PDF tools compared

What actually changes between server side and browser side processing?

The difference is where the file sits at the moment it is read. In a server side service the PDF travels over the network, is written to disk or memory on a machine that is not yours, is processed there, and the result comes back. In a browser side tool the file is read by JavaScript already loaded in the page and never exists outside your computer.

This is not a question of trusting a privacy policy. It is a question of what is technically possible. A service that never receives the file cannot store it, index it, train a model on it or hand it to a third party under a court order, because it does not have it.

What happens when you upload a file to an online service

The file is transferred over HTTPS to the provider's infrastructure. From then on you depend entirely on that company's practices: how long it keeps the file, where it keeps it (which country, which jurisdiction), who has access, and what the retention policy says. Serious providers delete after a few hours and say so. That is still a promise, not an impossibility.

What happens in a browser based tool

The page loads JavaScript libraries (in our case pdf-lib, pdf.js and JSZip) and uses the browser's own file API to read the PDF you picked. Processing runs on your own processor. The resulting file is built in memory and downloaded locally. Once the page has loaded, this works with no internet connection.

Comparison table by architecture and price

List prices published by the providers themselves, checked on 31 July 2026, in the currency each one publishes. Annual plans from the competitors are usually cheaper per month than paying monthly.

What each free tier costs you, measured in limits

No free tier is unlimited. What changes is the unit of the limit and what happens when you hit it.

• BestPDFInTheWorld: one free tool, compress PDF, capped at 10 MB per file and five uses per day. The other eleven need a subscription. No watermark on the output.
• iLovePDF: the tightest free tier among the big names, around two tasks per day before it asks you to subscribe.
• Smallpdf: around two tasks per hour on the free tier. Uploading a large file and waiting for processing both count against the limit.
• Sejda: one of the most generous free tiers, around three documents per hour, up to 200 pages or 50 MB.
• PDF24: no task limit and no watermark. It monetises through advertising instead of subscriptions.

If price is the only criterion, PDF24 wins: it is free and has no task limit. Our proposition is not to be cheaper than free, it is to be the only one where the file never leaves your computer, at a fixed price and with no advertising.

How to check for yourself whether a site uploads your file

You do not have to take anyone's word for it, including ours. The browser will show you. The procedure takes under a minute and works on any site:

1. Open the tool's site and press F12 (or right click and choose Inspect).
2. Go to the Network tab and clear the list.
3. Pick your PDF and run the operation.
4. Look at the size column. A POST request roughly the size of your file means the file was uploaded.

In a local tool the only requests you see are libraries and fonts, all at a fixed size independent of the PDF you chose. You can repeat the test with a 1 MB file and a 20 MB file: if outbound traffic does not change, nothing was uploaded.

When a server is the right choice

Browser processing has real limits, and there are cases where a server side service is better. Said out loud:

• Optical character recognition (OCR): we do not do it. A scan with no text layer still has no text after passing through our tools. Server side services with OCR solve that.
• Very large files: the ceiling becomes browser memory. A PDF of several hundred megabytes can exhaust it, especially on a phone.
• Automation through an API: there is no API. Anyone processing a thousand PDFs a night on a server needs a service that has one.
• Conversion with layout fidelity: our PDF to Word extracts text and does not preserve tables, images or columns. Commercial tools with dedicated engines do better.

What BestPDFInTheWorld does not do

Twelve tools, not twenty. No OCR. No API. No text editing inside the PDF. No cloud storage and no history, because there is no server to store anything on. The signature is visual and is not a qualified electronic signature. Compression rasterises the pages, which shrinks the file a lot and makes the text stop being selectable.

If any of those matters to you, one of the services in the table above serves you better, and it is better to find that out now than after paying.

Sources

• Omnibound, Generative Engine Optimization Statistics (2026)
• Smallpdf, planos e preços
• iLovePDF, planos e preços
• Sejda, planos e preços
• PDF24, ferramentas