https://gotool.app/ Long-form technical guides on the algorithms, standards and arithmetic behind Gotool's ten privacy-first, client-side web apps — image and audio compression, QR codes, unit conversion, text metrics, business and lending maths, VAT and invoicing. en © 2026 Gotool Wed, 23 Sep 2026 00:00:00 +0000 1440 https://dutqudfijwectvvwgdtn.supabase.co/storage/v1/object/public/Gotool%20Assets/og-image.png https://gotool.app/ 1200 630 https://gotool.app/articles/client-side-webp-compression.html https://gotool.app/articles/client-side-webp-compression.html How WebP's prediction, transform and entropy coding shave 25–35% off image weight — and why the whole compression pipeline runs safely inside your browser tab on img.gotool.app. Image Optimization Tue, 25 Aug 2026 00:00:00 +0000 https://gotool.app/articles/audio-compression-explained.html https://gotool.app/articles/audio-compression-explained.html Why a 40 MB WAV becomes a 4 MB MP3 that sounds nearly identical: perceptual coding, masking, MDCT, and how to pick a bitrate you won't regret — the engine behind audiocompress.gotool.app. Audio Engineering Tue, 22 Sep 2026 00:00:00 +0000 https://gotool.app/articles/qr-code-error-correction.html https://gotool.app/articles/qr-code-error-correction.html Reed–Solomon parity lets a QR symbol survive up to 30% damage and still scan instantly. The four ECC levels — and when each one earns its keep in qr.gotool.app. QR Codes Tue, 25 Aug 2026 00:00:00 +0000 https://gotool.app/articles/unit-conversion-precision.html https://gotool.app/articles/unit-conversion-precision.html From SI base units to IEEE 754 rounding artefacts — what correct conversion takes, and how unitconvert.gotool.app gets it right. Unit Conversion Tue, 25 Aug 2026 00:00:00 +0000 https://gotool.app/articles/word-counting-full-text-search.html https://gotool.app/articles/word-counting-full-text-search.html What exactly is a “word”? Tokenization, Unicode edge cases and reading-time maths for wordcount.gotool.app — plus the inverted indexes that power instant search in bible.gotool.app. Text & Search Tue, 22 Sep 2026 00:00:00 +0000 https://gotool.app/articles/profit-margin-markup-math.html https://gotool.app/articles/profit-margin-markup-math.html Margin versus markup — the confusion that quietly wrecks pricing. The exact formulas, the mental shortcuts and the traps, as computed in profitcalc.gotool.app. Business Finance Tue, 22 Sep 2026 00:00:00 +0000 https://gotool.app/articles/loan-amortization-explained.html https://gotool.app/articles/loan-amortization-explained.html Compound interest, the annuity formula and the table that shows where every payment goes. Read a schedule like a lender — with loancalc.gotool.app. Lending Maths Tue, 22 Sep 2026 00:00:00 +0000 https://gotool.app/articles/vat-invoicing-explained.html https://gotool.app/articles/vat-invoicing-explained.html Add or strip VAT without rounding drift, keep invoice totals internally consistent, and number documents like an accountant. Behind vat.gotool.app and invoicegen.gotool.app. Tax & Invoicing Tue, 22 Sep 2026 00:00:00 +0000 https://gotool.app/articles/client-side-privacy-first-software.html https://gotool.app/articles/client-side-privacy-first-software.html The safest database is the one that never receives your data. The engineering case behind all ten Gotool apps — and the honest limits of the approach. Privacy Engineering Tue, 25 Aug 2026 00:00:00 +0000