SMRTR ProgrammingJul 1, 2026Daily.dev

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

SMRTR summary

Build a fully browser-based PDF margin editor using JavaScript and PDF-lib, no backend required. The tutorial walks through uploading PDFs, rendering page previews, configuring custom or preset margins, handling mirror margins for binding, and exporting the updated file — all processed locally to keep sensitive documents private and processing fast.

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