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DrawDiff
What it is
DrawDiff is a browser-based tool for comparing engineering drawings, technical documents, and contracts through pixel-accurate PDF overlays. It compares multi-page files page by page and in order. Find Differences marks and numbers changed regions, with links for moving between them. The Alignment Tool lets users choose matching regions and reference points when drawing views have shifted. Text Compare extracts and compares words in selected areas, and OCR is available when scanned or image PDFs contain no text. Pages can be exported as JPGs, combined into a PDF, or copied as selected regions. The maker says PDF processing happens in the browser and files remain on the device rather than being uploaded. After loading, the app can work offline, and its single-file app can be hosted internally for air-gapped environments. DrawDiff is free, needs no signup or installation, and runs in a modern browser. Render scale ranges from 0.5 to 8; difference threshold ranges from 0 to 128.
For and against
For
- Pixel-accurate PDF overlays
- Page-by-page multi-page comparison
- OCR for image-based PDFs
- Offline and air-gapped options
- No signup or installation
Against
- Runs only in a web browser
- No free trial is offered
- Google Analytics collects anonymous usage data
The verdict
DrawDiff focuses on visual and text differences in technical PDFs, with alignment, OCR, exports, and local processing. Its free browser delivery and offline hosting options may fit review teams with strict file-handling requirements.
Who it suits
DrawDiff suits engineering, architecture, construction, legal, contract, defense, and government reviewers comparing PDF revisions. It is also suited to teams needing local or air-gapped browser use.
Plans and prices
Free
no signup · no installation · browser use · PDF comparison
Read 15 Oct 2026 · drawdiff.com
On the record
- 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.drawdiff.com · read 15 Oct 2026
- Alignment
- The Alignment Tool lets users select matching regions and reference points to compare drawings whose views have shifted.drawdiff.com · read 7 Oct 2026
- Alignment tool
- Users can select matching regions and reference points so shifted views are aligned before comparison.drawdiff.com · read 15 Oct 2026
- 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.drawdiff.com · read 7 Oct 2026
- API status
- The defense page states that DrawDiff has no API endpoint or backend infrastructure for receiving files.drawdiff.com · read 15 Oct 2026
- Browser requirement
- The maker says DrawDiff runs in any modern browser and requires no installation or account.drawdiff.com · read 15 Oct 2026
- Company founded
- LinkedIn lists 2023 as the founding year.in.linkedin.com · read 15 Oct 2026
- Company headquarters
- LinkedIn lists the headquarters as Kota, Rajasthan, India.in.linkedin.com · read 15 Oct 2026
- Company industry
- LinkedIn categorizes DrawDiff as a marketing-services company.in.linkedin.com · read 15 Oct 2026
- Company ownership
- LinkedIn identifies the company as privately held.in.linkedin.com · read 15 Oct 2026
- Company size
- LinkedIn lists DrawDiff at 2–10 employees.in.linkedin.com · read 15 Oct 2026
- Comparison settings
- The app provides a render-scale setting from 0.5 to 8 and a difference-threshold setting from 0 to 128.drawdiff.com · read 7 Oct 2026
- Compliance position
- The maker makes no compliance certifications and says users remain responsible for ITAR, EAR, GDPR and organizational compliance.drawdiff.com · read 15 Oct 2026
- Development disclosure
- The same LinkedIn post says Claude assisted with coding, deployment, authentication and related work.linkedin.com · read 15 Oct 2026
- Difference detection
- Find Differences detects and numbers changed regions across pages, with links to jump to each change.drawdiff.com · read 7 Oct 2026
- Difference numbering
- Find Differences clusters changed pixels into numbered regions that users can navigate and export.drawdiff.com · read 15 Oct 2026
- Diff threshold
- The difference threshold ranges from 0 to 128, with 63 as the default.drawdiff.com · read 15 Oct 2026
- Email collection
- Optional email submissions are sent to Formspree for update notifications.drawdiff.com · read 15 Oct 2026
