Practical guides and tutorials from Toolew: data formats, images, PDFs, finance, design, privacy and productivity.https://toolew.com/enhttps://toolew.com/en/blog/why-toolew-runs-tools-in-your-browser/https://toolew.com/en/blog/why-toolew-runs-tools-in-your-browser/How Toolew processes files on your own device with JavaScript and WebAssembly, what that means for privacy and speed, and which tools use the network.Fri, 06 Nov 2026 00:00:00 GMTnewsprivacywebassemblyabout toolewofflinehttps://toolew.com/en/blog/regex-for-beginners/https://toolew.com/en/blog/regex-for-beginners/A practical introduction to regex: characters, classes, quantifiers, anchors, groups and flags, with real examples for validation, search and data cleanup.Wed, 04 Nov 2026 00:00:00 GMTdevelopersregexjavascripttext processingvalidationhttps://toolew.com/en/blog/colour-contrast-wcag-guide/https://toolew.com/en/blog/colour-contrast-wcag-guide/What contrast ratios mean, how WCAG 2.x calculates them, the AA and AAA thresholds, common pitfalls with brand colours, and how to build an accessible palette.Mon, 02 Nov 2026 00:00:00 GMTdesignaccessibilitywcagcolorui designhttps://toolew.com/en/blog/qr-codes-that-work/https://toolew.com/en/blog/qr-codes-that-work/How QR codes store data, how large to print them, which error-correction level to choose, how to add colours and logos safely, and how UPI payment QR codes are built.Fri, 30 Oct 2026 00:00:00 GMTguidesqr codesupiprintingmarketinghttps://toolew.com/en/blog/sip-vs-lump-sum-the-maths/https://toolew.com/en/blog/sip-vs-lump-sum-the-maths/How SIP and lump-sum returns are calculated, why the annuity-due formula matters, what rupee-cost averaging does and does not do, and how to compare fairly.Tue, 27 Oct 2026 00:00:00 GMTfinanceinvestingsipmutual fundscompound interesthttps://toolew.com/en/blog/merge-split-compress-pdf-privately/https://toolew.com/en/blog/merge-split-compress-pdf-privately/Step-by-step workflows for combining PDFs, extracting pages, reducing file size and signing documents, without uploading sensitive files anywhere.Sat, 24 Oct 2026 00:00:00 GMTtutorialspdfdocumentsprivacyproductivityhttps://toolew.com/en/blog/strong-passwords-passphrases-breach-checks/https://toolew.com/en/blog/strong-passwords-passphrases-breach-checks/What actually makes a password strong, why length beats complexity, how passphrases work, and how to check if a password has appeared in a data breach safely.Wed, 21 Oct 2026 00:00:00 GMTprivacypasswordssecurityprivacy2fahttps://toolew.com/en/blog/emi-explained-how-loan-instalments-work/https://toolew.com/en/blog/emi-explained-how-loan-instalments-work/Understand the EMI formula, why early payments are mostly interest, how tenure and rate change the total cost, and how prepayment saves money.Sun, 18 Oct 2026 00:00:00 GMTfinanceloansemihome loanpersonal financehttps://toolew.com/en/blog/compress-images-without-losing-quality/https://toolew.com/en/blog/compress-images-without-losing-quality/Choose the right format, size and quality setting for photos, screenshots and graphics, and shrink images for websites, forms and email in your browser.Thu, 15 Oct 2026 00:00:00 GMTguidesimagesweb performancecompressionwebphttps://toolew.com/en/blog/json-formatting-and-validation-guide/https://toolew.com/en/blog/json-formatting-and-validation-guide/Why JSON breaks, how to read parser errors, when to pretty-print or minify, and a repeatable workflow for cleaning API responses and config files.Mon, 12 Oct 2026 00:00:00 GMTdevelopersjsonapisdebuggingdata formats