Why Compare PDFs?
Comparing PDFs saves time, reveals unexpected or unwelcome
changes, and helps you avoid costly mistakes.
- Authors & Publishers
- If you produce PDFs for publication, a PDF comparison tool can
show you the exact differences between, say, the first printing, and
your proposed second printing. This way you can easily spot unintended
changes to the pagination. Also, you can save time by checking only
those pages that have changed, rather than having to review the whole
publication all over again.
- Journalists, Police, and Other Investigators
- It is common to follow a paper trail of emails, memos, and so
on, as part of an investigation. This trail will often include PDF
documents. Using a PDF comparison tool will allow you to forensically
observe the evolution of a document—perhaps revealing when
critical changes were made.
- Legal Professionals, Legislators, & Freelancers
- When a contract, legislation, or other legal document is being
drawn up, how can you be sure that the changes made are correct, and are
only those agreed? By using a PDF comparison tool you can see
exactly what has changed between the latest draft and any
- As reports and other documents are developed they go through
many changes. If your company process uses PDFs, using a PDF comparison
tool will show you how each new version differs from its predecessor.
This saves you having to reread everything, and makes it much easier to
see what changes you want to comment on or change.
- Software Testers & Quality Assurance Engineers
- Many business processes produce PDFs as an output. Using a PDF
comparison tool makes it easy to verify that the PDFs are being produced
correctly, or to spot exactly where any mistakes have occurred.
And this can be especially useful as part of an automated testing
process, itself essential if the numbers or sizes of the PDFs is large.
The ComparePDF application makes it easy for
anyone to compare PDF files: simply choose the first PDF, then the
second PDF, and then click the Compare button. The changes are shown
visually in your PDF reader, as if you'd used highlighter pens to show
added, changed, or deleted text. It is an alternative to our DiffPDF application.
The comparepdfcmd tool is for more
technical users. It is a command line tool that can be used in batch
files, C# programs, Visual Basic scripts, and so on, to be integrated
into quality assurance or software test automation processes. It is an
alternative to our diffpdfc tool.
Our PDF comparison tools are well-established. Some have been
successfully used in all the roles described above—and many
others—for several years. They are in use in over fifty
countries throughout the world. They are widely used in the financial
sector (especially by banks and insurance companies), as well as by many
Note that unlike online PDF comparison tools our tools compare your PDFs
securely on your own computer, so no third party can see what you are
Each product is normally sold and licensed separately; however, our site licenses cover all our PDF
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