How-to guides

Short how-to guides for converting audio, video, spreadsheets, pictures and units without mistakes. Each gives the answer first.

• How to extract audio from a videoSave the sound of any video as an MP3 in your browser, with no upload, no software to install and no watermark.
• HEIC vs JPG: which should you use?What HEIC is, how it differs from JPG, why iPhone photos will not open elsewhere, and how to convert them.
• How to open a CSV in Excel correctlyStop Excel dropping leading zeros, mangling long numbers and breaking accents when you open a CSV file.
• How to convert units without mistakesThe traps that cause wrong answers when you convert units: US and UK gallons, 1000 vs 1024, tonnes, temperature and Indian land units.