Practical, privacy-first guides for everyday file tasks: merge and compress PDFs, convert iPhone HEIC photos, and more.https://notatall.me/enhttps://notatall.me/blog/business-ratios-margin-roas-break-even/https://notatall.me/blog/business-ratios-margin-roas-break-even/Compare three business ratios with worked arithmetic: 20% margin, 3× ROAS and 100 break-even units, including zero-denominator limits.Sat, 05 Sep 2026 00:00:00 GMThttps://notatall.me/blog/unit-conversion-definitions-and-precision/https://notatall.me/blog/unit-conversion-definitions-and-precision/Convert inches and pounds using their definitions, distinguish US gallons and binary data units, and keep rounding separate from measurement accuracy.Sat, 05 Sep 2026 00:00:00 GMThttps://notatall.me/blog/create-qr-code-that-still-scans/https://notatall.me/blog/create-qr-code-that-still-scans/Create a reliable QR code for a URL, WiFi network, email or text. Learn how size, contrast, quiet space and testing affect scan success.Thu, 03 Sep 2026 00:00:00 GMThttps://notatall.me/blog/how-to-rotate-scanned-pdf-pages/https://notatall.me/blog/how-to-rotate-scanned-pdf-pages/Fix sideways or upside-down scanned PDF pages without re-exporting them as images. Rotate every page or only the pages that need correction.Thu, 03 Sep 2026 00:00:00 GMThttps://notatall.me/blog/how-to-turn-jpg-into-pdf/https://notatall.me/blog/how-to-turn-jpg-into-pdf/Convert JPG, PNG or WebP images into a clean PDF, choose A4 or Letter pages, preserve order and set margins without uploading your files.Thu, 03 Sep 2026 00:00:00 GMThttps://notatall.me/blog/jpg-png-webp-which-image-format/https://notatall.me/blog/jpg-png-webp-which-image-format/Compare JPG, PNG and WebP for photos, transparency and websites. Learn the trade-offs, then convert images privately in your browser.Thu, 03 Sep 2026 00:00:00 GMThttps://notatall.me/blog/jwt-decoder-explained/https://notatall.me/blog/jwt-decoder-explained/Learn what the three parts of a JSON Web Token contain, how to inspect exp and other claims, and why decoding a JWT is not verification.Thu, 03 Sep 2026 00:00:00 GMThttps://notatall.me/blog/pdf-to-jpg-or-png-which-format/https://notatall.me/blog/pdf-to-jpg-or-png-which-format/Choose JPG or PNG when converting PDF pages to images. Compare file size, text sharpness, editing needs and print quality before downloading.Thu, 03 Sep 2026 00:00:00 GMThttps://notatall.me/blog/convert-csv-to-json-without-breaking-commas/https://notatall.me/blog/convert-csv-to-json-without-breaking-commas/Convert CSV rows into JSON objects safely, including quoted commas, line breaks, headers and alternate delimiters. Learn what happens to data types.Thu, 03 Sep 2026 00:00:00 GMThttps://notatall.me/blog/format-json-find-syntax-errors/https://notatall.me/blog/format-json-find-syntax-errors/Beautify or minify JSON and locate common syntax errors such as trailing commas, missing quotes and unmatched braces with a browser-based validator.Thu, 03 Sep 2026 00:00:00 GMThttps://notatall.me/blog/resize-images-without-losing-quality/https://notatall.me/blog/resize-images-without-losing-quality/Resize images by pixels or percentage without stretching them. Learn how to choose dimensions, preserve aspect ratio and avoid avoidable quality loss.Thu, 03 Sep 2026 00:00:00 GMThttps://notatall.me/blog/uuid-v4-explained-when-to-use-random-ids/https://notatall.me/blog/uuid-v4-explained-when-to-use-random-ids/Understand UUID v4 randomness, collisions, database trade-offs and public identifiers. Generate browser-based UUIDs without exposing your data.Thu, 03 Sep 2026 00:00:00 GMThttps://notatall.me/blog/avif-images-wont-open-how-to-convert/https://notatall.me/blog/avif-images-wont-open-how-to-convert/Why AVIF fails to open and how to convert it to JPG or PNG for free in your browser — plus when to keep the original.Sun, 30 Aug 2026 00:00:00 GMThttps://notatall.me/blog/compress-pdf-for-email-attachment-limits/https://notatall.me/blog/compress-pdf-for-email-attachment-limits/Compare PDF compression modes with measured sample results, check email attachment limits, and keep readable text, page sizes and your original document.Sun, 30 Aug 2026 00:00:00 GMThttps://notatall.me/blog/heic-to-jpg-why-iphone-photos-wont-open/https://notatall.me/blog/heic-to-jpg-why-iphone-photos-wont-open/iPhone photos save as HEIC, which Windows, older apps and many websites cannot open. Here is why the format exists and three reliable ways to convert HEIC to JPG.Sun, 30 Aug 2026 00:00:00 GMThttps://notatall.me/blog/free-invoice-template-freelancers-pdf/https://notatall.me/blog/free-invoice-template-freelancers-pdf/What a professional freelance invoice must contain, the mistakes that delay payment, and a free browser tool that generates a clean PDF invoice with no signup.Sun, 30 Aug 2026 00:00:00 GMThttps://notatall.me/blog/how-long-should-my-speech-be-words-to-minutes/https://notatall.me/blog/how-long-should-my-speech-be-words-to-minutes/How to convert word count into speech length: the 130 words-per-minute rule, real pacing benchmarks by genre, and a calculator that does the math for any text.Sun, 30 Aug 2026 00:00:00 GMThttps://notatall.me/blog/how-many-tokens-gpt-prompt-token-counting-explained/https://notatall.me/blog/how-many-tokens-gpt-prompt-token-counting-explained/What tokens are, why 500 characters is not 500 tokens, how to count tokens for GPT-5/GPT-4o and Claude exactly or by estimate, and why it changes your API bill.Sun, 30 Aug 2026 00:00:00 GMThttps://notatall.me/blog/how-to-calculate-gpa-high-school-college/https://notatall.me/blog/how-to-calculate-gpa-high-school-college/A clear walkthrough of GPA math: the 4.0 scale, credit weighting, semester vs cumulative GPA, and how percentage grades convert — plus a calculator that does it live.Sun, 30 Aug 2026 00:00:00 GMThttps://notatall.me/blog/how-to-merge-pdf-files-online/https://notatall.me/blog/how-to-merge-pdf-files-online/Merge PDFs locally, check the page order and understand what happens to text, forms and signatures. Includes a tested two-file example and scan troubleshooting.Sun, 30 Aug 2026 00:00:00 GMThttps://notatall.me/blog/photo-metadata-privacy-check-gps-before-sharing/https://notatall.me/blog/photo-metadata-privacy-check-gps-before-sharing/Every photo you post can carry hidden EXIF metadata: GPS coordinates, your device, and timestamps. Here is what is inside your photos and how to strip it safely.Sun, 30 Aug 2026 00:00:00 GMThttps://notatall.me/blog/remove-background-from-photo-without-photoshop/https://notatall.me/blog/remove-background-from-photo-without-photoshop/Three free ways to cut the subject out of a photo — an in-browser AI tool, PowerPoint, and a phone app — and when each one is the right choice.Sun, 30 Aug 2026 00:00:00 GMT