PDF24 Compare PDF

Overview

PDF24 Compare PDF finds text differences between two versions of a PDF and presents them in three visual layouts. It is best for people who need to check revisions without installing a desktop app. Its strongest advantages are unrestricted free access and browser-side comparison; offline work is a narrower case, supported only on Windows through PDF24 Creator.

Key features

The tool marks text that has changed, been added or removed, then lets you review the documents side by side, in an overlay or with a slider. That is useful when a reader needs either a direct comparison or a visual sense of how pages align. PDF comparison is the central use; the broader toolset also supports Office file comparison, but the supplied capabilities do not establish a wider review workflow beyond those formats.

Comparison runs in the browser without installation, and PDF24 says the files are compared there rather than uploaded to its servers. Google Drive is offered as a file-selection option. PDF24 says transfers are SSL secured, its servers are in Germany and server files are automatically deleted after one hour. Those protections apply to server handling; the comparison itself is described as local browser processing.

PDF24 Tools also includes PDF-related capabilities such as importing existing PDFs, creating fillable forms and signature fields, and exporting to PDF. Its input sources include Word, Excel, images, printable files, scanners and cameras. These extras make the surrounding toolset more useful than a single-purpose comparator, though they do not change the focused comparison experience.

Pricing

The Free plan costs nothing, is funded by advertising, and has no limits, registration requirement or time restrictions. PDF24 says there are no subscription traps or forced premium versions. This is a strong fit for individuals and companies that need regular comparisons without per-seat or usage caps; PDF24 says company use of its online tools is free and unrestricted.

The main trade-off is deployment rather than price. The web version needs a browser, while offline processing is handled by PDF24 Creator on Windows. PDF24 Creator can be used with Citrix and is free for companies, but it cannot be installed on Linux or Mac. Companies can request a data processing agreement for the online tools by email or contact form.

Platforms

The listed platform coverage spans Android, iOS, Linux, macOS, web and Windows. The comparison itself is browser-based. PDF24 Tools can be installed from a browser on Android and iPhone or iPad, but is not distributed through Google Play or the App Store. For offline work, PDF24 Creator is limited to Windows, so Linux and Mac users should choose the browser route.

Who it's for

PDF24 Compare PDF suits individuals, teams and companies that need to spot text changes between PDF versions without paying for a subscription or installing software. Its local browser processing is especially relevant for people who prefer not to send comparison files to a server. It is less suitable when offline use on Mac or Linux is essential, or when the need extends beyond comparing PDFs and Office files.

Pros and cons

• Pro: No usage ceiling or signup. PDF24 says the free online tools have no limits, registration requirement or time restriction, making them practical for repeated use.
• Pro: Three comparison views. Side-by-side, overlay and slider layouts give readers different ways to examine marked text changes.
• Pro: Browser-side comparison. PDF24 says the files are processed directly in the browser rather than uploaded to its servers.
• Con: Offline desktop use is Windows-only. PDF24 Creator does not support Linux or Mac installation.
• Con: Mobile distribution takes an extra step. PDF24 Tools can be installed from a browser, but it is not in the major mobile app stores.

Alternatives

For a broader set of document-comparison options, see Document Comparison Software. If the task is creating forms rather than comparing revisions, PDF Form Software is the more relevant category. For making PDFs, use PDF Creation Software; for reducing file size, PDF Compression Software; and for combining files, PDF Merger Software.

PDFgear is another free option with Android, iOS, macOS, web and Windows coverage; its online editor has a 100 MB per-PDF limit. Choose Sejda PDF Forms if its form-focused tools fit better and its free desktop-and-web page, hourly, upload and tool-specific limits are acceptable. PDF Studio offers a free viewer for reading, annotating and filling interactive forms across Windows, Mac and Linux, while its Pro plan costs $149, paid once. For a mobile scanning alternative, Adobe Scan is available on Android and iOS, with a free download and a free trial of Acrobat Pro.

Verdict

Choose PDF24 Compare PDF if you want a no-cost, no-registration way to compare PDF revisions and value browser-side processing. The three viewing modes and unrestricted company use make it a practical choice for routine text checks. Look elsewhere if offline comparison on Mac or Linux is a requirement, or if your priority is a broader document-review workflow.