PdfCompare.app
PdfCompare.app is a free web app for comparing two PDF versions, showing text revisions and visual differences.
What PdfCompare.app is
PdfCompare.app is a free web app for comparing two PDF versions, showing text revisions and visual differences. Users can switch among Doc View, Redline, and Pixel Overlay modes. Its WebAssembly engine examines paragraphs, sentences, and numerical values for text changes, while Pixel Overlay is designed to reveal layout shifts such as moved stamps or logos. Timestamped difference reports can be exported for compliance sign-off. The maker says processing takes place in local browser memory and document bytes are not uploaded to its servers. Its privacy policy says the CDN may log limited technical metadata, including device type and routing details, but not document payloads. The app can work offline after its WebAssembly assets have been loaded and cached. The maker states there are no page-count or file-size ceilings, though processing is bounded by available device RAM. Some scanned PDFs with non-standard CMYK profiles or heavy password protection may need decryption or comparison in Text Redline mode. The free plan costs nothing, requires no account, and lists no daily file limits, page limits, file-size ceilings, or watermarks.
Good
- Doc View, Redline, and Pixel Overlay comparison modes
- Exports timestamped difference reports
- No account required on the free plan
- Can work offline after assets are cached
Watch out
- Processing is bounded by available device RAM
- Some scanned PDFs may need decryption
- Certain scanned PDFs may require Text Redline mode
Who it suits
PdfCompare.app may suit legal, finance, design, engineering, HR, and operations teams comparing document revisions or layout changes. It is also relevant to users who need browser-based comparison and timestamped difference reports.
Verdict
PdfCompare.app provides both text and visual comparison, with exportable difference reports and local-browser processing as described by its maker. Users with scanned PDFs should note the stated CMYK-profile and password-protection limitations.
Plans and prices
From PdfCompare.app's own pricing page, checked 7 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | No account required · no daily file limits · no page limits · no file size ceilings · no watermarks |
The facts
Each one read from PdfCompare.app's own pages, with the date it was checked.
What it does
- Audit reports
- Users can export timestamped difference reports for compliance sign-off.checked 7 Oct 2026
- Comparison views
- The interface offers Doc View, Redline, and Pixel Overlay modes.checked 7 Oct 2026
- Compatibility limitation
- Some scanned PDFs with non-standard CMYK profiles or heavy password protection may need to be decrypted or compared in Text Redline mode.checked 7 Oct 2026
- Compliance claims
- The maker describes the service as GDPR and CCPA compliant and says its zero-custody design can suit organizations handling HIPAA-regulated documents.checked 7 Oct 2026
- Enterprise options
- The maker offers custom air-gapped Docker deployments, white-label packaging, and corporate SLAs by inquiry.checked 7 Oct 2026
- File limits
- The maker states there are no page-count or file-size ceilings, with processing bounded by the device's available RAM.checked 7 Oct 2026
- Intended users
- The maker describes workflows for legal, finance, design, engineering, HR, and operations teams.checked 7 Oct 2026
- Offline use
- The maker says the app can continue working offline after it has loaded and cached its WebAssembly assets.checked 7 Oct 2026
- Privacy
- The maker says PDF processing happens in local browser memory and document bytes are not uploaded to its servers.checked 7 Oct 2026
- Privacy telemetry
- The privacy policy says its CDN may log limited technical metadata, such as device type and routing details, but not document payloads.checked 7 Oct 2026
- Purpose
- PdfCompare compares two PDF versions side by side, including text revisions and visual changes.checked 7 Oct 2026
- Support
- The support page lists response targets of under four hours for critical security reports, under 24 hours for rendering bugs, and one to two business days for feature suggestions.checked 7 Oct 2026
- Text comparison
- Its WebAssembly engine tokenizes paragraphs, sentences, and numerical values to identify changes.checked 7 Oct 2026
- Visual comparison
- Pixel overlay is designed to reveal shifted stamps, logos, and other layout changes.checked 7 Oct 2026
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