The Docs tower · floor plan

PDF tools: jpg to pdf, pdf to word, merge and sign

The four jobs people search for are jpg to pdf, pdf to word, pdf to jpg and word to pdf — more than twenty million searches a month in English alone, and merge pdf right behind them. This page is the map of that floor: what each job really does to your file, what your own computer already does for free, and where the paid tools start to earn their money.

What people actually ask for

We did not pick these four jobs because they are interesting. We measured them.

Two things stand out. First, the volume is not where you would expect: jpg to pdf is searched 6.120.000 times a month in India alone, against 301.000 in the United States. Second, every one of these is a task, not a question. People are not looking for an article about PDF software — they are looking for a box to drop a file into. That changes what a page like this should be: not a sales pitch, but a map that tells you when you do not need a tool at all.

Floor one · Convert

Converting is the whole tower, and it is really two different operations wearing the same word.

Into PDF: nothing is lost

Going into PDF — a photo, a Word file, a spreadsheet — is safe. The PDF is a container that freezes the layout: fonts, margins and page breaks stop moving. That is the point of the format, and it is why every institution asks for it.

You almost certainly do not need a website for this. Every desktop operating system has a PDF printer built in. On Windows, the Print dialog offers Microsoft Print to PDF. On macOS, the Print dialog has a PDF ▸ Save as PDF menu at the bottom left. Word, Excel, PowerPoint, Pages, LibreOffice and Google Docs all export to PDF directly, from File ▸ Export or File ▸ Download. On a phone, both iOS and Android can print a photo or a page to PDF from the standard share sheet.

An online converter earns its place when the file is somewhere your computer is not — a borrowed machine, a locked-down office laptop — or when you have forty images to turn into one document and you would rather drag them all at once.

Out of PDF: something always breaks

Coming out of PDF is the hard direction, and it is where expectations get hurt. A PDF does not store a document the way Word does. It stores instructions for painting a page: put this glyph here, draw this line there. Converting back to Word means guessing where the paragraphs, tables and columns used to be. Simple text comes back well. A two-column layout with a table and a footnote comes back as a puzzle.

There is a second, worse case: the PDF is a scan. Then it is not text at all, it is a photograph of text, and no converter can pull words out of it without OCR — optical character recognition, which reads the shapes and guesses the letters. Two tests tell you which kind you have, before you waste time on a conversion:

1. Try to select a line of text with the mouse. If nothing highlights, it is a scan.
2. Search for a word you can see with the eye, using Ctrl+F or ⌘+F. If it is not found, it is a scan.

If it is a scan, you need a tool that does OCR, and OCR is where free plans usually stop. It is also where accuracy varies enormously with the quality of the original: a clean 300 dpi scan comes back almost perfect, a phone photo of a crumpled receipt does not.

Floor two · Merge, split and compress

These three are mechanical: they rearrange pages or squeeze them, and nothing is interpreted. That is why they are the safest jobs to hand to a free tool, and why they are also the ones your own computer often already does.

Merging and splitting are built into macOS Preview: open a PDF, show the thumbnail sidebar, drag another PDF into it to merge, drag pages out to split. Windows has no equivalent in the box, which is exactly why merge pdf is searched 3.823.100 times a month.

Compressing is the one that needs a warning. A PDF is usually big because of the images inside it, and compression works by making those images smaller — either fewer pixels or more JPEG damage. A contract that is mostly text can lose 80% of its weight and look identical. A portfolio of photographs cannot: something will visibly go. Any tool that promises to shrink every file by the same amount is describing a wish, not an algorithm.

Floor three · Edit

Editing a PDF means three different things, and the confusion is the reason so many people end up disappointed:

• Annotating — highlighting, adding a comment, drawing an arrow. Free everywhere, including in the browser and in Preview.
• Filling — typing into form fields. Free in most PDF readers when the form was built with proper fields.
• Changing the text that is already there — replacing a wrong date, fixing a name. This is the expensive one, because the editor has to reflow a page that was never meant to reflow, and match a font that may not be installed on your machine.

If what you actually need is the third, and the document matters, converting back to Word, fixing it there and exporting a fresh PDF is often faster and cleaner than fighting a PDF editor. It is also free, if you already have a word processor.

Floor four · Sign

Here two very different things share a word, and the difference is legal, not technical.

Pasting an image of your handwritten signature onto a page is a picture of a signature. Anyone who can open the file can copy that image onto another one. It is fine for an internal form, and it is what most free tools mean by "sign".

A digital signature is a cryptographic seal: it binds the document to a certificate, so that any later change to the file breaks the seal and shows it. Whether one, the other or neither is legally sufficient depends on the country and on the kind of document — an employment contract, a property deed and a school permission slip are not held to the same standard. We are not lawyers and this page is not legal advice: if the document has consequences, the question to ask is which standard the receiving party requires, before choosing a tool.

Where your file goes

Every online converter works the same way: your document leaves your machine, is processed on a server and comes back. That is not sinister, it is how the tool works — but it is a decision you are making about a file, and for a payslip or a passport scan it deserves ten seconds of thought.

The serious operators say what they do. iLovePDF, one of the largest, states in its FAQ: We just keep them for a maximum of 2 hours so you can download them. Right after, they are completely removed forever from our servers. Checked on 20 August 2026 on ilovepdf.com/help/faq. A promise is not a proof, but a vendor that publishes a retention window and a deletion policy has at least made a commitment you can hold them to. One that says nothing has not.

The rule of thumb: mechanical jobs on ordinary documents, online is fine. Anything with a national ID number, a medical record, a salary or a client's data on it — do it locally, with the tools already on your computer.

What the paid ones cost

One verified example, so the numbers on this page are real rather than typical. iLovePDF, read on its pricing page on 20 August 2026:

Sixty euros a year is roughly five euros a month for a set of jobs your operating system does for free — unless you do them every day, in batches, on files bigger than the free caps, or you need OCR. That is the honest test for this whole floor: count how many times last month you actually needed it. For most people the answer is two, and the answer to the tool is no.

What is not on this page yet

Verdicts. We have not run these tools side by side for two weeks on real work, so we are not going to tell you which is best — that is what our method requires before a recommendation is worth reading. The comparisons are being written now, one floor at a time, and each will carry the date it was tested and the version it was tested on.

If you want to write one of them, the door is open: claim a floor.