Wid9et Blog
Simple, useful guides that explain everyday calculations, files, online tools, gaming and more - without unnecessary jargon.
What Is Compound Interest and How Does It Work?
Learn what compound interest means, how it grows money over time, how compounding frequency matters and how to calculate it with a simple example.
How to Calculate Compound Interest
A step-by-step guide to calculating compound interest, including the formula, annual and monthly compounding examples and the effect of regular contributions.
Simple Interest vs Compound Interest: What's the Difference?
Understand the difference between simple and compound interest with clear examples, formulas and an explanation of when the difference matters most.
How to Calculate Loan Repayments
Learn what determines a loan repayment, how interest and loan term affect monthly payments and how to estimate the total cost of borrowing.
How Do Mortgage Repayments Work?
A simple guide to mortgage repayments, including capital, interest, repayment terms, rates and why monthly payments can change.
What Is Profit Margin and How Do You Calculate It?
Learn what profit margin means, how to calculate gross profit margin from selling price and cost, and why margin is different from markup.
What Is the Break-Even Point? A Simple Guide
Understand the break-even point, fixed and variable costs, contribution per sale and how to calculate how many units a business must sell to cover its costs.
How to Calculate VAT: Add or Remove VAT Easily
Learn how to add VAT to a net price, remove VAT from a VAT-inclusive price and avoid the common mistake of subtracting the VAT rate directly.
How to Calculate Fuel Cost for a Journey
Work out the estimated fuel cost of a trip from distance, fuel economy and fuel price, with examples for MPG and litres per 100 km.
Percentage Calculations Explained Simply
Learn how to find a percentage of a number, work out percentage increase or decrease and calculate what percentage one number is of another.
How to Calculate Your Exact Age
Learn how exact age is calculated in years, months and days, why simply dividing days by 365 is inaccurate and how birthdays and leap years affect the result.
How to Calculate the Difference Between Two Dates
Find out how date differences work, including elapsed days, inclusive counting, leap years and why calendar calculations can be surprisingly easy to get wrong.
How Unit Conversion Works: A Simple Guide
Understand unit conversion using conversion factors, with simple examples for length, weight, temperature and common metric and imperial units.
What Is BMI and What Does Your BMI Number Mean?
Learn what BMI stands for, how Body Mass Index is calculated, what BMI ranges mean and the important limitations of using BMI as a health measure.
BMR vs TDEE: What Do They Mean?
Learn what BMR and TDEE stand for, the difference between Basal Metabolic Rate and Total Daily Energy Expenditure and how calorie estimates are calculated.
What Is a Calorie Deficit and How Does It Work?
Understand what a calorie deficit means, how it relates to TDEE and weight change, why estimates vary and why bigger is not automatically better.
How to Calculate Running Pace and Finish Time
Learn how running pace works, how to calculate minutes per mile or kilometre and how to estimate race finish times from pace.
How Much Water Should You Drink a Day?
A practical guide to daily hydration, why water needs vary, what counts towards fluid intake and why there is no single perfect amount for everyone.
Sleep Cycles Explained: When Should You Go to Bed?
Learn what happens during a sleep cycle, why cycles are not exactly 90 minutes and how a bedtime calculator can be used as a rough planning tool.
How Is a Pregnancy Due Date Calculated?
Learn how estimated pregnancy due dates are calculated from the last menstrual period or conception, why 40 weeks is an estimate and how ultrasound dating can differ.
How to Compress a PDF and Reduce File Size
Learn why PDF files become large, what PDF compression actually changes and how to reduce file size without making text or images unnecessarily poor quality.
How to Merge PDF Files Into One Document
Learn how to combine several PDFs into one file, put documents in the right order and avoid common problems with duplicate or unwanted pages.
How to Split a PDF Into Separate Pages or Sections
Learn how PDF splitting works, when to extract selected pages and how to turn one large PDF into smaller documents without recreating the content.
How to Reorder Pages in a PDF
Learn how to rearrange PDF pages, fix scanned documents in the wrong order and check page numbering after moving pages.
How to Add Page Numbers to a PDF
Learn how to add page numbers to a PDF, choose a position and starting number and handle cover pages or documents whose printed numbering starts later.
How to Add a Watermark to a PDF
Learn what PDF watermarks are, how to choose watermark text, opacity, size and position, and how to keep the document readable.
