PDF Signature Maker is an Android app for adding a visual, hand-drawn signature to PDF documents. The user picks a PDF from their device (up to 100 MB / 100 pages), draws a signature with their finger on a signature pad (choice of 3 ink colors and 3 stroke widths), places/resizes/duplicates the signature anywhere on any page, and exports the signed PDF to download or share. All PDF processing happens entirely on the device in the app's embedded web view (pdf.js for rendering, pdf-lib for embedding) — documents and signatures are NEVER uploaded to any server. Up to 6 signatures can be saved locally on the device (IndexedDB) for reuse; they can be deleted by the user at any time. The signature is a visual image stamp only — this is NOT a qualified/certified electronic signature (no cryptographic signing, no identity verification). Monetization: free tier exports a watermarked, resolution-reduced copy (up to 4 pages / 20 MB files); a weekly auto-renewing subscription "Premium" ($1.99/week via Google Play Billing) unlocks watermark-free export at original PDF quality with full capacity. No ads. No user accounts. No login. Permissions: none beyond standard file picking via the system file picker (no camera, no location, no contacts, INTERNET only for remote app configuration).