PDF Drawing Comparison for Defense and Aerospace

Most PDF comparison tools upload your files to a cloud server. For defense, aerospace, and other controlled-environment work, that is not an option. DrawDiff performs the entire comparison inside your browser — nothing is ever transmitted.

    Technical guarantee, not just a promise. DrawDiff is a static website. It has no server, no API endpoint, and no infrastructure capable of receiving your files. The comparison engine runs entirely in JavaScript within your browser tab. Verify this yourself by running DrawDiff with your network connection disabled after the page loads.
  

Why Standard Comparison Tools Are a Problem

Tools like Draftable, Smallpdf, Adobe Acrobat web, and most online PDF services operate by uploading your documents to their servers for processing. For documents subject to export control regulations, proprietary design restrictions, or classification requirements, this creates unacceptable risk:

ITAR-controlled technical data cannot be transmitted to foreign servers or unvetted cloud infrastructure
Proprietary design drawings may be subject to NDA or trade secret protections
Classified or Controlled Unclassified Information (CUI) has specific handling requirements
Corporate IT policy may prohibit uploading engineering documents to third-party services

How DrawDiff Is Different

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No Upload

Files are read from your device by the browser's File API and never transmitted over any network connection

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No Server

DrawDiff has no backend. The hosting is static file delivery only — no computation happens server-side

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Works Offline

Once the page is loaded, disconnect from the network. DrawDiff continues to function fully for as long as the tab is open

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No Account

No login, no registration, no identity collection. There is nothing to link a user to their activity

Suitable Use Cases

Defense contractor drawing review — compare supplier drawings against government specifications or previous submissions
Aerospace component drawings — verify revision changes on controlled manufacturing drawings
Naval architecture and marine — compare classification society drawings or survey documents
Nuclear and critical infrastructure — compare safety-significant drawings in environments with strict document controls
Government contract deliverables — review changes in technical data packages (TDPs) and CDRLs

Air-Gapped and Restricted Network Environments

DrawDiff can be used on machines with restricted internet access. After the initial page load (which fetches the JavaScript and fonts from the CDN), the application runs entirely locally. For fully air-gapped environments, the HTML file can be saved locally and served from an internal server or file system — contact us if you need guidance on this approach.

What Data DrawDiff Does Collect

DrawDiff uses Google Analytics to collect anonymous, aggregate usage statistics — which pages are visited, which features are used, and approximate geographic region. No document content, filenames, or personally identifiable information is collected. GA uses cookies that can be blocked by standard enterprise browser policies. See the Privacy Policy for full details.

Compliance notice: DrawDiff's local-processing architecture supports compliant use with many document handling requirements, but users are solely responsible for ensuring their use complies with applicable regulations including ITAR, EAR, GDPR, and organisational policies. DrawDiff makes no compliance certifications or guarantees. See Terms of Use.

No upload. No account. No risk. Compare your drawings now.

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