Compare Two PDF Files Online for Free
Compare two PDF files online for free and quickly find additions, deletions, and text edits side by side. FileDiffs runs the PDF comparison directly in your browser, so your file contents stay on your device. No signup or software installation is required.
How to Compare PDF Files Online
Compare two PDF files in three simple steps:
- Add the original PDF file to the left panel.
- Add the modified PDF file to the right panel.
- Click Compare to see additions, deletions, and edited text highlighted side by side.
Tip: FileDiffs works best with PDFs that contain selectable text. If your PDF is scanned, run OCR first to create a searchable text layer. FileDiffs works in modern browsers including Chrome, Edge, Firefox, and Safari. You can review differences using Side-by-Side and Original/Modified visual views and export a comparison report when needed.
Text-Based PDFs vs Scanned PDFs
A text-based PDF contains selectable text that FileDiffs can extract and compare directly. This makes it easier to detect changes in words, numbers, dates, clauses, and other written content between two PDF versions.
A scanned PDF may contain only images of pages, with no searchable text layer. In that case, run OCR first to create selectable text before comparing the files.
FileDiffs focuses on text-based PDF comparison. Changes to images, graphics, or other purely visual elements may not be detected.
Common Reasons to Compare Two PDF Files
PDF comparison is useful whenever you need to review changes between two versions of the same document:
- Contracts — Compare contract drafts to find changed clauses, dates, payment terms, or other wording.
- Invoices — Check revised invoices for changes in amounts, quantities, dates, or payment details.
- HR documents — Compare offer letters, policies, and templates before approval or distribution.
- Manuscripts — Review revised manuscripts or proofs to identify added, deleted, or edited text.
- Vendor quotes — Compare PDF quotes to find changes in pricing, terms, and conditions.
- Compliance documents — Review policy or procedure updates and identify what changed between versions.
Comparing PDF files side by side helps you focus on the changed content instead of manually rereading both documents.
What Differences Can PDF Compare Detect?
FileDiffs extracts the available text from both PDF files and compares it to identify changes such as:
- Added text — new words, sentences, clauses, or sections
- Deleted text — content removed from the original PDF
- Edited wording — changes to existing text
- Numbers and dates — changed amounts, totals, percentages, or dates
The differences are shown side by side so you can quickly review changed text between the two PDF files.
Examples of PDF Differences
Here are a few examples of changes a PDF comparison can help identify:
- Contract payment term — "Net 30 days" changes to "Net 45 days."
- Invoice total — $4,250.00 changes to $4,725.00.
- Effective date — 01 Jan 2025 changes to 01 Mar 2025.
- Rewritten clause — wording in a contract, policy, or agreement is revised.
- Added or removed text — a new section is introduced or existing content is deleted.
FileDiffs highlights these text differences so you can review important changes without manually checking every line.
Why Use FileDiffs for PDF Comparison?
FileDiffs compares PDF files directly in your browser, so your file contents stay on your device during the comparison. There is no software to install, and the free side-by-side view does not require an account.
The tool helps you detect changes in words, numbers, dates, clauses, and other selectable text, making it useful for comparing contracts, invoices, reports, policies, and other PDF documents.
Key Features of PDF Compare
- ✓Compare two PDF files online
- ✓Find added, deleted, and edited text
- ✓Side-by-side PDF comparison
- ✓Detect changes in words, numbers, and dates
- ✓Color-coded additions and deletions
- ✓Drag and drop two PDF files
- ✓Free side-by-side view with no account required
- ✓Original/Modified visual view
- ✓Export comparison report
- ✓Browser-based processing
- ✓Files stay on your device
Frequently Asked Questions About PDF Comparison
Add the original PDF and the modified PDF, then click Compare. FileDiffs extracts the available text from both files and highlights additions, deletions, and edits in a side-by-side comparison view.
Yes. FileDiffs lets you compare two PDF files online for free. You can review differences using Side-by-Side and Original/Modified views and export a comparison report when needed.
No. FileDiffs processes the PDF contents locally in your browser, so your files stay on your device during the comparison.
Scanned PDFs may contain images instead of selectable text. Run OCR first to create a searchable text layer, then compare the resulting PDF files with FileDiffs.
Yes. FileDiffs can detect changes in words, numbers, amounts, percentages, and dates when they are available in the PDF's selectable text layer.
Explore Other Comparison Tools
PDF Compare Tool Reviews
"Excellent tool for auditing document revisions. Best part is files never upload to a server. Simple and secure."
"Really clean side-by-side layout for PDF comparisons. The text highlighting is fast and exact."
"I compared two dense PDF drafts and it instantly highlighted the line differences. Saved me an hour of manual proofreading!"