Building RK DevTools: 55 Free Browser Tools, No Backend Required
By Kasim Kazmi · August 3, 2026 · 5 min read
Why I built a suite of 55 privacy-first developer and design tools that run entirely in the browser, and what recently went into making every single one of them properly discoverable.
Key Takeaways
- RK DevTools is a free suite of 55 browser-based developer and design utilities — no logins, no file uploads, no tracking.
- Every tool processes entirely client-side (Canvas, FileReader, Web Crypto), so nothing you use ever leaves your browser.
- All 55 tools recently got a full SEO and accuracy pass: unique metadata, a real H1, structured data, an FAQ section, and corrected copy where marketing had drifted from what the code actually does.
Alongside client contract work, I've been building and maintaining RK DevTools — a free suite of 55 browser-based developer and design utilities. Color converters, calculators, generators, image utilities, print tools, text tools. No logins, no file uploads, no tracking. Everything runs locally in your browser.
Why build 55 small tools instead of one big product
Most of these tools started the same way: I needed something small and specific for a client project — a contrast checker, a PX-to-REM converter, a QR generator — and instead of using a random ad-heavy site for it, I built my own and kept it.
Over time that turned into a real suite, organized into seven categories, plus a curated 'Greatest Hits' set:
- Colour — 7 tools
- Developer Tools — 8 tools
- Images & Assets — 15 tools
- Math & Calculations — 6 tools
- Print & Production — 3 tools
- Typography & Text — 10 tools
No backend, by design
Every tool processes everything client-side — Canvas, FileReader, the Web Crypto API where relevant. Nothing gets uploaded to a server. That's not just a privacy nicety, it also means the tools work offline once loaded and have effectively zero backend cost to run at scale.
A recent pass: making all 55 tools actually discoverable
For a while, most of these tools were functionally solid but thin on SEO — several had no unique page title or description at all, and almost none had a real page heading (an actual H1, not just styled text). I went through all 55 tools and fixed that properly: every tool now has a unique title and description, a real H1, structured data (SoftwareApplication schema) so search engines and AI answer engines understand what each tool does, and a short FAQ section addressing the questions people actually have (is it free, does it upload my files, what formats does it support).
I also caught and fixed a handful of tools whose marketing copy had drifted from what the code actually does — a background remover that was described as 'AI-powered' but is really RGB-distance chroma-keying, a barcode generator whose copy claimed UPC-A/EAN-13 support it never had. Fixed those to describe reality, not aspiration.
The tools are grouped into category hub pages now too, so if you're looking for free colour tools or free math and calculation tools, there's a dedicated page for that instead of one long undifferentiated list.
Try it
The full suite is at /tools. If you build or design things on the web regularly, there's a decent chance one of these 55 saves you a tab full of ads next time you need a quick conversion or generator. If you'd rather have something custom built for your project instead, see /about for how to get in touch.