Looking for a PDF24 Alternative?
PDF24 is a German-built PDF utility with a strong reputation in Europe — over 30 online tools, a free Windows desktop app, German hosting, and an emphasis on cost-free use. The catch is the same one most “free” web PDF tools have: every operation in the online toolset uploads your file to PDF24’s servers for processing. The desktop app is local, but Windows-only. If you’re on Windows and want offline-by-default, PDF24’s desktop is a legitimate pick. If you want browser-only with no upload regardless of operating system, Signegy is the alternative.
This page is the honest “Signegy vs PDF24” — where each tool wins, and where the choice depends on what you’re doing.
What PDF24 Actually Is
PDF24 (technically PDF24 Tools by geek software GmbH, based in Berlin) runs two products under one brand.
PDF24 Online at pdf24.org is the web-based tool set — 30+ tools spanning sign, merge, split, compress, convert, OCR, page numbering, watermarking, and a long tail of niche operations like PDF-to-ODT and document comparison. It’s free, ad-supported, and uploads files to PDF24’s German servers for processing.
PDF24 Creator is a free Windows desktop application that bundles a virtual PDF printer, a PDF editor, and offline versions of most of the online tools. It’s free to download and install. It’s also Windows-only — no Mac, no Linux, no mobile.
The two-product model is similar to Soda PDF’s, but with a different tone: PDF24 doesn’t push subscriptions or save-time account gates aggressively. The Online tools are ad-supported but don’t upsell as hard. The Desktop app is genuinely free without a paid tier. PDF24 monetizes through ads and through their PDF API for developers — not through the end-user funnel.
Why Signegy Doesn’t Need a Desktop App
PDF24 needed to build a desktop app because their online tools require server processing, and a Windows install was the only way to give users an offline-by-default option. If your reason for wanting PDF24 Creator is “I don’t want my files going to a server,” the desktop install solves it on Windows.
Signegy solves the same problem in the browser. The PDF you drop in is processed by JavaScript and WebAssembly running in your browser tab. Nothing uploads. The result is downloaded from your browser. No install, no Windows requirement, no Mac/Linux gap.
The trade-off: a browser tab is more constrained than a desktop process. Big files (north of 100MB) push browser memory. Multi-language OCR isn’t practical because each language pack is a 5–30MB WebAssembly download. Some operations (genuine in-place text editing, complex layout reconstruction) are hard in JavaScript. These are real limits and we name them throughout the tools page.
But for the bread-and-butter operations — sign, merge, split, compress, convert, rotate, fill, annotate — the browser handles them well, and the privacy property holds without any install. The private PDF signing page covers the architecture.
Tool-by-Tool Comparison
| Tool | PDF24 Online | PDF24 Desktop | Signegy |
|---|---|---|---|
| Sign | Free, server upload | Free, local | Unlimited, browser-only with audit cert |
| Merge | Free, server upload | Free, local | Unlimited, browser-only |
| Split | Free, server upload | Free, local | Unlimited, visual + range syntax |
| Compress | Free, server upload | Free, local | Unlimited, sliders, browser-only |
| Image to PDF | Free, server upload | Free, local | Unlimited, drag-to-reorder |
| Word to PDF | Free, server upload | Free, local | Browser-only via mammoth.js |
| OCR | Multi-language, server upload | Multi-language, local | English only, browser-only |
| PDF to ODT | Yes (server) | Yes | Not available |
| PDF to ePub | Yes (server) | Yes | Not available |
| PDF to Word | Yes (server) | Yes | Not available |
| PDF compare/diff | Yes (server) | Yes | Not available |
| Page numbers | Free, server upload | Local | Free, browser-only |
| Watermark | Free, server upload | Local | Free, browser-only |
| Annotate | Free, server upload | Local | Free, browser-only |
| Fill forms | Free, server upload | Local | Browser-only |
| Repair PDF | Free, server upload | Local | Free, browser-only |
| Crop pages | Free, server upload | Local | Free, browser-only |
| Edit metadata | Free, server upload | Local | Free, browser-only |
| Rotate pages | Free, server upload | Local | Unlimited, per-page |
| Mac / Linux support | Yes (online only, uploads) | No | Yes (browser, no upload) |
| Mobile support | Yes (online only, uploads) | No | Yes (browser, no upload) |
| Install required | No (online); Yes (desktop) | Yes (Windows only) | No |
| Audit certificate on signing | No | No | Included free |
PDF24 has more tools — particularly in the conversion long tail (ODT, ePub, comparison) and the multi-language OCR. If those are core to your workflow, PDF24 is the better tool. For everything else in the table above, Signegy covers the same ground without the upload.
The Privacy Story, By Operating System
This is where the choice gets interesting and depends on what you’re using.
On Windows. Both options exist. PDF24 Creator is a free local install — files stay on your Windows machine, no upload. Signegy is browser-only — files stay in your browser tab, no upload, no install. If you don’t want a software install, Signegy. If you’d prefer a desktop app for some reason (maybe you handle 200MB PDFs and don’t want browser memory pressure), PDF24 Creator. Both are legitimately private.
