tool.
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Color Theory for Web Developers: Hex, RGB, HSL, and Picking the Right Palette
A practical guide to color formats in CSS, converting between hex and RGB, understanding HSL, building accessible color palettes, and using free online color tools.
Read article8 min readCalculators
How to Calculate Mortgage Payments: Formula, Examples, and Free Calculator
Understand the mortgage payment formula, see worked examples for 15-year and 30-year loans, learn what affects your monthly payment, and calculate yours instantly for free.
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JWT Tokens Explained Simply: A Beginner-Friendly Guide
Understand what JWT tokens are, how they work, why they are used for authentication, how to decode them, and common security pitfalls every developer should know.
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CSS Minification Explained: How to Minify CSS for Faster Websites
Learn what CSS minification is, why it matters for page speed and SEO, how it works under the hood, and how to minify your CSS for free with an online tool.
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How to Format JSON Online — A Complete Guide
Learn how to format, validate, and beautify JSON data using a free online tool. Covers common JSON errors, formatting best practices, and real-world use cases for developers.
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What Is Base64 Encoding and How to Use It
A developer-friendly explanation of Base64 encoding: what it is, when to use it, common pitfalls, and a free online tool to encode or decode Base64 strings instantly.
Read article7 min readCalculators
How to Calculate BMI: Formula, Chart, and Free Calculator
Understand the BMI formula, what your BMI number means, BMI chart categories, limitations of BMI, and calculate yours for free with our online BMI calculator.
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Regular Expressions Cheat Sheet with Online Tester
A practical regex cheat sheet covering syntax, quantifiers, groups, lookaheads, and common patterns. Test your regular expressions instantly with the free online regex tester.
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Unix Timestamp Converter: What It Is and How to Convert
Everything you need to know about Unix timestamps: what they are, how they work, common pitfalls, and how to convert between timestamps and human-readable dates for free.
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