Guides
Practical guides: differences between JPG, PNG, WebP, HEIC, MP3, FLAC and MP4, making a favicon, compressing images and converting measurement units.
Images
JPG vs PNG vs WebP: Which Image Format to Choose
How JPG, PNG and WebP differ in compression, transparency, file size and compatibility, with a comparison table and clear advice on when to use each.
How to Open HEIC Files on Windows, Android and Mac
What HEIC is, why iPhones use it, and how to open or convert it to JPG on Windows, Android and Mac, or for websites that refuse the format.
How to Make a Favicon: Sizes, Formats and HTML Code
What a favicon is, which sizes you need (16, 32, 48, 180, 192, 512 px), ICO vs PNG vs SVG, how to build one from a PNG and which link tags to use.
How to Compress Images for a Website and Speed Up Your Pages
Why image weight affects page speed and LCP, how to choose WebP or JPG, which quality to use, and how to apply srcset, lazy loading and dimensions.
Audio
Video
MP4 vs WebM vs MOV vs MKV: Video Formats Explained
How MP4, WebM, MOV and MKV differ, what containers and codecs are, how they work on iPhone, Android and browsers, and when converting to MP4 is worth it.
How to Extract Audio from a Video (MP4 to MP3, WAV, M4A)
How to pull the audio track out of an MP4, MOV or WebM file as MP3, WAV or M4A, which bitrate to choose, how quality changes and what file sizes to expect.
How to Shrink a Video for Email and Messengers
Why videos are so large and how to make them smaller: resolution, bitrate, MP4 with H.264 and a step-by-step approach using a browser converter.
Unit converters
Metric vs Imperial Units: A Practical Guide
Where miles, pounds and gallons are still used, how US and imperial gallons differ, and quick mental tricks for the most common conversions.
Celsius, Fahrenheit and Kelvin: Formulas and Examples
The three temperature scales, exact formulas, a quick mental trick and a table of reference temperatures for water, the body, rooms and ovens.
Speed, Power and Pressure: km/h, mph, kW, hp, bar and psi
How km/h, mph, knots and m/s relate, how kW compares with horsepower, and bar with psi and atm. Examples with tyres, cars and weather pressure.