Freedom251 › Document Comparison Software
DrawDiff
What DrawDiff is
DrawDiff compares engineering drawings, technical documents, and contracts by overlaying PDF pages in the browser. It handles multi-page documents in page order, while Find Differences identifies and numbers changed regions with links to jump to them. For drawings with shifted views, the Alignment Tool lets users select matching regions and reference points. Text Compare extracts and compares words in selected areas, and the app offers OCR when a scanned or image-based PDF has no text. Users can export pages as JPGs, package pages into a PDF, or copy selected regions to the clipboard. The maker says comparison takes place on the user's device and PDF files are not uploaded. After loading, the app can work offline; its single-file app can also be hosted on an internal web server for air-gapped environments. DrawDiff is free, requires no signup or installation, and runs in a modern browser. Settings include render scale from 0.5 to 8 and difference threshold from 0 to 128.
Who it suits
DrawDiff suits engineering, architecture, construction, legal, defense, and government users reviewing PDF drawings or documents. It may be useful where local processing, offline use after loading, or internal hosting matters.
What it does well
- Compares multi-page PDFs in order.
- Find Differences marks and links changed regions.
- Offers alignment for shifted drawing views.
- PDF comparison runs in the browser.
- Free with no signup or installation.
What to know first
- Requires a modern browser.
- Offline use requires the app to load first.
- Text comparison is limited to selected regions.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | no signup · no installation · browser use · PDF comparison | Free |
As drawdiff.com lists them, read 15 Oct 2026. The maker's own page has the final word.
Getting started
- Open https://drawdiff.com/ in a modern browser.
- Load the PDF documents you want to compare.
- Use the Alignment Tool if drawing views have shifted.
- Review page differences or compare text in selected regions.
- Export pages, package them into a PDF, or copy selected regions.
Verdict
DrawDiff provides several ways to inspect visual and text changes in PDFs, including alignment and OCR for image-based documents. Its browser-based workflow and offline option after loading are notable for teams handling sensitive files.
Questions
How much does DrawDiff cost?
DrawDiff has a free plan at no cost.
Does DrawDiff require signup or installation?
No. The Free plan requires no signup and no installation.
Which platform does DrawDiff support?
DrawDiff runs on the web in a modern browser.
Can it compare scanned PDFs?
Text Compare offers OCR when no text is found in a scanned or image-based PDF.
Are PDFs uploaded for comparison?
The maker says PDF comparison runs in the browser and files remain on the user's device.
Who made DrawDiff?
The site credits Tom Waldman.
Facts from DrawDiff's own pages
- 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, 15 Oct 2026
- Alignment
- The Alignment Tool lets users select matching regions and reference points to compare drawings whose views have shifted. · drawdiff.com, 7 Oct 2026
- Alignment tool
- Users can select matching regions and reference points so shifted views are aligned before comparison. · drawdiff.com, 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, 7 Oct 2026
- API status
- The defense page states that DrawDiff has no API endpoint or backend infrastructure for receiving files. · drawdiff.com, 15 Oct 2026
- Browser requirement
- The maker says DrawDiff runs in any modern browser and requires no installation or account. · drawdiff.com, 15 Oct 2026
- Company founded
- LinkedIn lists 2023 as the founding year. · in.linkedin.com, 15 Oct 2026
- Company headquarters
- LinkedIn lists the headquarters as Kota, Rajasthan, India. · in.linkedin.com, 15 Oct 2026
- Company industry
- LinkedIn categorizes DrawDiff as a marketing-services company. · in.linkedin.com, 15 Oct 2026
- Company ownership
- LinkedIn identifies the company as privately held. · in.linkedin.com, 15 Oct 2026
- Company size
- LinkedIn lists DrawDiff at 2–10 employees. · in.linkedin.com, 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, 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, 15 Oct 2026
- Development disclosure
- The same LinkedIn post says Claude assisted with coding, deployment, authentication and related work. · linkedin.com, 15 Oct 2026
- Difference detection
- Find Differences detects and numbers changed regions across pages, with links to jump to each change. · drawdiff.com, 7 Oct 2026
- Difference numbering
- Find Differences clusters changed pixels into numbered regions that users can navigate and export. · drawdiff.com, 15 Oct 2026
- Diff threshold
- The difference threshold ranges from 0 to 128, with 63 as the default. · drawdiff.com, 15 Oct 2026
- Email collection
- Optional email submissions are sent to Formspree for update notifications. · drawdiff.com, 15 Oct 2026
- Exports
- Results can be exported as individual JPG pages, a combined PDF, or copied regions. · drawdiff.com, 15 Oct 2026
- Independent praise: privacy
- A Reddit engineering discussion describes DrawDiff as free, browser-based, installation-free and locally processed for proprietary drawings. · reddit.com, 15 Oct 2026
- Integrations
- No product integrations, SDKs or developer documentation are described on the maker's pages. · drawdiff.com, 15 Oct 2026
- Intended users
- The site names engineering drawing reviewers, architecture and construction teams, legal and contract reviewers, and defense and government users. · drawdiff.com, 7 Oct 2026
- Licence
- The terms prohibit copying, redistribution, resale, reverse engineering and derivative works, and reserve all rights to Tom Waldman. · drawdiff.com, 15 Oct 2026
- Limit: initial connectivity
- Offline use starts only after the application and its assets have loaded. · drawdiff.com, 15 Oct 2026
Where DrawDiff stands on Freedom251
- Document Comparison Software#10 of 25