https://www.toolsnow.net/blog/ Practical guides on units, dates, files, percentages and the other everyday calculations behind the tools. en https://www.toolsnow.net/blog/business-days-vs-calendar-days/ https://www.toolsnow.net/blog/business-days-vs-calendar-days/ Ten business days can span more than two calendar weeks. How business-day counting works, where weekends differ worldwide, and the counting traps in contracts. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/exif-data-what-your-photos-reveal/ https://www.toolsnow.net/blog/exif-data-what-your-photos-reveal/ Photos carry hidden metadata — GPS location, device, timestamps — that survives most sharing. What EXIF contains, where it gets stripped, and how to remove it. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/base64-is-not-encryption/ https://www.toolsnow.net/blog/base64-is-not-encryption/ Encoding, encryption and hashing all turn data into gibberish — and solve completely different problems. What each guarantees, and where each is misused. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/compound-interest-the-mechanics/ https://www.toolsnow.net/blog/compound-interest-the-mechanics/ The compound interest formula, why compounding frequency matters less than people think, the rule of 72, and how the same mechanics work against you in fees. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/cron-syntax-explained/ https://www.toolsnow.net/blog/cron-syntax-explained/ Cron expressions like 0 3 * * 1 pack a schedule into five fields. How to read them, the day-of-month vs day-of-week trap, and the mistake that fires 60 times. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/how-loan-amortisation-actually-works/ https://www.toolsnow.net/blog/how-loan-amortisation-actually-works/ Equal monthly payments hide a shifting split between interest and principal. The mechanics of the amortisation formula, explained step by step with a worked example. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/how-to-read-a-jwt/ https://www.toolsnow.net/blog/how-to-read-a-jwt/ A JSON Web Token is three Base64 sections split by dots — readable by anyone, forgeable by no one. How the format works, the claims, and the classic pitfalls. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/jpeg-vs-png-when-to-use-which/ https://www.toolsnow.net/blog/jpeg-vs-png-when-to-use-which/ One format is built for photographs, the other for sharp edges and transparency. How each compresses, where each fails, and a rule of thumb that rarely misses. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/ounces-vs-fluid-ounces/ https://www.toolsnow.net/blog/ounces-vs-fluid-ounces/ An ounce measures weight, a fluid ounce measures volume, and they only coincide for water. Why "8 oz of chicken" and "8 oz of milk" are different kinds of quantity. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/mb-vs-mib-why-your-drive-looks-smaller/ https://www.toolsnow.net/blog/mb-vs-mib-why-your-drive-looks-smaller/ Drive makers count in powers of 1000, operating systems in powers of 1024. Nobody is lying — the maths behind the missing gigabytes, and what KiB and MiB mean. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/percent-vs-percentage-points/ https://www.toolsnow.net/blog/percent-vs-percentage-points/ An interest rate rising from 2% to 3% is one percentage point — but a 50% increase. Why the two phrasings differ, and the percentage traps hiding in everyday claims. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/pdf-password-types-explained/ https://www.toolsnow.net/blog/pdf-password-types-explained/ A PDF can have an open password, a permissions password, or both — and they offer very different protection. What each one does, and what removing them involves. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/us-uk-metric-cups-why-recipes-fail/ https://www.toolsnow.net/blog/us-uk-metric-cups-why-recipes-fail/ A US cup is 236.6 ml, a metric cup is 250 ml, and an old UK cup is 284 ml. Why the same recipe measures differently by country, and when the gap actually matters. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/week-numbers-explained/ https://www.toolsnow.net/blog/week-numbers-explained/ Europe plans by week numbers, but ISO 8601 and US conventions disagree about week 1 — and some years have 53 weeks. How the numbering systems actually work. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/what-checksums-are-for/ https://www.toolsnow.net/blog/what-checksums-are-for/ Sites publish SHA-256 hashes next to downloads for a reason. What a checksum proves, what it cannot prove, how to check one on any OS, and why MD5 still exists. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/scanned-pdf-vs-text-pdf/ https://www.toolsnow.net/blog/scanned-pdf-vs-text-pdf/ Some PDFs let you select and search text, others behave like photos. The difference is the text layer — what it is, how to check for it, and what OCR actually does. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/what-adding-a-month-actually-means/ https://www.toolsnow.net/blog/what-adding-a-month-actually-means/ What is 31 January plus one month? There is no single right answer — how month arithmetic works, why software clamps dates, and where the edge cases bite. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/why-timezone-conversion-is-hard/ https://www.toolsnow.net/blog/why-timezone-conversion-is-hard/ UTC offsets change with the calendar, half-hour zones exist, and DST switches on different dates worldwide. Why fixed-offset arithmetic is only usually right. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/why-compressing-a-pdf-can-make-it-bigger/ https://www.toolsnow.net/blog/why-compressing-a-pdf-can-make-it-bigger/ PDF compressors shrink scans dramatically but can inflate text documents. The difference is what the PDF stores inside — here is how to tell before you compress. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/what-dpi-actually-means/ https://www.toolsnow.net/blog/what-dpi-actually-means/ 72, 96, 150, 300 — DPI settings decide between blurry prints and bloated files. What the number controls, and which value fits screen, print and OCR. Sun, 26 Jul 2026 00:00:00 GMT https://www.toolsnow.net/blog/extra-mortgage-payments-math/ https://www.toolsnow.net/blog/extra-mortgage-payments-math/ Overpaying a loan saves far more than the amount you overpay. Here is why the effect is non-linear, and how to work out the saving for your own loan. Tue, 07 Oct 2025 00:00:00 GMT https://www.toolsnow.net/blog/cups-to-grams-why-it-depends-on-the-ingredient/ https://www.toolsnow.net/blog/cups-to-grams-why-it-depends-on-the-ingredient/ A cup is a volume, a gram is a weight, and the bridge between them is density. Here is what a cup of each common baking ingredient actually weighs. Tue, 16 Sep 2025 00:00:00 GMT https://www.toolsnow.net/blog/how-to-remove-vat-from-a-price/ https://www.toolsnow.net/blog/how-to-remove-vat-from-a-price/ Removing VAT is not the same as subtracting the VAT percentage. Here is the correct formula, why the intuitive method is wrong, and how much it costs you. Tue, 02 Sep 2025 00:00:00 GMT