5 min
Why does my 1TB hard drive only show 931GB?
Nothing is missing and nobody is cheating you. Your drive and your operating system are counting in two different number systems.
Articles
Practical explanations
The questions behind the tools, answered properly. No filler, no listicles, just the explanation you were actually looking for when you searched.
5 min
How long should a password actually be?
Length beats complexity by a wide margin, and most of the rules websites impose make passwords weaker rather than stronger.
5 min
WebP, JPEG or PNG: which should you actually use?
A practical decision guide, plus the two mistakes that waste more bandwidth than choosing the wrong format ever will.
4 min
Why is my JSON invalid when it looks perfectly fine?
Four small differences between JSON and JavaScript account for the overwhelming majority of parse failures, and error messages point at the wrong line.
5 min
The cron mistake that runs your job far more often than you intended
When both day fields are restricted, cron runs the job if either matches, not both. This is not a bug, and it surprises nearly everyone.
5 min
What does a matching checksum actually prove?
It reliably catches corruption. It proves considerably less about tampering than most people assume, and the reason is worth understanding.
5 min
Why 20% off plus another 20% off is not 40% off
Two 20% discounts give you 36% off, not 40%. The gap widens as the discounts grow, and the arithmetic is worth knowing before you shop a sale.
4 min
What does 4d6kh3 mean? Dice notation explained
The compact grammar behind every tabletop game, plus the probability difference between rolling one d20 and rolling three d6.
5 min
How Many Words Is That? A Practical Guide to Word Count
What a word count actually measures, how many words fit on a page, and the counts that matter for essays, articles and search.
5 min
Uppercase, lowercase, Title Case: Convert Text Case Without Retyping
The difference between the common text cases, when each is correct, and how to switch between them in one click instead of retyping.
5 min
How to Compare Two Texts and Spot Every Difference
Why eyeballing two versions fails, how a diff tool highlights every change, and the everyday jobs it makes trivial.
5 min
What Is Lorem Ipsum and Why Designers Still Use Placeholder Text
Where the strange Latin comes from, why designers fill layouts with it, and when placeholder text helps versus when it hurts.
5 min
How to Reverse Text, Words, or Lines (and Why You'd Want To)
The difference between reversing characters, words and lines, plus the practical and playful reasons people do it.
4 min
How to Remove Duplicate Lines from a List Instantly
Why duplicates creep into lists, how automatic de-duplication works, and how to clean thousands of lines in seconds.
5 min
Find and Replace Online: Bulk-Edit Text Without Opening an Editor
How find-and-replace works, when to use plain text versus regular expressions, and how to change every occurrence safely.
4 min
Turn Text into Natural Speech in Your Browser, Free
How browser text-to-speech works, why it is free and private, and the practical ways listening to your text beats reading it.
5 min
Character Count for Tweets, Meta Descriptions & SMS: Why Limits Matter
Why so many fields cap characters rather than words, the limits worth memorising, and how to write to them without cutting corners.
5 min
Clean Up Messy Text: Fix Spacing, Line Breaks and Formatting Fast
Where messy text comes from, the fixes that solve 90% of it, and how to clean a pasted mess in one pass.
5 min
How to Compress Images Without Losing Quality
Why image files get so large, the difference between lossy and lossless compression, and how to shrink photos while keeping them sharp.
5 min
How to Resize an Image to Exact Dimensions Without Stretching It
What resolution really means, how aspect ratio keeps images from distorting, and how to hit an exact pixel size cleanly.
5 min
What Is a Base64 Image and When Should You Inline One?
How Base64 turns an image into text, why you would embed one directly in code, and when it helps versus when it hurts performance.
4 min
How to Crop an Image to the Right Aspect Ratio
The difference between cropping and resizing, the aspect ratios that matter, and how to crop for social, print and profile pictures.
4 min
PNG, JPG, WebP: How to Convert Between Image Formats
What actually happens when you convert an image, which conversions are safe, and how to pick the destination format for the job.
