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Zhang Enquan
Zhang Enquan

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I Built 35+ Browser-Side Tools Because I Was Tired of Uploading My Data to Random Servers

#showdev #webdev #opensource #productivity

Every time I needed to format a JSON payload or compress an image, I found myself on some random tool site with three problems:

  1. My data went to their server. Paste a password or an API token into a "hash generator" and you're just trusting that site not to log it.
  2. Ads everywhere. The tool was buried under banners, and half the buttons were ad-click traps.
  3. Sign-up walls. Want to download your converted file? Create an account first.

So I built AI SubTools — a collection of 35+ free tools where everything runs client-side in JavaScript. No uploads. No accounts. No ads.

Why client-side matters

It's not just a privacy stance. When the tool runs in your browser:

  • It's instant. No round-trip to a server, no queue. Image compression happens as fast as your CPU allows.
  • It works offline once the page is loaded.
  • Your data never leaves your device. For tools that touch passwords, tokens, or checksums, this should be the default, not a feature.

Some of the more interesting tools

  • Cron expression generator & tester — with plain-English explanations of what your expression actually does
  • PNG background remover — runs entirely in-browser, no upload
  • Robots.txt + XML sitemap generator — for the SEO-minded
  • EAN/UPC barcode creator — for e-commerce sellers
  • JSON formatter & validator, Base64 encoder/decoder, MD5/SHA-256 generators — the daily-driver classics

The technical trade-offs

The hardest parts were making image compression and background removal perform well without WASM. Canvas-based processing is fast enough for most images, but there's a real art to avoiding UI freezes on large files — chunked processing and careful memory management matter more than raw algorithm speed.

What's next

The site is a side project that grew out of my own daily frustration. New tools are added regularly, and I'm currently prioritizing:

  • More file-format converters
  • Better mobile experience for the image tools

What tools would you want added? I'd genuinely love to hear what's missing from your daily workflow — the best suggestions will get built.

P.S. Everything is free, forever. No premium tier hiding the useful stuff.

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