DrawDiff

Spec sheet

What it does

DrawDiff compares engineering drawings, technical documents, contracts and other PDF revisions with pixel-level, color-coded overlays.Read 15 Oct 2026 · drawdiff.com

Purpose

DrawDiff compares engineering drawings, technical documents, and contracts using pixel-accurate PDF overlays.Read 7 Oct 2026 · drawdiff.com

Intended users

The site names engineering drawing reviewers, architecture and construction teams, legal and contract reviewers, and defense and government users.Read 7 Oct 2026 · drawdiff.com

Integrations

No product integrations, SDKs or developer documentation are described on the maker's pages.Read 15 Oct 2026 · drawdiff.com

Support

The privacy policy directs questions to [email protected].Read 15 Oct 2026 · drawdiff.com

Maker

The site credits Tom Waldman; the pages opened do not state a headquarters or founding year.Read 7 Oct 2026 · drawdiff.com

Air-gapped deployment

The maker says the single self-contained HTML application can be hosted on an internal server or file system for fully air-gapped use.Read 15 Oct 2026 · drawdiff.com

Alignment

The Alignment Tool lets users select matching regions and reference points to compare drawings whose views have shifted.Read 7 Oct 2026 · drawdiff.com

Alignment tool

Users can select matching regions and reference points so shifted views are aligned before comparison.Read 15 Oct 2026 · drawdiff.com

Analytics

The privacy policy says DrawDiff uses Google Analytics 4 for anonymous usage data, including visited pages, general region, device category, and feature events; it says this data excludes PDF content and filenames.Read 7 Oct 2026 · drawdiff.com

API status

The defense page states that DrawDiff has no API endpoint or backend infrastructure for receiving files.Read 15 Oct 2026 · drawdiff.com

Browser requirement

The maker says DrawDiff runs in any modern browser and requires no installation or account.Read 15 Oct 2026 · drawdiff.com

Company founded

LinkedIn lists 2023 as the founding year.Read 15 Oct 2026 · in.linkedin.com

Company headquarters

LinkedIn lists the headquarters as Kota, Rajasthan, India.Read 15 Oct 2026 · in.linkedin.com

Company industry

LinkedIn categorizes DrawDiff as a marketing-services company.Read 15 Oct 2026 · in.linkedin.com

Company ownership

LinkedIn identifies the company as privately held.Read 15 Oct 2026 · in.linkedin.com

Company size

LinkedIn lists DrawDiff at 2–10 employees.Read 15 Oct 2026 · in.linkedin.com

Comparison settings

The app provides a render-scale setting from 0.5 to 8 and a difference-threshold setting from 0 to 128.Read 7 Oct 2026 · drawdiff.com

Compliance position

The maker makes no compliance certifications and says users remain responsible for ITAR, EAR, GDPR and organizational compliance.Read 15 Oct 2026 · drawdiff.com

Development disclosure

The same LinkedIn post says Claude assisted with coding, deployment, authentication and related work.Read 15 Oct 2026 · linkedin.com

Diff threshold

The difference threshold ranges from 0 to 128, with 63 as the default.Read 15 Oct 2026 · drawdiff.com

Difference detection

Find Differences detects and numbers changed regions across pages, with links to jump to each change.Read 7 Oct 2026 · drawdiff.com

Difference numbering

Find Differences clusters changed pixels into numbered regions that users can navigate and export.Read 15 Oct 2026 · drawdiff.com

Email collection

Optional email submissions are sent to Formspree for update notifications.Read 15 Oct 2026 · drawdiff.com

Exports

Results can be exported as individual JPG pages, a combined PDF, or copied regions.Read 15 Oct 2026 · drawdiff.com

Independent praise: privacy

A Reddit engineering discussion describes DrawDiff as free, browser-based, installation-free and locally processed for proprietary drawings.Read 15 Oct 2026 · reddit.com

Licence

The terms prohibit copying, redistribution, resale, reverse engineering and derivative works, and reserve all rights to Tom Waldman.Read 15 Oct 2026 · drawdiff.com

Limit: initial connectivity

Offline use starts only after the application and its assets have loaded.Read 15 Oct 2026 · drawdiff.com

Limit: text extraction

The contract page says Text Compare requires selectable PDF text; scanned image-only PDFs show visual differences but return no extracted text, with OCR described there as planned.Read 15 Oct 2026 · drawdiff.com

Limit: warranties

The terms provide the service as-is and disclaim guarantees that it will be error-free, uninterrupted or fit for a particular purpose.Read 15 Oct 2026 · drawdiff.com

Local processing

PDF data is read through the browser File API and processed in browser memory without document uploads.Read 15 Oct 2026 · drawdiff.com

Multi-page PDFs

It compares multi-page documents page by page, in order.Read 7 Oct 2026 · drawdiff.com

Multi-page support

Multi-page PDFs are compared page by page in order.Read 15 Oct 2026 · drawdiff.com

Notable news: launch mention

A LinkedIn post dated in the page's activity describes Tom Waldman's son building DrawDiff to solve engineering drawing revision comparison.Read 15 Oct 2026 · linkedin.com

OCR

The application exposes an OCR option when a selected PDF region has no extractable text, with an approximately 15 MB first-use download.Read 15 Oct 2026 · drawdiff.com

Offline mode

After the application has loaded, it can continue operating with the internet disconnected.Read 15 Oct 2026 · drawdiff.com

Offline use

The security page says the app can work offline after it has loaded and that the single-file app can be hosted on an internal web server for air-gapped environments.Read 7 Oct 2026 · drawdiff.com

Pixel overlay

The tool compares rendered PDF pixels at a configurable scale to expose additions, removals and unchanged content.Read 15 Oct 2026 · drawdiff.com

Praise: workflow fit

A LinkedIn post calls the tool a game changer for people who spend hours comparing technical drawing revisions.Read 15 Oct 2026 · linkedin.com

Region inspector

Ctrl-drag opens a three-panel overlay, original and revised view that can be copied or saved as JPG.Read 15 Oct 2026 · drawdiff.com

Render scale

Render scale ranges from 0.5× to 8×, with 4× (288 DPI) as the default; higher values use more processing time and memory.Read 15 Oct 2026 · drawdiff.com

Scale compensation

The alignment workflow can compensate for views drawn at different scales and reads written scale annotations.Read 15 Oct 2026 · drawdiff.com

Telemetry

Google Analytics 4 collects aggregated page, device-region and feature-event data, excluding PDF content and filenames.Read 15 Oct 2026 · drawdiff.com

Text comparison

A selected PDF region can be extracted and compared at word level, with added and removed words color-coded.Read 15 Oct 2026 · drawdiff.com

Plans and prices

Every DrawDiff plan and price →

Where Specifiction places it

• Document Comparison Software#7 of 258.4