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May 12 · 6 min read · The Problem Building an invoice generator that works correctly for multiple regions means handling tax rules that differ not just by country, but by sub-region (Canadian provinces), transaction type (India domestic vs interstate), and B2B context (EU...
Join discussionMay 12 · 4 min read · The Document Information Dictionary Every PDF contains an optional document information dictionary with standard string fields. The PDF spec defines these as: Title — the document's title Author — the author Subject — a description of the content Ke...
Join discussionMay 12 · 5 min read · The Core Problem Converting a PDF page to an image in the browser requires rendering the PDF onto a canvas, then exporting the canvas to JPEG or PNG. Three things matter: Bundle size — PDF.js is large (~1MB). Loading it eagerly bloats your main bund...
Join discussionMay 12 · 5 min read · The Core Problem Removing pages from a PDF with pdf-lib isn't a "delete" operation — it's a rebuild. You create a new document, copy only the pages you want to keep, and discard the rest. The tricky part: copyPages works with original indices from th...
Join discussionMay 12 · 4 min read · The Core Problem Converting between image formats in the browser comes down to one function: canvas.toDataURL(mimeType, quality). But three things trip up a naive implementation: Transparent → JPEG — JPEG has no alpha channel. A transparent PNG conv...
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