5 min
How to Get the Exact Hex Color from Any Image
How pixels store colour, why an eyedropper beats guessing, and how to pull an exact hex code from any photo or screenshot.
5 min
Apply Filters to Photos in Your Browser: Brightness, Contrast, Blur and More
What each common adjustment actually does, the order to apply them in, and how to improve a photo without special software.
4 min
How to Make a Favicon That Looks Right in Every Browser Tab
What a favicon is, the sizes and formats that matter, and how to make one that stays crisp from a browser tab to a phone home screen.
5 min
How to Make a Meme: Top and Bottom Text Done Right
The anatomy of the classic meme, why the white-outlined text style exists, and how to make one that reads instantly.
5 min
How to Watermark Images to Protect Your Work
What watermarks can and cannot do, how to balance visibility against ruining the image, and how to add one without uploading your photos.
5 min
Base64 Encoding Explained: What It Is and When to Use It
What Base64 actually does, why it is not encryption, and the everyday jobs it solves for developers.
5 min
URL Encoding Explained: Why Spaces Become %20
What percent-encoding is, which characters need it, and why getting it wrong breaks links and query strings.
5 min
How to Decode a JWT (and Why You Should Never Paste One Online)
The three parts of a JSON Web Token, what the claims mean, and why the tool you use to decode one matters for security.
5 min
Why You Should Format Your HTML (and What a Formatter Actually Does)
How proper indentation reveals structure, why minified HTML is unreadable, and how a formatter makes markup maintainable again.
4 min
CSS Minification: How Removing Whitespace Speeds Up Your Site
What minification removes, how much it saves, and where it fits alongside concatenation and compression.
5 min
JavaScript Minification: Smaller Bundles, Faster Load Times
How minifying JavaScript differs from minifying CSS, why it saves more, and how it fits with modern bundling.
5 min
Why Formatting Your SQL Makes Queries Easier to Read and Debug
How consistent formatting reveals a query's logic, why long queries become unreadable, and what a formatter standardises.
5 min
Markdown Explained: Write Formatted Text Without a Word Processor
What Markdown is, the handful of symbols that do everything, and why it has become the default for developers and writers.
5 min
HTTP Status Codes Explained: What 404, 301 and 500 Really Mean
How the five classes of status code work, the ones you will actually meet, and what each tells you about a request.
5 min
Metric to Imperial: How Unit Conversion Actually Works
The idea behind every unit conversion, the everyday metric-imperial pairs worth knowing, and how to avoid the classic conversion mistakes.
5 min
Celsius, Fahrenheit and Kelvin: How to Convert Temperature
Why temperature conversion needs an offset as well as a factor, the formulas, and quick tricks for estimating in your head.
5 min
How to Convert CSV to JSON (and Why the Structure Changes)
How a flat spreadsheet becomes structured JSON, the choices that shape the output, and the pitfalls that break a conversion.
5 min
Unix Timestamps Explained: Converting Epoch Time to a Date
What a Unix timestamp is, why computers count seconds from 1970, and how to convert epoch time to a readable date.
5 min
Binary, Decimal, Hex: How to Convert Between Number Bases
What a number base really is, why computers use binary and hex, and how to convert between them with confidence.
5 min
How Roman Numerals Work and How to Convert Them
The seven letters, the subtraction rule that trips everyone up, and where Roman numerals still appear today.
5 min
How Currency Conversion Works (and Why Rates Keep Moving)
What an exchange rate really is, why it changes constantly, and the hidden costs to watch when converting money.
4 min
Time Zones Explained: Converting Times Across the World
How time zones work, why UTC is the anchor, and how to convert a time across the world without getting caught by daylight saving.
5 min
What Is ASCII? Converting Text to Character Codes
How computers turn letters into numbers, what ASCII covers, and how Unicode extended it to every language and emoji.
5 min
How QR Codes Work and How to Make One
What a QR code actually stores, why it survives damage, and how to create one that scans reliably.
