https://theusefulhacks.com/blog Practical guides behind the tools — how the math and formats actually work. en https://theusefulhacks.com/blog/how-to-convert-images-to-pdf https://theusefulhacks.com/blog/how-to-convert-images-to-pdf Sat, 29 Aug 2026 00:00:00 GMT Turn one or several JPG or PNG images into a single PDF, in the right page order — what the tool does, the steps, and the common snags. https://theusefulhacks.com/blog/how-to-merge-pdf-files https://theusefulhacks.com/blog/how-to-merge-pdf-files Sat, 29 Aug 2026 00:00:00 GMT Combine two or more PDFs into a single file, in the order you choose — the steps, what merging does to quality and size, and how to handle pages and images. https://theusefulhacks.com/blog/compress-pdf-to-1mb https://theusefulhacks.com/blog/compress-pdf-to-1mb Sat, 29 Aug 2026 00:00:00 GMT A 1 MB upload limit is common on application portals. Here's what's realistic, how to get there, and when 1 MB simply isn't possible without losing the text. https://theusefulhacks.com/blog/compress-pdf-for-email https://theusefulhacks.com/blog/compress-pdf-for-email Sat, 29 Aug 2026 00:00:00 GMT Gmail, Outlook and most providers cap attachments around 20–25 MB. Here's how to get a PDF under the limit — or send it without shrinking it at all. https://theusefulhacks.com/blog/compress-pdf-to-100kb https://theusefulhacks.com/blog/compress-pdf-to-100kb Sat, 29 Aug 2026 00:00:00 GMT 100 KB is a hard target that only works for some PDFs. Here's when it's realistic, how to get there, and what you lose along the way. https://theusefulhacks.com/blog/reduce-pdf-size-without-losing-quality https://theusefulhacks.com/blog/reduce-pdf-size-without-losing-quality Sat, 29 Aug 2026 00:00:00 GMT "Without losing quality" means different things for scans and for text PDFs. Here's what's actually possible and how to get the smallest safe result. https://theusefulhacks.com/blog/why-is-my-pdf-so-big https://theusefulhacks.com/blog/why-is-my-pdf-so-big Sat, 29 Aug 2026 00:00:00 GMT PDFs balloon for a small number of reasons — scanned pages, embedded photos, fonts. Here's how to tell which one is yours and fix it. https://theusefulhacks.com/blog/how-to-convert-pdf-to-jpg https://theusefulhacks.com/blog/how-to-convert-pdf-to-jpg Sat, 29 Aug 2026 00:00:00 GMT Turn PDF pages into JPG images — one page or all of them — and how to choose between JPG and PNG for the result. https://theusefulhacks.com/blog/how-to-convert-pdf-to-png https://theusefulhacks.com/blog/how-to-convert-pdf-to-png Sat, 29 Aug 2026 00:00:00 GMT Export PDF pages as lossless PNG images — best for text, diagrams and screenshots — and when to use JPG instead. https://theusefulhacks.com/blog/how-to-split-a-pdf https://theusefulhacks.com/blog/how-to-split-a-pdf Sat, 29 Aug 2026 00:00:00 GMT Split a PDF by page range, pull out a section, or break it into one file per page — the steps and the common cases. https://theusefulhacks.com/blog/how-to-make-a-pdf https://theusefulhacks.com/blog/how-to-make-a-pdf Sat, 29 Aug 2026 00:00:00 GMT The quickest route from images, documents or web pages to a PDF — and which conversions genuinely need desktop software. https://theusefulhacks.com/blog/pdf-size-limit-for-online-forms https://theusefulhacks.com/blog/pdf-size-limit-for-online-forms Sat, 29 Aug 2026 00:00:00 GMT Government, bank and exam portals cap uploads at 1 MB, 500 KB or less. Here's how to read the requirement and hit it without ruining the document. https://theusefulhacks.com/blog/combine-scanned-pages-into-one-pdf https://theusefulhacks.com/blog/combine-scanned-pages-into-one-pdf Sat, 29 Aug 2026 00:00:00 GMT You scanned a document and ended up with separate image or PDF files per page. Here's how to merge them into a single, correctly-ordered PDF. https://theusefulhacks.com/blog/jpg-to-pdf-on-phone https://theusefulhacks.com/blog/jpg-to-pdf-on-phone Sat, 29 Aug 2026 00:00:00 GMT Turn photos into a PDF straight from an Android phone or iPhone — in the browser, with no app to install. https://theusefulhacks.com/blog/combine-pdf-and-images https://theusefulhacks.com/blog/combine-pdf-and-images Sat, 29 Aug 2026 00:00:00 GMT You have a PDF plus a few JPGs or PNGs and need them as a single document. Here's the two-step way to do it in the browser. https://theusefulhacks.com/blog/resize-photo-and-signature-for-forms https://theusefulhacks.com/blog/resize-photo-and-signature-for-forms Sat, 29 Aug 2026 00:00:00 GMT Application portals want the photo and signature at exact pixel sizes and tiny file sizes. Here's how to hit both without an app. https://theusefulhacks.com/blog/ilovepdf-free-limits-and-alternatives https://theusefulhacks.com/blog/ilovepdf-free-limits-and-alternatives Sat, 29 Aug 2026 00:00:00 GMT What the iLovePDF free tier actually restricts, and where a no-signup browser-based toolkit does the same job without the caps. https://theusefulhacks.com/blog/smallpdf-free-limits-explained https://theusefulhacks.com/blog/smallpdf-free-limits-explained Sat, 29 Aug 2026 00:00:00 GMT The Smallpdf free tier's task-per-hour cap and watermark, what triggers them, and a no-limit browser alternative for the basics. https://theusefulhacks.com/blog/best-free-pdf-tools-no-signup https://theusefulhacks.com/blog/best-free-pdf-tools-no-signup Sat, 29 Aug 2026 00:00:00 GMT What "free, no signup" actually means across the popular PDF sites, and how to pick one for a quick one-off task. https://theusefulhacks.com/blog/sip-vs-lumpsum https://theusefulhacks.com/blog/sip-vs-lumpsum Sun, 25 Jan 2026 00:00:00 GMT Systematic investing and lump-sum investing solve different problems. Here's how to reason about which one fits your situation. https://theusefulhacks.com/blog/how-to-compress-pdf https://theusefulhacks.com/blog/how-to-compress-pdf Tue, 20 Jan 2026 00:00:00 GMT What actually makes PDFs large, why some compressors do more damage than others, and how to pick the right approach for your file. https://theusefulhacks.com/blog/how-to-calculate-emi https://theusefulhacks.com/blog/how-to-calculate-emi Thu, 15 Jan 2026 00:00:00 GMT A plain-English walkthrough of the EMI formula, what each variable means, and a worked example you can check by hand. https://theusefulhacks.com/blog/how-to-format-json https://theusefulhacks.com/blog/how-to-format-json Sat, 10 Jan 2026 00:00:00 GMT JSON looks like a JavaScript object but follows stricter rules. Here's what those rules are and how to read the errors when they're broken.