https://tooljip.com/en/blog/ Practical, plain-English guides to PDFs, images, text and data formats, everyday math, and time management. Each article answers one question clearly. en Tue, 06 Oct 2026 00:00:00 GMT https://tooljip.com/en/blog/coin-flip-probability/ https://tooljip.com/en/blog/coin-flip-probability/ Tue, 06 Oct 2026 00:00:00 GMT Randomness & Probability Coin flip probability for sequences, at least one head, and k heads in n flips, plus why streaks happen and how to get a fair result from a biased coin. https://tooljip.com/en/blog/compress-images-for-web/ https://tooljip.com/en/blog/compress-images-for-web/ Tue, 06 Oct 2026 00:00:00 GMT Image Guides Learn the right order to compress images for the web: resize for real display size, pick a format, tune quality, strip metadata, and check results by eye. https://tooljip.com/en/blog/how-random-number-generators-work/ https://tooljip.com/en/blog/how-random-number-generators-work/ Tue, 06 Oct 2026 00:00:00 GMT Randomness & Probability Learn how random number generators work, from seeds and LCGs to secure and hardware randomness, and how to pick numbers in a range without modulo bias. https://tooljip.com/en/blog/how-to-calculate-percentage/ https://tooljip.com/en/blog/how-to-calculate-percentage/ Tue, 06 Oct 2026 00:00:00 GMT Everyday Math Calculate a percentage of a number, percent change, and original prices before discounts or tax, with worked examples and mental-math shortcuts. https://tooljip.com/en/blog/jpg-vs-png-vs-webp/ https://tooljip.com/en/blog/jpg-vs-png-vs-webp/ Tue, 06 Oct 2026 00:00:00 GMT Image Guides Compare JPG, PNG, and WebP: lossy vs. lossless compression, transparency, animation, and support, plus a use-case table and tips for safe conversion. https://tooljip.com/en/blog/merge-pdf-files/ https://tooljip.com/en/blog/merge-pdf-files/ Tue, 06 Oct 2026 00:00:00 GMT PDF Guides Learn how to merge PDF files with desktop apps, browser tools, or qpdf, plan page order, and avoid problems with bookmarks, forms, and signatures. https://tooljip.com/en/blog/percent-change-vs-percentage-points/ https://tooljip.com/en/blog/percent-change-vs-percentage-points/ Tue, 06 Oct 2026 00:00:00 GMT Everyday Math Learn the difference between percentage points and percent change, with examples, basis points, compounding, and why a 50% loss needs a 100% gain. https://tooljip.com/en/blog/pomodoro-technique-guide/ https://tooljip.com/en/blog/pomodoro-technique-guide/ Tue, 06 Oct 2026 00:00:00 GMT Time & Productivity Learn the Pomodoro Technique: the 25/5 cycle, why short timed blocks help, how to handle interruptions, and variants like 50/10, plus a sample day. https://tooljip.com/en/blog/reduce-pdf-file-size/ https://tooljip.com/en/blog/reduce-pdf-file-size/ Tue, 06 Oct 2026 00:00:00 GMT PDF Guides Learn what makes PDFs large and how to reduce PDF file size with image downsampling, JPEG recompression, and cleanup, without blurry text or broken links. https://tooljip.com/en/blog/to-do-list-methods/ https://tooljip.com/en/blog/to-do-list-methods/ Tue, 06 Oct 2026 00:00:00 GMT Time & Productivity See one task list organized four ways (Eisenhower Matrix, 1-3-5, Ivy Lee, and GTD), then pick the right method and fix the reasons to-do lists fail. https://tooljip.com/en/blog/unix-timestamp-explained/ https://tooljip.com/en/blog/unix-timestamp-explained/ Tue, 06 Oct 2026 00:00:00 GMT Text & Data Learn what a Unix timestamp is, how to tell seconds from milliseconds, convert epoch time to dates by hand or in code, and why 2038 matters. https://tooljip.com/en/blog/what-is-base64/ https://tooljip.com/en/blog/what-is-base64/ Tue, 06 Oct 2026 00:00:00 GMT Text & Data Learn what Base64 is, how it turns bytes into text step by step, why output grows by about 33%, what = padding means, and when to use it.