Guides
How document formats actually work, what converters can and cannot do, and how to handle sensitive files without handing them to anyone.
Is it safe to use online PDF converters?
Most online converters upload a copy of your document to a server you know nothing about. Here is what that means in practice, and how to tell which tools avoid it entirely.
What actually happens when you upload a file to a converter
A step-by-step account of where your document goes after you press the button, why "deleted after one hour" is harder than it sounds, and which claims you can verify yourself.
How to work with confidential documents safely online
A practical routine for handling contracts, payslips and client files with online tools — what to check before you start, what to strip before you share, and where the real leaks happen.
How to merge PDFs without uploading them anywhere
Combine several PDFs into one without sending them to a server — what changes in the merged file, what does not, and how to check the tool you are using really works locally.
How to convert PDF to Word without losing formatting
Why PDF to Word is never a perfect reproduction, which parts of a document reliably survive, and how to get the cleanest possible result from the conversion.
How to extract text from a PDF
Getting clean, usable text out of a PDF — why copy and paste produces a mess, why columns come out interleaved, and what to do when there is no text in the file at all.
How to compress a PDF without making the text blurry
Blurry text after compression means the whole page was turned into an image. Here is what is actually making your PDF large, and how to shrink it while keeping text sharp.
How to convert Word to PDF and keep your fonts
Why a converted document reflows or changes typeface, how font embedding actually works, and what to do when the PDF does not match what you saw in Word.
How to split a PDF by chapter
Breaking a long PDF into sections — how to find the right page boundaries quickly, and when splitting is the wrong tool for what you actually want.
How to fix a sideways or upside-down scanned PDF
Rotating pages so the fix sticks in every reader and when printed — including why some documents look right on screen and come out wrong on paper.
How to password-protect a PDF (and what that actually protects)
The difference between the two PDF passwords, what permissions really enforce, and an honest account of what encryption does and does not protect you from.
How to open DOCX, XLSX and PPTX without Microsoft Office
You have been sent a Word, Excel or PowerPoint file and do not have Office. What your options are, what each one costs you, and which parts of a document survive in each.
Why your PowerPoint is too big to email — and how to fix it
A deck of twenty slides should not be 80 MB. Find out exactly which images are responsible, and shrink the file without touching the design.
Why your Excel dates break when you export to CSV
Dates turn into numbers, days and months swap places, and leading zeros vanish. Here is what a spreadsheet actually stores in a date cell, and how to export so the other side reads it correctly.
How to remove metadata from a document before sharing it
Documents carry author names, company details, edit history and cropped-away image data. Here is what is hidden in a file, how to see it, and how to remove it before you send.
How to write a résumé an ATS can actually read
What an applicant tracking system extracts from a CV, why columns and text boxes disappear, and a two-minute test that shows you exactly what the machine sees.
How to make an invoice without signing up for anything
What an invoice has to contain, why most free invoice generators ask for an account, and how to produce a numbered PDF invoice without handing over your client list.
How to compare two Word documents and see what changed
How document comparison works, why it disagrees with tracked changes, the edits a diff cannot see, and how to compare two contract drafts without sending either to a server.
How to clean up a messy spreadsheet
The order to do it in, why trailing spaces defeat duplicate detection, how a single text cell poisons a numeric column, and how to clean a spreadsheet without uploading the data in it.
How to convert images between PNG, JPG and WebP
Which image format to use and when, why converting a JPG twice makes it worse, what happens to transparency, and how to convert without uploading the picture anywhere.
How to watermark a PDF (and what it actually stops)
How text and image watermarks are stored in a PDF, why some can be deleted in seconds, and an honest account of what a watermark deters rather than prevents.
How to convert Markdown to Word, PDF or HTML
What survives the conversion from Markdown and what does not, why tables and code blocks are the two things to check, and how to produce a .docx for someone who does not want a text file.
How to find duplicate files without a cloud scanner
Why matching on name and size is not enough, how a file hash proves two files are identical, which copy to keep, and how to check a folder without a program that indexes your disk.