DoorHandle — Trust & Document Verification Toolkit

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DoorHandle — Trust & Document Verification Toolkit

Run image/PDF integrity checks, spot tampering signals, compare seals/marks, and estimate rental scam risk with country-aware guidance — all in your browser.

Offline-first

Image Integrity Check (EXIF/Metadata + ELA)

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Original preview

ELA result

Tip: ELA highlights compression inconsistencies. A “high” signal does not prove forgery; it flags areas to inspect more closely.

Physical Tamper Signals (cut/paste, re-photograph, print-scan)

Edge density map

Texture variance map

These are heuristic visual maps. Bright areas can indicate seams, abnormal texture patches, or repeated blocks — but real documents can also produce strong edges.

Landlord / Payee Consistency Check (user-entered comparison)

No original authorization letter verified Original authorization letter verified

Seal/signature match: unknown Seal/signature: matches owner Mismatch / unclear

This does not query external databases. It flags mismatches between values you already verified from official sources.

Seal / Mark Comparison (two images)

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Document

Reference

Use a trustworthy sample from the same organization. Similarity is a signal, not proof.

PDF Integrity Check (metadata + text fingerprint)

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The fingerprint is computed from extracted text (page 1). Different extraction engines may produce different text orderings.

Document Format / Privacy Check (rules-based)

This is a rules-based check. Always verify original issuance, contact the issuer, and consider professional review.

Rental Scam Risk Estimator (country-aware)

Global (general) United States United Kingdom Canada Australia Singapore Japan South Korea Germany France Standard lease Sublet / room rental Short-term / serviced

Bank transfer (to verified account) Platform escrow / verified payment Cash Crypto / gift cards / unusual In-person viewing completed Live video tour (real-time) No real viewing Price seems normal Slightly too good Unrealistically cheap

Landlord identity verified Partially verified Not verified Address/ownership checked via official source Checked informally (maps/listing only) Not checked No pressure tactics Some urgency High-pressure / threats / rush

This is a generalized estimator. Tenant law varies by jurisdiction. Treat the output as a prompt for verification steps, not a legal conclusion.

Professional Review Guide (copy-ready)

Bring these items: lease/contract draft, property address details, proof of ownership (official registry extract where available), landlord/agent ID details, payment instructions, listing screenshots, any authorization letter (if dealing with an agent), and communication logs. Questions to ask: Is the owner/landlord identity consistent across official sources and the contract? Are agent documents valid and current? Are there liens/encumbrances that affect tenancy (where applicable)? What are the required disclosures and tenant protections in this jurisdiction? Are deposit limits and required receipts compliant? What is the safest payment method and proof set to keep? Key review points: ownership verification, agent authority, unusually large upfront requests, mismatched payee names, refusal to allow viewing, pressure tactics, unclear cancellation terms, missing signatures, missing address/unit identifiers, and privacy over-collection. Ask for: a written checklist summary or a short written opinion for your records.

Required Disclaimer & Copyright

1) This toolkit is for first-pass reference only and is not legal advice, official appraisal, or a substitute for professional review.

2) Image/PDF signals and seal comparison provide technical indicators only. Regardless of results, verify originals, contact issuers, and consider formal inspection.

3) Rental risk estimation uses a simplified scoring guide. Always perform real verification (identity/ownership, safe payment, receipts, disclosures, tenant protections) before committing.

4) The author is not responsible for losses or disputes arising from use of this tool.

5) No redistribution. Unauthorized copying, distribution, modification, or commercial use is prohibited.

© 2026 Happycode7. All rights reserved.

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