Overview

PDF24 Compare PDF is a browser-based tool for finding text differences between two PDF versions. It suits readers who want a free comparison without installing software; its clearest advantage is local browser processing, while offline use is limited to Windows.

Changed, added and removed text is marked, and you can inspect the documents side by side, overlaid or with a slider. That range of views makes the tool useful for checking revisions in different layouts, though it is not a substitute for a desktop workflow on Linux or macOS.

Key features

The comparison runs in the browser without installation or registration. PDF24 states that files are compared directly in the browser and are not uploaded to its servers. Google Drive is also offered as a file-selection option. This is a practical fit for users who want to avoid installing a comparison app, but those who require offline processing must use PDF24 Creator on Windows.

PDF24 says its file transfers are SSL secured, its servers are in Germany and server files are automatically deleted after one hour. It also says a data-processing agreement for its online tools can be requested by email or contact form. PDF24 Tools extends beyond comparison: it supports Office file comparison, importing existing PDFs, creating fillable forms and signature fields, and exporting to PDF. Inputs include Word and Excel files, images, printable files, scanners and cameras.

Pricing

Free — 0.00 USD per free. The plan is funded by advertising and has no limits, registration requirement or time restrictions. It includes PDF and Office file comparison. With no stated usage cap or subscription, it suits individuals and companies that need recurring comparisons without a paid plan; advertising is the trade-off.

PDF24 says its online tools are available to companies free of charge and without restriction. There is no separate paid online tier to move to for more usage. Companies needing an offline deployment can use PDF24 Creator free, including with Citrix, but only on Windows.

Platforms

The comparison tool is deployed on the web, and PDF24 lists Android, iOS, Linux, macOS and Windows among its platforms. 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. That browser-based route may suit users comfortable installing outside those stores; readers who require a store-listed app should look elsewhere.

For offline processing, PDF24 Creator keeps files on the local PC, but runs only on Windows. Linux and Mac users therefore have no equivalent offline option from PDF24.

Who it's for

PDF24 Compare PDF is a strong choice for people who need to compare PDF revisions at no cost, especially when they value browser-based processing, multiple visual comparison modes or company use without a subscription. It is less suitable for teams that require an offline tool across operating systems, or for mobile users who only install apps through official stores.

Pros and cons

Pro — No-cost, unrestricted online use: PDF24 says there are no limits, registration requirements or time restrictions, including for companies.
Pro — Three comparison views: Side-by-side, overlay and slider layouts offer different ways to inspect marked text changes.
Pro — Browser-local comparison: PDF24 says the documents are compared in the browser rather than uploaded to its servers.
Con — Offline use is Windows-only: PDF24 Creator is not supported on Linux or macOS.
Con — Mobile installation is outside app stores: PDF24 Tools must be installed from a browser rather than Google Play or the App Store.

Alternatives

SmarterDiff is another free, ad-supported option for personal and commercial use, with no account or artificial limits and coverage across Android, iOS, Linux, macOS, web and Windows. Choose it if you want a similarly broad platform range and free use; PDF24's specific advantage is its stated browser-local comparison and three PDF review views.

Litera Compare suits buyers seeking a paid desktop comparison product with a one-year license term; online purchases are limited to 10 seats. Its price is custom pricing, so PDF24 is the more direct fit when free, unrestricted use matters more than a paid license.

Diffchecker offers a free Basic plan with limited Pro access and monthly try counts, plus a Pro + Desktop plan at 15.00 USD per month. Consider it if you want a paid desktop tier; PDF24 avoids a monthly charge and usage caps on its free plan.

Differino is a web and API option whose free plan allows one comparison, files up to 45 MB, PDF, DOCX and TXT, watermarked PDF export, two versions per document and 14-day retention. Choose it when those format and sharing constraints fit your task; PDF24 is the better fit for unlimited free comparison without registration.

DocFather Compare Documents is a web-based alternative.

Document Delta offers a free demo for DOCX files up to 500 KB per file, making it an option when a small DOCX comparison is all you need.

XKit Document Compare is a free web tool with no signup or file restrictions. It is worth considering if you want an explicitly unlimited web comparison alternative.

AFileFix Document Comparison is free, requires no signup and accepts PDF or DOCX files up to 25 MB; documents over approximately 150 pages may be truncated. Choose it if you need DOCX support and your files fit those limits.

For a wider shortlist, see Document Comparison Software, PDF Creation Software, PDF Form Software, PDF Merger Software and PDF Compression Software.

Verdict

Choose PDF24 Compare PDF if you need a no-cost way to identify PDF text changes in a browser, with no registration, usage limits or time restrictions. Its local browser processing and flexible views are compelling; look elsewhere if offline work on macOS or Linux, or a store-distributed mobile app, is essential.

	Compare Suite	PDF24 Compare PDF
Free plan	Yes	Yes
Free trial	Yes	No
Paid from	Free	Free
Open source	No	No
Platforms	Windows	Android, iOS, Linux, macOS, Web, Windows
Free plan	Yes	Yes
PDF comparison	—	Yes
Office file comparison	—	Yes
Deployment	—	web

Compare Suite vs PDF24 Compare PDF

Compare Suite

PDF24 Compare PDF