PreventFile: Verifique PDFs

Projects Spiders

In-app purchases

About this app

Check PDFs and QR codes before opening.
PreventFile analyzes the file or code on your phone and shows, in simple language, if there is anything suspicious: scams, fake links, exposed passwords, and hidden instructions.

Secure PDF Checker
Send a PDF and see the verdict before opening, sharing, or sending it to an AI. The app looks for:
• Prompt injection: hidden instructions to manipulate AI assistants (in Portuguese and English)
• Exposed passwords and keys: tokens, API keys, and passwords, always masked in the report
• Dangerous commands: curl | sh, rm -rf, PowerShell, and similar
• Suspicious links: domains that mimic brands, link shorteners, IP addresses, and link text different from the destination
• Hidden content: white or invisible text, hidden Unicode characters, JavaScript, and embedded attachments

Secure QR code reader (against quishing)
Point the camera or choose a photo from the gallery. The link is never opened: the app only analyzes it.

• Pix (BR Code with CRC verification), links, Wi-Fi, SMS, contacts, cryptocurrencies, and app links
• Also finds QR codes within PDFs
• Highlights the real domain of the destination so you don't fall for similar addresses

Anti-scam tips
Clear guidance on SMS with fake links, calls requesting data, facial recognition scams, WhatsApp scams, and scams in ride-sharing apps, with the official channels of each service.

Easy-to-understand results
Verdict by category, verification history, and sharing of results in PDF, text, or Markdown.

Privacy first
PDF and QR code analysis is 100% local: your files and codes never leave the device. The internet is only used for login, credit balance, and purchases.

How Credits Work
• The verdict is free
• The full report (excerpts, pages, signals, and verifications) uses 1 credit
• You earn 3 welcome credits and +1 free credit per week while your balance is less than 3
• Optional credit packages can be purchased in the app (in-app purchase)
• Your account (email and password) holds your credit balance; you can delete your account anytime within the app

PreventFile: Verify PDFs and QR codes before opening and avoid scams.

What’s new

Primeira versão do PreventFile para Android!

Verifique PDFs e QR codes antes de abrir, direto no seu celular:

- Detecta instruções escondidas para manipular IAs (prompt injection)
- Encontra senhas, chaves e comandos perigosos expostos no PDF
- Alerta sobre links suspeitos, texto oculto, JavaScript e anexos
- Lê QR codes (Pix, links, Wi-Fi e mais) pela câmera ou galeria
- Dicas para não cair em golpes

A análise é feita 100% no aparelho: seus arquivos nunca saem dele.