Compare PDF
A PDF comparison can only see the characters in the file's text layer, so this page extracts that text from both documents and diffs it. That makes it the right tool for a contract or report whose wording was edited, and the wrong one for a scanned page or a layout change — a distinction worth settling before you rely on an empty result.
Drop PDF here or click to upload
Supports PDF files up to 1024MB
Drop PDF here or click to upload
Supports PDF files up to 1024MB
Preguntas frecuentes sobre calculadoras en línea
Will it compare a scanned PDF?
No. A scan is a picture of a page, so there is nothing to extract and the comparison comes back empty. Optical character recognition would have to run on it first.
Does it show the pages side by side visually?
It previews the first page of each file and diffs the text. Differences that exist only in layout — a moved image, changed margins — are not reported as changes.
Will my original file be changed?
The result is downloaded as a separate file. Keep your original until you have checked the Extracted text diff.
What should I check before using the result?
Open the Extracted text diff in the application that consumes it and spot-check the parts that matter to you; the original file stays untouched if you need to re-run with different options.
Does it compare scanned PDF images?
Text-based PDFs compare reliably. Image-only scans may need OCR preprocessing before meaningful text diff results appear.
Is Compare PDF free?
Yes. This tool is free with no trial limit, subscription, or watermark. Use it for personal and commercial projects without an account.
What Is Compare PDF?
This PDF compare extracts the text layer from each document and diffs that text privately in your browser. It is not a full visual redline of layout, fonts, or scanned page images—see the limits section below before legal review.
When you need to spot changes quickly, a side-by-side diff beats manual scrolling. Paste content into both panels or upload text-based PDF documents, then review highlighted additions, deletions, and edits in one view.
Also known as a PDF diff tool, compare PDF files online, document difference checker, this page is built for developers, writers, analysts, and QA teams who need accurate diffs without installing desktop software. Processing runs locally in your browser whenever the format allows, which keeps sensitive data off third-party servers.
How to Use Compare PDF Online
- Open the tool — No registration is required.
- Add the original — Paste or upload the first version in the left panel. Supported inputs include text-based PDF documents.
- Add the modified version — Paste or upload the second version in the right panel.
- Choose options — Use the case, whitespace, formatting, key-order, or format-specific settings shown on this page when available.
- Review the diff — Inspect highlighted changes in the results area.
- Copy or export — Save the comparison output for tickets, pull requests, or audit logs.
Tip: If this page offers sample data, load it first to see how the comparison behaves before working with your own files.
What PDF Compare Does (and Does Not)
- Text layer — Compares extracted text from each PDF, not a pixel-perfect page image.
- Not a full visual redline — Layout shifts, font swaps, and watermark-only changes may not appear.
- Scanned PDFs — Image-only scans need OCR before text diff is useful.
- Privacy — Extraction and comparison run in your browser; documents are not uploaded to FileCompare servers.
Key Features of Compare PDF
- Side-by-side diff — Clear view of PDF text-layer differences between two documents with color-coded additions and deletions.
- Multiple input methods — Paste text, upload files, and swap panels where supported.
- Format-aware — Handles text-based PDF documents with sensible defaults.
- Privacy-first — Browser-side processing; no server upload for supported formats.
- Free and unlimited — No account, watermark, or export cap for normal use.
- Cross-platform — Works on Chrome, Firefox, Safari, and Edge on desktop and mobile.
- No installation — Web-based diff checker; open the page and compare immediately.
Zero Data Retention — Compare Securely in Your Browser
FileCompare.org runs supported comparisons in your browser: your files and pasted text stay on your device. Nothing is uploaded, stored, or logged on our servers for browser-side formats.
That matters when you diff contracts, API keys, customer data, or unreleased code. You get instant side-by-side results without sending content over the network.
Common Use Cases
Teams choose an online diff when they need PDF text-layer differences between two documents without a heavy IDE or desktop suite. Typical scenarios include:
- Contract revision review
- Legal document comparison
- Report version control
- Compliance audit trails
Because the tool is web-based, remote collaborators can share the same workflow from any location—useful for agencies, open-source maintainers, and distributed QA teams.
Tips for Best Results
Confirm you need text-layer comparison. Scanned PDFs need OCR; visual layout redlines are out of scope for this browser tool.
When a portal or pipeline rejects your file, compare its encoding, line endings, and size limits with your source, adjust settings, and run the diff again.
Bookmark this page for repeat jobs—controls stay visible between uploads, which speeds up daily review cycles.
Related Workflows
If you are checking contract revision review, legal document comparison, report version diff, this compare PDF page keeps the comparison focused on the relevant format and workflow. Use the related tools in the navigation when the input changes from text to structured data, lists, documents, or images.