Blog

A spreadsheet export or email list turned into a mess? Five online tools for cleaning up text: duplicates, sorting, blank lines, numbering, find and replace.

What a WHOIS query shows, how to look up a domain's registrar and registration date online, and why the owner's name isn't always visible in the result.

What DNS record types exist (A, AAAA, MX, TXT, NS, SOA), what each is for, and how to quickly check them for any domain without opening a terminal.

Why compress code before publishing it on a site, what actually happens to HTML, CSS, and JS during minification, and how to turn compressed code back into something readable.

What CIDR notation means, how to calculate the network address, broadcast address, and host range from an IP/prefix, and what's special about /31 and /32 subnets.

How a SQL formatter adds indentation and line breaks to a query, which dialects it supports, and why that matters before a code review or a debugging session.

How XML and JSON differ, how attributes and repeated tags map onto JSON, and how to quickly convert data in both directions online.

What the five fields in a cron expression mean, how to read entries like */5 * * * * or 30 8 * * 1-5, and a free online cron expression decoder.

How to convert a number from decimal to binary and back: a clear step-by-step method with examples, a value table, and a free number base converter.

How many pounds are in one kilogram, the formula for converting kg to lbs and back, a table of common weight values, and a free mass converter.

What a HEX color code is, how the #RRGGBB format works, the formula for converting to RGB and back, a table of common colors, and a free color tool.

How to convert horsepower to kilowatts and back: the exact formula, a table of common engine power values, and a handy online power converter.

How to convert fuel consumption between liters per 100 km, kilometers per liter, and miles per gallon (MPG), with formulas, a table, and a free tool.

How Roman numerals work, the rules for writing them, a value table with examples for centuries and years, plus a free online converter tool.

What a slug is, why it matters for SEO, and how to turn any title into a clean, readable URL — the rules to follow, plus a free online generator tool.

What a JWT is, the three parts it’s made of, how to view its contents online for free, and why a token can be "decoded" but never forged by anyone.

A simple explanation of what Base64 is, why it exists, why it’s encoding rather than encryption, and how to encode or decode a string online.

Need to find the number of days between two dates — until an event, for a contract term, or to calculate age? Here are the methods and a handy date calculator.

How many centimeters are in an inch, the formula for converting cm to inches and back, a table of common sizes (screen diagonals, height), and a length converter.

A simple formula for converting Celsius to Fahrenheit and back, a handy table of common values, and a fast, accurate online temperature converter tool.

How many calories do you burn on a run? We break down what affects calorie burn while running, how much a 30-minute run burns, and how to calculate your own.

Need PDF pages as JPG images — for a presentation, sharing, or posting online? Here’s how to convert a PDF into images online, step by step.

Need to shrink an image down to a specific size in KB? Here’s how file size differs from resolution, and how to reduce a file online without losing quality.

Government portals and official forms often reject photos that are too large. Here’s how to shrink an image to a specific KB limit without losing quality.

How to correctly write a number and amount in words for a contract, invoice, or payment order: the rules, examples with cents, and how to do it automatically.

A simple explanation of what a UUID (GUID) is, how it’s structured, how versions differ, and where it’s used. Plus how to generate a UUID online in a second.

We explain the difference between PNG and JPG in plain terms: when each format works best, why PNG files are larger, and what to choose for photos, logos, screenshots.

How many calories does walking burn, and what does it depend on? We explain how calorie burn is calculated and compare walking with running and other activities.

What does body mass index show, how do you calculate it from height and weight, which values count as normal, and what are the limits of BMI as a health measure?

How many calories do you need per day? We explain in plain terms how the calorie norm is calculated (BMR and TDEE), how to set a deficit, and how to split macros.

How many grams are in a cup of flour? What about sugar? We explain why the weight depends on the ingredient and give a conversion table for cups, spoons, and milliliters.

A strong password protects your accounts from being hacked. We explain what makes a good password and how to generate one securely, right in your browser.

A QR code is a fast way to share a link, Wi-Fi password, or contact. Learn how to create a QR code online for free and download it for printing.

To make sure a document looks the same for everyone and doesn’t fall apart when opened, save it as PDF. Here’s how to convert Word (DOC, DOCX) to PDF online.

Need to edit text from a PDF? We explain how to convert PDF to Word (DOCX), what carries over well and what doesn’t, and why scans aren’t so easy to edit.

Need to send a photo or scan as a PDF document? Here’s how to convert JPG to PDF online and combine several images into one PDF in the right page order.

Windows won’t open your iPhone HEIC photos? Here are 4 fixes: convert to JPG online, install codecs from Microsoft Store, switch iPhone’s format, or use another app.

Is your PDF too big to upload or email? We explain why PDFs get so large and how to compress one without losing readability — online, no software needed.

Downloaded an image that won’t open because it’s WebP? Here’s what the format is, how to open it, and how to quickly convert WebP to JPG or PNG.

Need to pull music, a voiceover, or a podcast out of a video? Here’s how to extract the audio track from an MP4 and save it as MP3 online, no software needed.

Is Instagram cropping or compressing your photos in ways you don’t like? Here are the right dimensions and how to crop a photo to a clean 1080×1080 square online.

Need to combine a contract with its attachments, or several scanned pages, into a single document? Here’s how to merge PDFs online and set the right page order.