5 min
What Is a UUID and When Do You Need One?
Why applications need globally unique identifiers, how UUIDs achieve uniqueness without coordination, and when to use them.
4 min
How to Generate Truly Random Numbers (and Why Math.random Isn't Enough)
The difference between pseudo-random and cryptographic randomness, why it matters, and how to pick a fair number.
5 min
What Is a URL Slug and How to Create SEO-Friendly Ones
What the slug is, why readable URLs help users and search, and the rules for turning a title into a clean slug.
5 min
Barcodes Explained: How to Generate One That Scans
How the stripes encode numbers, the common barcode types, and how to make a barcode that scanners actually read.
5 min
Placeholder Images: Why Designers Use Them and How to Generate One
What placeholder images are for, why grey boxes beat real photos during design, and how to generate them at any size.
5 min
Why You Need Fake Data for Testing (and How to Generate It)
Why realistic test data beats "asdf," the privacy reasons never to test with real records, and what good fake data looks like.
5 min
How to Create a Signature for Documents Online
The difference between an electronic signature and a cryptographic one, when a drawn signature is enough, and how to make one privately.
5 min
How to Make a Professional Invoice (Free, No Software)
What every invoice must contain, why a unique number and clear terms matter, and how to create one that gets you paid.
4 min
CSS Gradients Explained: How to Create Beautiful Backgrounds
How linear and radial gradients work, why they are resolution-independent, and how to build ones that look good.
5 min
How to Calculate Percentages: Increase, Decrease and "Of"
The three percentage questions that cover almost everything, the mental-maths tricks, and the mistakes to avoid.
5 min
How Loan Repayments Work: Understanding Amortization
Why early payments are mostly interest, how the monthly figure is set, and what really drives the total cost of a loan.
5 min
What BMI Actually Measures (and What It Doesn't)
How the BMI number is calculated, what it is genuinely useful for, and the important limitations to keep in mind.
5 min
How Much to Tip: A Practical Guide to Splitting the Bill
How tipping percentages work, the mental shortcuts, and how to split a bill fairly including the tip.
5 min
How to Calculate Exact Age in Years, Months and Days
Why age is trickier than subtracting years, how leap years and month lengths complicate it, and how to get it exactly right.
4 min
How to Calculate the Number of Days Between Two Dates
Why counting days by hand goes wrong, how to handle inclusive versus exclusive counts, and where the calculation matters.
5 min
Scientific Calculator Functions Explained
What the trigonometric, logarithmic and power keys actually do, plus the order-of-operations rule that prevents wrong answers.
5 min
Compound Interest Explained: Why It's So Powerful Over Time
How earning interest on interest snowballs, why starting early beats saving more, and what really drives the final figure.
5 min
How to Calculate the Fuel Cost of a Trip
The simple formula behind trip fuel cost, why efficiency units confuse people, and how to split costs and compare journeys.
5 min
How Encryption Works: Keeping Text Truly Private
The difference between encoding and encryption, how a key protects your data, and why doing it locally matters most.
5 min
Generating Secure Keys and Secrets: What Makes a Key Strong
Why keys differ from passwords, what "enough entropy" really means, and how to generate and handle secrets safely.
5 min
How to Check What a Website Can Learn About You
The surprising amount your browser reveals automatically, how fingerprinting works, and practical steps to reduce your exposure.
5 min
Understanding Color on the Web: Hex, RGB and HSL
What the three color notations mean, why HSL is easiest to adjust, and how to choose colors with confidence.
5 min
How to Build a Color Palette That Actually Works
The color-wheel relationships behind good schemes, the 60-30-10 rule, and how to build a palette that feels intentional.
5 min
Color Contrast and Accessibility: Meeting WCAG
Why contrast matters for real people, what the WCAG ratios mean, and how to make sure your text is readable by everyone.
5 min
CSS Box Shadow Explained: Adding Depth and Elevation
What each box-shadow value does, how shadows create a sense of depth, and how to make them look natural.
