Compare Documents Online
Online
Compare Text, PDF, Word, and Excel files online to find differences instantly.
Next-generation algorithms for character-by-character comparison.
Compare Documents Online
Upload or paste two documents to quickly spot differences.
Compare Now...
How Document Comparison Works
We combined powerful analysis algorithms with an intuitive interface for your productivity.
Step 1. Upload Files
Drag and drop your original and modified files into the upload areas.
Step 2. AI Parsing
The system algorithm extracts text and highlights all insertions and deletions.
Step 3. Analyze Differences
Review the intuitive side-by-side report where changes are clearly marked.
Why Choose AI Check?
We combined powerful analysis algorithms with an intuitive interface for your productivity.
Unmatched Accuracy
Our text-matching algorithm won't miss a single altered character or comma.
100% Privacy
We do not save your files. Everything is deleted right after the report is served.
No Registration
Start comparing documents immediately—completely free and without creating an account.
Frequently Asked Questions about document comparison
How to compare two documents for uniqueness?
Upload both documents into the input boxes. Our semantic text algorithm will render them into a Side-by-Side interface, pinpointing all insertions, modified parts, and deleted clauses for rapid proofreading.
What document formats are supported?
You can easily compare Microsoft Word documents (DOCX/DOC), PDF formats, Excel spreadsheets (XLSX, CSV), and unformatted plain text. You don't even have to pre-convert files in another software first.
Is it safe to use this online comparison tool?
Absolutely. Using our online document checker is totally safe. The architecture processes diffs natively in RAM. Your sensitive commercial files are neither stored on our disk drives nor viewed by any humans. They are wiped once you load the results.