# Detect tampered and deepfake Invitation Letter > A forged invitation letter is usually exposed by the host rather than the paper. The named host turns out not to live at the address given, the company on the letterhead has no registration behind it, or the same scanned signature appears on letters from three unrelated hosts. Nothing about the layout gives it away, because an invitation letter has no official format and no issuing authority - it is whatever the host typed. TamperCheck works on the file instead, and marks the fields that were added later. **Canonical URL:** https://tampercheck.ai/documents-support/invitation_letter **API document class:** `invitation_letter` **Last updated:** 2026-10-07 --- ## What a genuine invitation letter contains An invitation letter names two people and one visit. The host gives their full name, residential or business address, telephone number and email, their own nationality or residence status, and their relationship to the applicant. The applicant appears with passport number, date of birth and nationality. The body states the dates of the visit, where the visitor will sleep, the purpose in plain terms - a wedding, a trade fair, a family stay - and who pays for what. It closes with the place and date of writing and a handwritten signature. Business invitations add letterhead, a company registration number and the signatory's job title. Those fields are only worth anything because other documents in the bundle repeat them. The visit dates have to sit inside the flight itinerary and the accommodation booking, and inside the period the travel insurance covers. If the host says the visitor will stay at their home, the address in the letter and the address on the host accommodation form are the same address, and no hotel reservation should be doing the same job. If the host promises to cover costs, the financial evidence has to show the money. A letter edited in one place starts arguing with the rest of the file. ## How invitation letter forgeries are made ### Host block substitution One genuine letter is resold with the host details swapped out. Name, address and telephone number change while the body text, margins and signature stay exactly where they were. The replaced lines sit on a slightly different baseline from the paragraph around them and carry a compression history of their own. ### Visit window stretched Arrival and departure dates are widened after the host has signed, so the letter covers a longer stay than the host agreed to. Two numbers change on an otherwise authentic page, and the new dates usually fall outside the period the accommodation booking and the insurance policy cover. ### Letterhead transplant A company logo and header are lifted from a brochure or an unrelated PDF the firm has published, then pasted above a letter nobody at that company wrote. The transplanted header keeps the resolution and colour profile of its source, which differs from the text rendered beneath it. ### Reused signature graphic The same signature image is pasted onto letter after letter. A pen signature varies in pressure and bleeds into the fibre of the paper; a pasted one is a clean raster with hard edges, identical pixel for pixel to the copy used on someone else's application last month. ### Fabricated registration stamp A round company or residents' registration stamp is drawn or copied in to make a private letter look official. Real rubber stamps print unevenly, skip where the pad was dry and overlay the text beneath them. A synthetic stamp has uniform opacity and no interaction with the ink it sits on. ### Letters written to order Generated from a prompt or a web form, complete with a plausible host, an address and a purpose. Nothing inside contradicts anything else, so a consistency review passes them. What identifies these is the generation itself: the noise and compression profile of a synthesised page differ from one that was printed, signed and scanned. ## What TamperCheck checks on an invitation letter TamperCheck runs 200+ forensic checks across three layers and returns a risk score from 0 to 100 with plain-English findings tied to specific regions of the document. These three carry the most weight on this document class. ### Signature forgery analysis Signature regions are assessed for ink consistency and for how the stroke sits on the page, which distinguishes a genuine pen stroke from a pasted image of one. ### Letterhead, logo, and issuer plausibility Issuer branding is checked for resolution and compression consistency against the body text it sits on. A logo lifted from a website carries the signature of its source, not of the document. ### Date and validity consistency Issue, expiry, and period dates are checked against one another and against the file's own creation metadata, which catches backdating and validity extension. ### And many more checks The three above are the layers that carry the most weight on an invitation letter. Every upload runs the full suite of 200+ checks regardless of document class, spanning file structure and metadata, pixel-level forensics, font and text rendering, optical and print characteristics, provenance signals, AI-generation signatures, and many more checks. ## Who verifies an invitation letter, and why Consulates and visa centres validating the purpose of travel. In each case the document is being used to unlock money, access, or a legal status, which is exactly what makes it worth forging. ## How to verify an invitation letter in 4 steps 1. **Check the fields against each other.** Read host identity, visit dates and purpose, and host signature together rather than one at a time. Forgers typically change one value and leave the rest of the document describing the original. 2. **Inspect the file metadata.** Open the document properties and look at the producer, creation date, and modification date. A document produced by a consumer PDF editor, or created long after the date printed on its face, is worth a closer look. 3. **Ask for a second document.** Request a corroborating document from the same issuer or an adjacent period. Forgery effort concentrates on one file, so inconsistencies surface as soon as there are two to compare. 4. **Run a forensic check.** Manual review catches obvious edits but not field-level pixel manipulation or synthetic generation. TamperCheck runs 200+ forensic checks on an invitation letter and returns a risk score from 0 to 100 within seconds, at $0.50 per document. ## Frequently asked questions ### How do consulates verify invitation letters? They verify the host, not the paper. Consulates call or write to the contact details on the letter and ask the host to confirm the visit, check a company host against the national commercial register, and read the letter against the rest of the bundle for agreement on dates, address and who is paying. A letter nobody answers for is treated as no letter at all. ### Can an invitation letter be faked for a visa? Yes, and it is the simplest document in a Schengen bundle to fake, because no authority issues it and there is no correct format to deviate from. Anyone can type one. That is why consulates weigh it lightly on its own and heavily against everything filed with it, and why finding an edit matters: an edit shows intent rather than error. ### What does a consulate look for in an invitation letter? Agreement with the rest of the application, first. The host's address should be the address the visitor declares, the dates should match the tickets and the accommodation, the purpose should be specific rather than a general welcome, and any promise to cover costs should be supported by financial evidence. Contact details that work matter more than a polished layout. ### Can software detect an edited invitation letter? Yes. TamperCheck runs 200+ forensic checks over the letter and returns a risk score from 0 to 100 within seconds, with findings tied to the region that changed: the host block, a date line, a pasted signature or stamp. It analyses the file it is given rather than any register, so it answers whether the document was altered, not whether the host is real. ## Related document types - Sponsor Letter: https://tampercheck.ai/documents-support/sponsor_letter - Travel Itinerary: https://tampercheck.ai/documents-support/travel_itinerary - Travel Agency Booking: https://tampercheck.ai/documents-support/travel_agency_booking - Accommodation Booking: https://tampercheck.ai/documents-support/accommodation_booking - Host Accommodation Form: https://tampercheck.ai/documents-support/host_accommodation_form - Boarding Pass: https://tampercheck.ai/documents-support/boarding_pass --- Try TamperCheck now: https://tampercheck.ai/dashboard · Docs: https://tampercheck.ai/docs · Pricing: https://tampercheck.ai/pricing