Guides
Practical answers to the questions that come up when converting files.
Answers, not marketing
Most conversion advice online exists to get you to click a button. These guides exist because the button sometimes does not help, and knowing why saves more time than trying another tool. They cover the questions that come up repeatedly: a PDF that refuses to shrink no matter what you do, the choice between three image formats that each claim to be best, and a photo format your own computer will not open.
Each guide is written to be useful whether or not you use our tools. Where a tool genuinely solves the problem, it is linked. Where it does not — and that happens, compression cannot rescue a scanned document — the guide says so and points at what actually works instead.
Why these three
They are the questions behind most conversion attempts that end in frustration. PDF size because the word "compress" implies a guarantee the format cannot always keep, and the reason is invisible until you know what to look for. Image formats because the choice is usually made by habit rather than by content, and the wrong habit either triples your page weight or covers your screenshots in artefacts. HEIC because millions of people meet it for the first time as an error message, with no indication of what the file even is.
All three share a theme worth stating once: file formats encode assumptions about their content. JPEG assumes a photograph, PNG assumes a graphic, HEIC assumes a modern decoder. Most conversion problems are really a mismatch between those assumptions and the file in front of you — which is why understanding the format beats trying another converter.
The tools these guides point to
Everything referenced here runs entirely in your browser. Files are read into memory, processed with JavaScript and handed straight back — nothing is uploaded, so there is no size cap beyond your device's memory and no queue to wait in.
For documents there are PDF tools covering splitting, merging, compression, rotation, page removal and conversion to Word or images. For pictures, the image converters handle JPG, PNG, WebP and HEIC along with compression and resizing. Beyond those sit a QR code generator, a unit converter, text utilities and colour tools including a WCAG contrast checker.
That local-processing design is also why these guides can be blunt about limitations. There is no upsell behind them: if compression will not shrink your scan, saying so costs us nothing and saves you an afternoon.