Compare documents
Upload 2–8 PDFs of the same kind. DockDocs reads them in your browser, then lines up the key terms side by side — with the source line shown wherever it can be located.
Drag & drop PDFs here
Read locally — your files never leave your device. Field extraction runs on our server.
Coming next
- · A recommendation backed by the compared numbers (which option wins, and why)
- · Click any value to jump to the exact spot in the original PDF
- · Add your own dimensions to compare
// Benefits
Why compare documents with DockDocs
Line up two PDFs side by side, ask questions that span both, and get a verdict drawn from those numbers — the AI reads the documents' text for you.
Key terms lined up side by side
The AI pulls vendor, price, dates, and terms from each PDF into one table, so the differences between two documents jump out instead of hiding across pages.
Answers point back to the source line
When you ask a question across both documents and the answer draws on a specific line, it's shown with that source line — and the server verifies that snippet really appears in the named document before showing it.
A verdict you can check
Get a recommendation on which option wins and why, with each underlying figure traceable to the table — so you can confirm the numbers before you decide.
// Workflow
How comparing fits your document work
For the moment two versions, two quotes, or two contracts need to be weighed against each other without re-reading both end to end.
- 1
Upload the two PDFs you want to compare.
- 2
The document's text is analyzed by AI to align fields, answer cross-document questions, or recommend a winner.
- 3
Review the side-by-side table, ask a question, or read the data-backed verdict.
// Recommended reading
More AI document tools
Related ways to read, check, and pull facts out of your PDFs.
Contract risk review
Flag risky clauses in a single contract, each quoted risk tied to its source line.
Continue ->Government bid matrix
Turn a tender document into a structured requirements matrix you can act on.
Continue ->Extract to Excel
Pull tables and fields out of a PDF into a clean spreadsheet.
Continue ->Compare documents — FAQ
How do I compare documents?
Upload 2 to 8 PDFs of the same kind — quotes, invoices, or contracts — then pick the type and click "Compare fields". DockDocs lines up the key terms (price, delivery, payment, warranty, and so on) side by side in one table, showing the exact source line behind each value wherever it can locate one (and "Not recognized" when a document doesn't state it, never a guess). You also get a recommendation backed by those compared numbers for which option wins, and you can ask one question across all the documents at once.
Are my files uploaded to your server?
No — your PDFs never leave your device. DockDocs reads them right in your browser to pull out the text. Only that extracted plain text (not the file itself) is sent to our server, where the AI extracts and aligns the fields. So the document, its layout, and any embedded data stay local; what travels is the words on the page.
Why does my PDF say "Not recognized (likely scanned — needs OCR)"?
That means the PDF has no selectable text layer — it's usually a scan or a photo of a page, so there's nothing to read. Click "Extract text with OCR" on that document and DockDocs will run OCR in your browser to recognize the text (the first few pages), then you can compare it like any other file. Encrypted or password-protected PDFs also can't be read until they're unlocked.
What do I get back, and can I trust the values?
You get a comparison table where every cell shows the value plus the exact source line it came from — and that line is verified to actually appear in your document, so nothing is invented. Click any source line to jump to a highlighted snippet of the original text. If a document simply doesn't state something, you'll see "Not recognized" rather than a guess. One caveat: the overall recommendation is the AI's reasoning over those numbers and isn't individually source-checked, so confirm the figures in the table before you decide.
Is there a limit on file count or size?
You can compare up to 8 PDFs at a time, and you need at least 2 readable ones for the comparison to run. For the "ask across documents" feature, the combined text of all documents must stay under 60,000 characters and your question under 500 characters — if you hit that, use fewer or shorter documents. The tool needs an internet connection, since the field extraction and recommendation run on our server.
Is it free?
Yes — you can upload your PDFs, run the side-by-side comparison, get the recommendation, and ask questions across your documents. The in-browser OCR for scanned files is free too, since it runs locally on your device.