How to Convert a PDF to Images - or Images to PDF
Understand the difference between converting PDF pages to images and combining images into a PDF, including format, quality and page-order considerations.
Useful Free PDF Tools You Can Use in Your Browser
A practical guide to common PDF jobs including compressing, merging, splitting, reordering, numbering, watermarking and converting PDFs in your browser.
How to Compress an Image Without Making It Look Bad
Learn how image compression reduces file size, the difference between lossy and lossless compression and how to balance quality with smaller files.
How to Resize an Image Without Distorting It
Learn how image resizing works, what aspect ratio means and how to change width or height without stretching faces, logos or other content.
JPG, PNG and WebP: Which Image Format Should You Use?
Compare JPG, PNG and WebP in plain English, including compression, transparency, image quality and which format suits photos, graphics and websites.
How to Crop an Image to the Right Size
Learn how image cropping changes composition, how aspect ratios work and how to crop photos for square, portrait, landscape and social-media layouts.
How to Add a Watermark to an Image
Learn how to watermark an image, choose text, position, size and opacity, and keep a watermark visible without ruining the picture.
What Is a Base64 Image and When Is It Useful?
Learn what Base64 image encoding is, why an image can be represented as text, what a data URL looks like, when Base64 is useful and why it increases data size.
What Is JSON Formatting and Why Does It Matter?
Learn what JSON is, how objects, arrays, keys and values work, what pretty-printing and minifying mean and how formatting helps spot invalid JSON.
CSV vs JSON: What's the Difference?
Compare CSV and JSON with simple examples, including how each format stores data and when tables, spreadsheets, APIs or nested data suit one format better.
What Is a Hash? A Simple Guide to Hashing
Learn what hashing does, why the same input produces the same digest, how hashes help verify data and why hashing is not the same as encryption.
What Is a UUID and Why Is It Used?
Learn what UUID stands for, what a UUID looks like, why developers use them as identifiers and how UUIDs differ from simple sequential IDs.
What Is a UTM Link and How Do UTM Parameters Work?
Learn what UTM parameters are, what utm_source, utm_medium and utm_campaign mean and how tagged links help measure marketing traffic.
How to Convert Markdown to HTML
Learn how common Markdown syntax maps to HTML headings, paragraphs, links and lists, and when converting Markdown to HTML is useful.
How to Count Words and Characters in Text
Learn what word and character counts include, why spaces and punctuation matter and how counts are used for essays, forms, bios and online content.
Uppercase, Lowercase and Title Case Explained
Understand uppercase, lowercase, title case and sentence case, when each style is used and how to convert text without retyping it.
How to Remove Duplicate Lines From Text
Learn what duplicate-line removal does, how exact duplicates differ from near-duplicates and how to clean repeated entries while preserving useful data.
How to Format WhatsApp Text: Bold, Italic and More
Learn how WhatsApp text formatting works for bold, italic, strikethrough, monospace, quotes and lists, with simple examples you can copy.
How to Create a WhatsApp Link Without Saving a Number
Learn how WhatsApp click-to-chat links work, how to include a phone number and pre-filled message and why the international number format matters.
How to Add Clean Line Breaks to Instagram Captions
Learn how line breaks improve Instagram captions, why pasted spacing can behave unexpectedly and how to prepare readable paragraphs and lists.
What Games Can You Play on Wid9et?
Explore Wid9et browser games, from Snake and Minesweeper to reaction challenges, arcade games, puzzles and quick skill games you can play without installing anything.
Quick Browser Games to Play When You Have Five Minutes
Looking for a five-minute game break? Compare quick Wid9et games for reactions, arcade action, puzzles and high-score attempts, with suggestions based on how much time you have.
Minecraft Nether Coordinates Explained Simply
Learn the Minecraft Nether 8:1 coordinate relationship, how to convert X and Z coordinates and how Nether travel can shorten long Overworld journeys.
Minecraft Stacks Explained: How Many Stacks Do You Need?
Learn how Minecraft item stacks work, how to convert item totals into stacks and leftovers and why some items use stack sizes other than 64.
Useful Online Generators: What Can You Create in Your Browser?
Explore useful browser generators for QR codes, passwords, names, favicons, usernames, random numbers, hashtags, UUIDs and WhatsApp links.
Random Tools for Quick Decisions, Picks and Challenges
Explore simple random tools including coin flips, wheel spins, random numbers, names, dice and gaming challenge pickers.