PDF Diff

Visual document comparison that runs entirely on your machine—smart page alignment, highlighted inserts and deletes, zero cloud upload.

Download for Windows Privacy Policy

Mac Catalyst build in progress · Windows available on Microsoft Store

See it work

From drop zones to a highlighted diff PDF.

Built for SEC filings, financial statements, contracts, and compliance packs where pagination drifts and line-level truth matters.

Side-by-side PDF Diff result with red deletes and green inserts highlighted — Side-by-side result with inserts and deletes highlighted on financial line items.

PDF Diff empty New Diff screen — New Diff

Two PDFs selected with preview — PDFs selected

Job queue showing compare progress — Job queue

Why local

Embeddings on device. Documents never leave.

PDF Diff uses on-device embeddings for page alignment—no comparison API, no upload, no internet required for the core workflow. Privacy is the product, not a footnote.

Auto alignment with reading-order, semantic, and page-number strategies
Job queue with progress, cancel, and recent files
Configurable similarity threshold, highlight colors, and compression
Light, dark, and system themes

Legal teams

Track contract revisions without parking client PDFs in someone else’s cloud.

Finance & compliance

Compare quarterly packs and regulatory filings with visual certainty.

Auditors & analysts

Spot what changed between versions when pagination and layout refuse to cooperate.

Workflow

Four steps. One private machine.

Select left PDF

Picker, drag-and-drop, or recent files.

Select right PDF

Preview pages before you commit the compare.

Align & compare

Auto chooses the best alignment strategy for the pair.

Review & save

Inspect the highlighted diff PDF and export the result.

Your documents stay yours.

No cloud upload. No data collection. Compare on the machine that already holds the files.

No cloud upload No data collection No internet required

Download from Microsoft Store