Compare PDF
Put two PDF versions side by side and spot every difference.
Document 1
Drop your PDF file here
Document 2
Drop your PDF file here
How to use Compare PDF?
- Step 1: Upload or add two PDF versions you want to check.
- Step 2: Upload the original file and revised file in the correct slots.
- Step 3: Click Compare PDF and wait while RashPDF prepares a comparison view or report showing changes.
- Step 4: Review the result, then download or continue with another PDF tool.
- Finds differences faster than manual review.
- Helps spot changed wording, layout, or missing pages.
- Creates a clearer review workflow for revisions.
Frequently Asked Questions
How do I compare two PDF files?
Upload your original and revised PDFs. The tool highlights all differences in a side-by-side view.
What types of differences are detected?
Text additions, deletions, formatting changes, and image differences are all detected.
How are differences displayed?
Additions are in green and deletions in red, making changes immediately visible.
Can I download the comparison result?
Yes. Download an annotated comparison PDF showing all detected differences.
Does it work for scanned PDFs?
It works but with lower accuracy. Comparison is text-based, so scanned PDF accuracy depends on OCR quality.
Is it free?
Yes. PDF comparison is completely free.
Who is Compare PDF useful for?
Compare PDF is useful for legal reviewers, editors checking revisions, and business teams approving reports. It is built for practical document work where you need a clean result quickly without learning a complicated desktop application.
What should I prepare before using Compare PDF?
Prepare two PDF versions you want to check and make sure it opens correctly before upload. If the file contains private, financial, legal, or client information, use the correct version and check the final output carefully before sending it to anyone else.
Which settings matter most in Compare PDF?
The most important setting is to upload the original file and revised file in the correct slots. A quick review before processing usually prevents mistakes such as wrong page order, missed ranges, low image quality, or using the wrong output option.
Will Compare PDF change my original file?
No. RashPDF creates a comparison view or report showing changes as a new result. Your original file stays on your device unchanged unless you later choose to replace it manually with the downloaded output.
How do I get the best result from Compare PDF?
Use the earlier version as the original and the newer version as the revised file to keep changes easy to read. Comparison quality depends on whether text is selectable and how similar the two layouts are. For important documents, open the downloaded result once before submitting, printing, archiving, or forwarding it.
Can I use the output with other RashPDF tools?
Yes. After using Compare PDF, you can download the comparison, edit the revised PDF, or share the final approved version. This conversion may use the RashPDF conversion service for advanced processing, and the result is returned to your browser when it is ready.
How PDF Comparison Works
Reviewing document revisions manually is slow and unreliable. A contract might go through fifteen revisions. A report might be updated across three cycles. A legal filing might be amended with changes spread across dozens of pages. Finding every change by reading both versions in parallel is error-prone and time-consuming. Our Compare PDF tool automates this by analyzing both documents simultaneously and presenting all differences in a clear, color-coded display.
Upload the original PDF and the revised PDF. The tool analyzes text content across both files and produces a comparison showing every addition, deletion, and change. Additions appear highlighted in green. Deletions are shown in red with strikethrough formatting. Unchanged content is shown normally. This color-coded display makes it immediately clear what changed between versions without reading every line.
The comparison is presented in a side-by-side view where you can see the original and revised versions together, with differences highlighted in context. This lets you understand not just what changed but where in the document the changes appear and how they affect the surrounding content.
A comparison report can be downloaded as an annotated PDF. This creates a permanent record of the differences between versions, which is useful for audit trails, legal review processes, and version control documentation.
For text-based PDFs, comparison accuracy is very high. Scanned PDFs have lower comparison accuracy because comparison operates on recognized text content, and OCR accuracy affects the comparison result.
Common applications include comparing contract revisions during negotiation, verifying that an updated policy document reflects all agreed changes, checking that a revised report incorporates all editor feedback, auditing changes between versions of a regulatory filing, and confirming that a legal amendment affects only the intended sections.
Step-by-step guide
Compare Two PDF Versions Before Approval