On Mac, Linux, ChromeOS, mobile. PDF24 Creator doesn’t exist for you. PDF24 Online does, but it uploads. Signegy is the cross-platform browser-only path that gives you the privacy property without an install — because the install isn’t an option in the first place.
The verifiable test is the same on any OS: open browser DevTools, go to the Network panel, drop a PDF into Signegy, perform an operation, watch for POST requests with file payloads. There won’t be any, because there’s no server doing the work. With PDF24 Online you’d see your file uploaded.
Where PDF24 Is Genuinely Better
A few honest cases where PDF24 is the right pick:
You need niche format conversions. PDF-to-ODT, PDF-to-ePub, PDF-to-LaTeX, image-format converters we don’t have. PDF24 has a long tail of these. Signegy is focused on the common 17 tools.
You need PDF comparison/diff. Comparing two versions of a PDF and seeing what changed. PDF24 has it. We don’t. Specialist tools (Draftable, Diffchecker) do it best, but PDF24 covers the basic case.
You need multi-language OCR. PDF24 supports many languages on both Online and Desktop. Our OCR is English-only — each Tesseract language pack is a 5–30MB WebAssembly download and we deliberately ship just one to keep the page weight reasonable.
You’re on Windows and want offline-by-default. PDF24 Creator is a legitimate free Windows install with no paid tier and no friction. If you handle PDFs frequently on a Windows machine and want a native desktop app, PDF24 Creator is well worth installing.
You’re already on PDF24 and the workflow fits. Switching tools is friction. PDF24 has been around for a long time, has decent compliance posture (German hosting, GDPR-native), and isn’t going anywhere. If it works, there’s no rush.
Where Signegy Is the Right Switch
The clearest cases:
You’re on Mac, Linux, ChromeOS, or mobile. PDF24 Creator doesn’t exist for you, and PDF24 Online uploads. Signegy is the cross-platform browser-only path.
You don’t want to install software. PDF24 Creator is a Windows installer. Signegy is a URL.
You want the privacy property without trusting the install/upload boundary. PDF24 Creator is local on Windows; PDF24 Online uploads. Signegy gives you the local-processing property in the browser, on any OS, with the architecture verifiable in DevTools in 30 seconds.
You want a verifiable cryptographic audit certificate when signing. Signegy generates one automatically on every signature. The verify page lets anyone check the certificate without signing in. PDF24 doesn’t have this.
You don’t want ads in the workflow. PDF24 Online is ad-supported (it has to fund the server hosting). Signegy doesn’t run ads — the static-page model doesn’t have anywhere to put them and we don’t have a need to monetize.
You only need the common tools. Sign, merge, split, compress, image-to-PDF, word-to-PDF, OCR (English), rotate, crop, page numbers, watermarks, metadata edit, annotate, fill, repair — all 17 Signegy tools cover the same ground PDF24’s most-used tools cover, all free, all browser-only, all cross-platform.
Getting Started
If your need is signing, sign a PDF takes about 30 seconds end-to-end and produces a downloadable PDF plus an audit certificate. The full tool list is the index. For a head-to-head with PDF24’s most popular operation, try compress PDF on the same file in both and compare output sizes and quality.
For other comparison angles, the Smallpdf alternative, iLovePDF alternative, and Sejda alternative pages cover the same questions from neighboring competitors.
PDF24 pricing and feature claims accurate as of May 2026. Visit pdf24.org for the latest information.
Frequently Asked Questions
Does PDF24 actually upload my files?
Yes — PDF24's online tools (pdf24.org/en/) upload your file to their servers in Germany for processing, then make the result available for download. They commit to deletion within a defined window. PDF24's free Windows desktop app is local-only, but the web tools are server-based. Signegy's web tools are browser-only — no upload at all, on any platform.
Where is PDF24 legitimately better than Signegy?
Tool count is the main one. PDF24 has 30+ tools including some niche conversions we don't have — PDF to ODT, PDF to LaTeX, PDF to ePub, multi-language OCR, comparison/diff between two PDFs. PDF24 also has a free Windows desktop app, which is genuinely useful if you're on Windows and want offline-by-default. Their German hosting and mature compliance posture matters in some EU regulated contexts.
Can I use Signegy on Mac and Linux like the PDF24 desktop app?
PDF24's desktop app is Windows-only — Mac and Linux users have to use the web tools, which upload. Signegy works on Mac, Linux, Windows, ChromeOS, iOS, and Android the same way: open the URL in any modern browser. No install, and no upload regardless of OS.
Is Signegy actually open source like some PDF24 components?
PDF24 isn't strictly open source, but they build on open libraries. Signegy is built on the same kind of open libraries — pdf-lib, pdf.js, mammoth.js, Tesseract.js — so the underlying engines are auditable. The Signegy application code itself isn't currently open-sourced, but the privacy property doesn't depend on trusting our source: the browser DevTools Network tab shows whether or not your file is being uploaded, and with Signegy it never is.
What about PDF24's compare-PDFs tool? Does Signegy have anything like it?
No — PDF diff/compare is a tool we don't have. PDF24 does it well, and a few specialist tools (Draftable, Diffchecker) do it better. If comparing two versions of a PDF is core to your workflow, PDF24 is a better fit. We have edit-metadata, annotate, and the standard suite, but not document comparison.