I Built 80+ Browser Tools. Here Are 9 Engineering Lessons I Learned the Hard Way

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A file converter looks easy until someone uploads a 200-page PDF.

An image compressor looks finished until a 12 MB phone photo freezes the browser.

A word counter looks like ten lines of JavaScript until users paste formatted text, emoji, line breaks, and content copied from Word.

Over the last several months, I have been building small browser-based utilities.

  • PDF tools.
  • Image converters.
  • Text utilities.
  • Calculators.
  • QR and barcode tools.
  • File-processing utilities.

At some point, I stopped counting individual projects and realized I had crossed 80 tools.

I expected to learn more JavaScript.

I did.

What I did not expect was how much these small applications would teach me about browser memory, dependency decisions, file formats, failure states, user interfaces, and performance engineering.

Large applications make architectural complexity obvious.

Small tools hide it behind one button.

The interface can contain three actions while the code behind them deals with megabytes...

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