SMRTR ProgrammingJul 20, 2026Daily.dev

How to Build a Browser-Based PDF Signature Tool Using JavaScript

SMRTR summary

Build a browser-based PDF Signature Tool using JavaScript, PDF.js, and PDF-lib — no printing or scanning required. Users can draw, type, or upload signatures, add text stamps, position elements visually over a PDF preview, and download the finalized document. The tutorial covers coordinate conversion, canvas rendering, multi-page targeting, and transparency handling.

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