April 9, 2026 · 8 min read
JustPDF vs PDF24: Which Free PDF Tool Is Right for You?
PDF24 is known as the "completely free" PDF tool. No paid tier, no usage limits, no upgrade prompts. But free doesn't always mean private. Here's how it actually compares to JustPDF when you look beyond the price tag.
Feature-by-feature comparison
Both tools cover the essentials: merging, splitting, compressing, converting, and signing PDFs. The differences show up in how your files are handled and what you give up for access.
| Feature | JustPDF | PDF24 |
|---|---|---|
| File processing | Browser-based (never uploaded) | Server-based (uploaded to German servers) |
| File retention | None | Claims deletion, timing unverifiable |
| Account required | ||
| Pricing | Free tier + $4/mo Pro | Completely free (ad-supported) |
| Ads and trackers | ||
| Number of tools | 17 | 30+ |
| Desktop app | Yes (Windows only) | |
| Mobile app | ||
| File size limit | Browser memory only | 100MB per file |
| E-signatures | ||
| OCR | ||
| Privacy verification | Open (check Network tab) | Not verifiable |
Where PDF24 wins
Credit where it's due. PDF24 has built a genuinely free product with an impressive tool count and native app support. These are real advantages:
- Completely free with no paid tier.There's no Pro plan, no usage cap, and no upgrade prompt. Every tool is available to every user at no cost. For users who process a high volume of files and aren't concerned about server uploads, this is a meaningful benefit.
- 30+ tools. PDF24 covers more operations than most competitors. Beyond the standard merge, split, and compress, it offers niche tools for comparing PDFs, creating PDF books, adding page numbers, and more. If you need an obscure PDF operation, PDF24 probably has it.
- Desktop app for Windows. The PDF24 Creator application runs natively on Windows and includes a virtual printer driver, letting you convert any printable file to PDF without opening a browser.
- Mobile apps.PDF24 offers dedicated Android and iOS apps for on-the-go PDF operations. JustPDF works in mobile browsers but doesn't have a standalone app.
- Broader file format support. PDF24 handles more conversion formats, including some less common document types.
Where JustPDF wins
JustPDF takes a fundamentally different approach to how your files are handled. If data privacy, speed, or a clean experience matter to you, these differences are significant:
- No ads or trackers.PDF24's free model is funded by advertising. That means display ads on the site and third-party tracking scripts running in the background. JustPDF has no ads, no tracking pixels, and no third-party analytics.
- True browser-based privacy. When you compress a PDF or merge documents with JustPDF, the files never leave your device. Processing runs entirely in your browser using JavaScript and WebAssembly. You can verify this yourself by opening your browser's Network tab — zero file uploads occur during any operation.
- Cross-platform without installation.PDF24's desktop app is Windows-only. JustPDF runs in any modern browser on Mac, Linux, Windows, and ChromeOS. No downloads, no installation, no compatibility issues. Tools like Rotate PDF and Unlock PDF work identically on every platform.
- Faster processing. Server-based tools require uploading your file, waiting for server-side processing, and then downloading the result. JustPDF skips all three network round trips. For operations like splitting or flattening a PDF, the result is often ready in under a second.
- Cleaner, distraction-free experience. No banner ads. No cookie consent popups triggered by ad networks. No promotional overlays. You open the tool, drop your file, and get the result.
The "free" trade-off
PDF24's business model is straightforward: the product is free because advertising revenue covers the cost. That means display ads on every page and server-based file processing that passes your documents through PDF24's infrastructure in Germany. Your files effectively fund the service by flowing through their systems.
This isn't necessarily malicious. PDF24 states they process files on servers in Germany under GDPR regulations and delete them afterward. But the timing of deletion isn't independently verifiable, and the fundamental architecture means your documents temporarily exist on someone else's hardware.
JustPDF's free tier costs nothing for a different reason: processing happens on your own hardware. There's no server infrastructure handling your files, which means there's no server cost to subsidize with ads. The Pro plan at $4/month exists for users who want unlimited daily operations, but the privacy model is the same whether you pay or not.
For a public flyer or a generic document, either approach works fine. For contracts, tax returns, medical records, legal documents, or anything you wouldn't email to a stranger, the distinction matters.
Who should choose which?
Neither tool is universally better. The right choice depends on what you prioritize.
Choose PDF24 if you:
- Need a completely free tool with no usage limits whatsoever
- Work on Windows and want a native desktop app with virtual printer support
- Need niche PDF operations beyond the standard set (PDF comparison, page numbering, booklet creation)
- Want dedicated mobile apps rather than using a browser on your phone
- Process non-sensitive documents and are comfortable with server-based handling
Choose JustPDF if you:
- Handle sensitive or confidential documents and want files to stay on your device
- Use Mac, Linux, or ChromeOS and need cross-platform tools without a Windows-only app
- Want a clean, ad-free experience without cookie banners and tracking scripts
- Prefer faster processing without upload and download wait times
- Need to verify privacy claims yourself (open DevTools, check the Network tab)
- Want tools like e-signatures, OCR, and AI PDF chat without exposing your documents to a server
Frequently asked questions
Is PDF24 really completely free?
Yes. PDF24 does not charge for any of its tools and has no paid tier. The service is funded by advertising. This means you get unlimited usage at no monetary cost, but your browsing data is used for ad targeting and your files are processed on their servers.
Does PDF24 store my files?
PDF24 states that files are processed on servers in Germany and deleted afterward. However, the exact deletion timing and process are not independently verifiable. With JustPDF, files never leave your browser, so there's nothing to delete on a server.
Can JustPDF do everything PDF24 does?
JustPDF covers 17 tools including merge, split, compress, PDF to Word, e-signatures, OCR, grayscale conversion, and more. PDF24 has 30+ tools, including some niche operations JustPDF doesn't offer. For the most common PDF tasks, both tools have you covered.
Why does JustPDF have a paid plan if PDF24 is free?
Different business models. PDF24 monetizes through ads and server-side processing. JustPDF's free tier provides 3 daily operations with no ads. The $4/month Pro plan removes the daily limit for users who need higher volume. Privacy is the same on both tiers.
Does JustPDF work offline?
After the initial page load, most JustPDF tools work without an internet connection because processing happens entirely in your browser. Server-based tools like PDF24 require a constant connection since your files must be uploaded and downloaded for every operation.
The bottom line
PDF24 is a strong product with a genuinely free offering. If you need maximum tool variety, a Windows desktop app, or truly unlimited usage without paying anything, it delivers. The trade-off is advertising, tracking, and server-based file handling.
JustPDF is built on a different premise: your files should never leave your device. If privacy, speed, and a clean ad-free experience matter more to you than having 30+ tools, JustPDF handles the core PDF operations without uploading a single byte.
For most people, the decision comes down to one question: are you comfortable with your documents passing through someone else's servers? If yes, PDF24 gives you everything for free. If not, JustPDF gives you privacy by default.