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Why PDF is still the format everyone asks for

PDF was designed to solve a simple problem: a document should look the same no matter who opens it. Fonts, page sizes, images and layout are fixed inside the file, so a CV, an invoice or a contract appears identically on a phone, a laptop and a printer. That reliability is why application portals, accounting departments and government offices still default to it.

The trade-off is that PDFs are hard to change. They store positioned text and graphics rather than flowing paragraphs, which is exactly what keeps the layout stable and exactly what makes editing awkward. Most everyday PDF work is therefore not about rewriting the content but about handling the file around it: combining documents, removing pages, shrinking a scan that is too big to email, adding a signature or turning the pages into another format when you genuinely need to edit them.

Browser processing versus server processing

Not every PDF task needs a server. Reordering pages, merging files, adding page numbers or placing a signature only rearranges and adds content, and modern browsers are fast enough to do that locally. For those tools, PDFTools never uploads your document: it is read and rebuilt on your own device, and the only copy that exists is the one you download.

Other jobs depend on specialised software that cannot run in a browser tab: recompressing images with Ghostscript, recognising text with Tesseract, rendering Word files with LibreOffice or rebuilding a damaged file structure. Those tools upload your file over an encrypted HTTPS connection, process it in an isolated worker and delete it automatically within an hour. Every tool page states clearly which of the two approaches it uses, so you can choose with full knowledge of where your file goes.

Getting good results from conversions and scans

Most disappointing conversions trace back to the source file. A scanned page is a photograph of text, so converting it straight to Word or Excel gives you pictures rather than editable words. Running OCR first adds a text layer, and scanning at around 300 DPI with the page flat and well lit makes recognition noticeably more reliable.

For conversions into PDF, fonts matter. If a document uses a typeface the converter does not have, a similar one is substituted and lines may wrap differently; embedding fonts or sticking to common ones avoids surprises. When converting out of PDF, expect simple documents to come through cleanly and elaborate designs to need some tidying up. Finally, remember the difference between hiding and removing: cropping or drawing a box over information only covers it, while redaction actually deletes it from the file.