5 min
CSS Border Radius: Rounded Corners Done Right
How border-radius works beyond simple rounding, why corner style shapes a brand's feel, and how to get consistent results.
5 min
How to Pair Fonts That Work Together
Why some font combinations click and others clash, the reliable pairing strategies, and how to keep typography simple.
5 min
CSS Grid Explained: Building Layouts the Modern Way
What makes Grid different from older layout methods, the core concepts, and how it makes responsive layouts simple.
5 min
Glassmorphism: The Frosted-Glass UI Effect Explained
What makes the frosted-glass look work, the CSS ingredients behind it, and how to use it without hurting usability.
5 min
How to Make Your Writing Easier to Read (Readability Scores Explained)
What readability scores measure, why shorter sentences and plainer words win, and how to write for your actual audience.
5 min
Meta Tags Explained: Title, Description and Open Graph
What the title and description tags control, why Open Graph shapes your social previews, and how to write them well.
5 min
Keyword Density: What It Is and Why Stuffing Backfires
What keyword density measures, why there is no magic percentage, and how to use keywords naturally instead of stuffing them.
5 min
How to Cite Sources: APA, MLA and Chicago Explained
Why citations matter, what the main styles have in common, and how to reference sources correctly and consistently.
5 min
How to Write Blog Titles That Get Clicks
Why the title does most of the work, the patterns that reliably earn clicks, and how to stay compelling without clickbait.
5 min
How Text Summarizers Work and When to Use One
The difference between extractive and abstractive summaries, what summarizers do well, and where human judgement is still essential.
5 min
The Pomodoro Technique: Why Working in 25-Minute Sprints Works
Why a simple timer beats willpower, how the intervals fight distraction and burnout, and how to adapt it to your work.
5 min
Why Writing a To-Do List Works (and How to Write a Better One)
The psychology behind why writing tasks down frees your mind, and the habits that turn a list into real progress.
5 min
The Case for a Quick Digital Notepad in Your Browser
Why a friction-free place to jot things down beats a full app, and how capturing thoughts fast makes you more productive.
5 min
How a Countdown Timer Sharpens Focus and Beats Procrastination
Why a visible deadline changes behaviour, the psychology of time pressure, and practical ways to put a countdown to work.
5 min
How Habit Tracking Builds Consistency (and Why the Streak Works)
The psychology that makes marking a habit each day so effective, and how to track habits in a way that actually sticks.
5 min
The Real Cost of Meetings (and How to Calculate It)
Why meetings cost far more than they seem, how to put a number on that cost, and how the number changes behaviour.
5 min
Is a Coin Flip Really 50/50? The Surprising Truth
Why real coin flips are not perfectly fair, how a digital flip fixes the bias, and why we use coins to decide at all.
5 min
Spin the Wheel: Making Random Choices Fun and Fair
Why a spinning wheel makes randomness feel fair and exciting, where it beats a plain draw, and how to use it well.
5 min
How Emoji Actually Work (and How to Use Them Well)
Why emoji look different across devices, how they are really just characters, and how to use them to add clarity and tone.
5 min
How to Test Regular Expressions Without Breaking Them
Why regex is powerful but easy to get wrong, how a live tester saves hours, and the building blocks worth knowing.
5 min
What Is a Hash? MD5, SHA-256 and How Hashing Works
What a hash function does, why it is one-way, the difference between MD5 and SHA-256, and what hashing is really for.
5 min
How Password Strength Is Actually Measured
Why the usual strength meters mislead, what entropy really measures, and what actually makes a password hard to crack.
5 min
How to Pick a Random Winner Fairly (Raffles, Giveaways and Names)
Why fair random selection is harder than it looks, what makes a draw trustworthy, and how to run one people believe in.
5 min
Why Password Rules Are So Frustrating (and What Good Ones Look Like)
Why absurd password requirements exist, how they can make security worse, and what genuinely good rules look like.