Byte-identical files
A SHA-256 digest identifies files with identical bytes even when names or folders differ.
A product by Kastovia Holdings LLC · Chrome
PDF Duplicate ReviewFind duplicate PDF files locally.
Use a local PDF duplicate checker for Chrome to compare byte-identical files (SHA-256) or matching extracted page text across a batch. Your PDFs stay on your device, the originals remain unchanged, and you can export a CSV review report.
Free for batches of up to 10 PDFs. Buy Pro for batches of up to 250, then paste the emailed license key into the extension.Runs on your deviceReview flow / 01
01SelectYour chosen PDFs
02ReadBytes + page text
03GroupReview candidates
04ExportCSV report
Illustrative workflow. The extension reports candidates and never deletes source files.
10PDFs per free batch
250PDFs per Pro batch
LocalPDF processing
Read-onlysource files untouched
Two signals, kept clearly separate.
The extension distinguishes exact copies from documents that only share extracted text. That boundary matters when the review supports records work, discovery, or a large document cleanup.
Matching extracted page text
Page count and normalized text match page by page. Images, signatures, annotations, form values, and layout may still differ.
Clear CSV output
Export grouped results, skipped files, errors, and the basis for each candidate group.
Your document contents stay on your device.
PDF content, extracted text, filenames, paths, and hashes are processed inside the extension and are not uploaded. The extension keeps a batch in memory while it is open and creates CSV reports locally.
What the product does not do
Read the product privacy policy ↗- It does not delete, rename, or rewrite source PDFs.
- It does not perform OCR or image comparison.
- It does not treat a text match as proof of visual equivalence.
- It does not send PDF data with a license check.
Plans
Start free. Upgrade only for larger batches.
Install the free Chrome extension first. Buy Pro for version 1 at EUR 49 once, tax included, then paste the emailed license key into the extension.
Up to 10 PDFs
Byte-identical and extracted-text checks, CSV reporting, and no account requirement.
Up to 250 PDFs
EUR 49 once, tax included, with no recurring fee for version 1.
Bounded processing
20 MiB per PDF, 200 MiB per batch, 500 pages per PDF, 20 seconds per file, and 5,000,000 extracted characters per PDF.
Three active installations
A license has no expiry and supports three browser installations. Pro batches require online verification; if verification is unavailable, the free 10-file limit applies.
PDF duplicate checker FAQ
Review candidates, not automatic deletion decisions.
Does PDF Duplicate Review upload my PDFs?
No. Selected PDFs are read inside the extension and remain on your device.
How does the PDF duplicate checker find matches?
It keeps two signals separate: SHA-256 identifies byte-identical files, while normalized extracted text identifies page-by-page review candidates.
Does PDF Duplicate Review delete duplicate files?
No. It reports review candidates and leaves every source PDF unchanged.
Can it find duplicates in scanned PDFs?
It reports PDFs with no extractable text for attention. OCR and image comparison are not included.
How much does PDF Duplicate Review cost?
The free plan compares up to 10 PDFs per batch. Pro for version 1 costs EUR 49 once, tax included, and compares up to 250 PDFs per batch on as many as three active browser installations.