PDF24 Review: Features, Limits & Pricing

PDF24 is a free suite of PDF tools built by Geek Software GmbH, a German company that's been developing it since 2006. It ships two distinct products worth telling apart: PDF24 Creator, a free Windows-only desktop app that installs locally and processes files entirely offline on your PC, and PDF24's online tools (tools.pdf24.org), a browser-based suite covering merging, splitting, compressing, converting to and from Word/Excel/PowerPoint, OCR, editing, and dozens more operations that upload your file to PDF24's servers for processing. These are genuinely different products with different privacy models, not just two names for the same thing, despite sharing a brand and website. There's no companion desktop app for Mac or Linux, so those users are limited to the web tools. Roughly two dozen operations across both surfaces put it in the same category as iLovePDF and Smallpdf, but PDF24's split between a local app and a server-based web suite is unusual in this space.

It depends which PDF24 you use — this is the one question where the desktop/web split actually matters. PDF24 Creator processes files locally and never uploads anything, so there's no server-side risk at all. The web tools work differently: dropping a file into Compress, Merge, or Convert on tools.pdf24.org uploads it to PDF24's servers over an encrypted connection, and the company states files are deleted from its servers within about an hour of processing. That's a reasonable retention window compared to competitors, and there's no public record of PDF24 mishandling files. Still, for the web tools, your document does leave your device during processing, however briefly — the same trade-off every server-based PDF tool makes. If you're handling something sensitive, the desktop Creator app is PDF24's own answer to that concern; if you're on Mac, Linux, or don't want to install anything, that leaves the web tools' server round-trip as the only PDF24 option.

PDF24 covers the standard PDF operations plus a few extras. Across the web tools and Creator combined: merge, split, compress, rotate, and reorder pages; convert to and from Word, Excel, and PowerPoint; image-to-PDF and PDF-to-image; OCR for scanned documents; password protection and unlocking; watermarking; page numbering; and basic editing (adding text, images, and signatures). PDF24 Creator also adds a virtual PDF printer that generates a PDF from any Windows application's print dialog, plus batch processing across many files at once — both are Creator-only, not available in the web tools. The web suite alone runs to dozens of individual tool pages, each built around one operation. It's not the widest catalog in the category (CloudConvert's 200+ format pairs and iLovePDF's AI tools go further), but it covers the everyday PDF tasks most people need, without gating any of them behind a paywall.

There isn't really a "free plan" to work around — PDF24 doesn't meter usage the way iLovePDF or Smallpdf do. No account is required for either the web tools or Creator, there's no published daily task cap, and output files carry no watermark. The one real constraint is a per-file size limit on the web tools (around 100 MB, per PDF24's own documentation), which the desktop Creator app doesn't share since it isn't routing anything through a server. PDF24 funds this by running ads on its web tool pages — described in user reviews as present but not aggressive — rather than pushing a subscription upsell. That's a genuinely different model from most competitors in this review series, where the free tier is deliberately narrow to convert regular users into paying ones.

PDF24's consumer tools — both Creator and the web suite — are free, full stop, with no premium tier, no paywalled features, and no account required. The company's actual revenue comes from business-facing products sold separately: a paid REST API for developers building PDF processing into their own software, server licenses for companies running PDF24's engine on their own infrastructure, and OEM licensing of the underlying technology. None of that touches the free consumer experience at pdf24.org or in the desktop Creator app. There's no dollar figure to quote here because, unlike iLovePDF's Premium or Smallpdf's Pro, there isn't a consumer-facing paid tier to compare against. Check PDF24's own site for current API and licensing terms if you're evaluating it for a business integration, since those are the only priced products it sells.

Both PDF24 products are functional but unpolished next to the more design-forward competitors in this category. The web tools follow the now-standard pattern — pick a tool, drop a file, wait a few seconds, download — and work reliably, though the interface looks dated next to Smallpdf's more modern design. PDF24 Creator's main friction point, echoed across independent reviews, is that its many features are split across several different windows and modes rather than unified in one editor, so a multi-step job like merge-then-compress-then-watermark means navigating between tools rather than staying in one flow. Neither product requires a learning curve for a single operation. For someone who just wants to merge two files or convert one document, either surface gets the job done in under a minute; for more involved, multi-step editing, the tool-switching becomes the main annoyance.

PDF24 Creator already proves local processing is possible — it just does it as a Windows-only desktop install rather than in a browser tab, which leaves Mac, Linux, and Chromebook users stuck with the web tools' server upload. Browser-based tools like pixeltools close that gap: the same local-processing idea, but running as JavaScript in any browser on any OS, with nothing to install and nothing uploaded. Pixeltools' compress-pdf tool, for example, runs entirely client-side on pdf-lib — it scans a PDF for embedded JPEG images (the actual source of bloat in most scanned or photo-heavy PDFs) and recompresses just those at a lower quality in your browser tab, leaving text and vector graphics untouched, so there's no server round-trip and no per-file size cap tied to a plan. This isn't a claim that pixeltools' PDF catalog is as broad as PDF24's — it isn't — but for merge, split, or compress specifically, it's a way to get PDF24 Creator's local-processing privacy without needing Windows or an install.

PDF24 is a legitimately free option in a category full of freemium upsells — no account, no watermark, no daily cap, and no premium tier blocking core features on either the desktop app or the web tools. Its trade-offs are real but different from the usual ones: PDF24 Creator's local processing is Windows-only, its web tools still route files through a server like any competitor, and the interface on both trails more polished paid-and-free hybrids like Smallpdf. If you're on Windows and want a genuinely free, install-once tool with no server upload, PDF24 Creator is a strong pick. If you're on another OS, or you'd rather skip installing software at all, either PDF24's web tools or a client-side browser tool are the realistic options — and for a simple, one-off job like a merge or compress, a browser-based tool skips PDF24's upload step entirely without asking you to install anything.