PdfCompare

Compare PDF files side-by-side with 100% private WebAssembly.

by Myriam Metz

Visit

Sep 10, 2026 Productivity

client_side document comparison pdf privacy webassembly

Gallery

About

What is PdfCompare?PdfCompare is an open-standard, zero-cloud PDF comparison tool built for attorneys, financial auditors, designers, and enterprise professionals.Key Features:100% Client-Side Privacy: All file parsing and differential algorithms execute entirely inside your browser's WebAssembly memory. Zero files are uploaded to remote servers.Word-Level Redline Precision: Highlights inserted text in vibrant emerald green and deleted phrases in red strike-through, filtering out distracting format noise.Visual Pixel Overlay: High-DPI canvas overlay with a draggable slider to detect shifted stamps, relocated signatures, and altered drawing margins.No Account Required: Instant zero-click comparison with no signups, no paywalled page limits, and no exported watermarks.Audit Changelog Export: Export verified timestamped diff logs for legal compliance records with 1 click.