The latest articles on DEV Community by Muhammad shayan (@muhammad_shayan). https://dev.to/muhammad_shayan https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4174948%2Fe99c8b4d-d7b3-4a52-812e-7140b6f8647d.jpg https://dev.to/muhammad_shayan en Muhammad shayan Sat, 10 Oct 2026 09:18:47 +0000 https://dev.to/muhammad_shayan/i-built-24-free-dev-tools-that-run-entirely-in-your-browserpublished-274p https://dev.to/muhammad_shayan/i-built-24-free-dev-tools-that-run-entirely-in-your-browserpublished-274p <p>false<br> tags: webdev, showdev, javascript, opensource<br> cover_image: <a href="https://byte-kit.dev/og-image.png" rel="noopener noreferrer">https://byte-kit.dev/og-image.png</a></p> <p>Every developer has a folder of bookmarked "free online tools" — JSON formatters, Base64 encoders, image converters. And every one of them has the same problem: you paste your data into some stranger's server and hope for the best.</p> <p>I got tired of that tradeoff, so I built <a href="https://byte-kit.dev/" rel="noopener noreferrer">Byte-Kit</a> — 24 developer tools that run 100% in your browser. No uploads, no accounts, no tracking. Your data never leaves your device.</p> <h2> What's in the box </h2> <p>The usual suspects, done right:</p> <ul> <li> <strong>JSON Formatter &amp; Validator</strong> — beautify, minify, and validate with precise error locations</li> <li> <strong>JWT Decoder</strong> — inspect headers and payloads without sending tokens anywhere</li> <li> <strong>Regex Tester</strong> — live highlighting with capture group breakdowns</li> <li> <strong>LLM Token Counter</strong> — estimate token usage before hitting paid APIs</li> </ul> <p>Plus CSS tools (PX to REM, glassmorphism and box-shadow generators), encoders (URL/Base64, HTML entities, case converter), generators (passwords, UUIDs, prompt templates), and a full image workshop: batch converter, compressor, HEIC and AVIF converters, EXIF remover, SVG optimizer, and favicon generator.</p> <h2> Why "runs in your browser" matters </h2> <p>Take the JWT decoder as an example. Pasting a production token into a random website is genuinely risky — those tokens are session credentials. With Byte-Kit, the decoding happens in JavaScript on your machine. Same for the EXIF remover: the whole point is photo privacy, so uploading your photos to strip them would be absurd.</p> <h2> How it's built </h2> <p>It's a statically-exported Next.js site — every page is pre-rendered HTML, hosted on GitHub Pages. No server, no database, nothing to scale or secure. The heavy lifting (HEIC decoding, image tracing, ZIP generation) happens in Web Workers and WASM-style libraries loaded on demand, so the homepage stays light.</p> <p>I also kept the design deliberately minimal — no badge pills, no glow effects, no AI-slop gradients. Just clean tools that load fast.</p> <h2> Try it </h2> <p>It's free and open source (MIT): <a href="https://byte-kit.dev/" rel="noopener noreferrer">byte-kit.dev</a> · <a href="https://github.com/Shayan34789/byte-kit" rel="noopener noreferrer">GitHub</a></p> javascript opensource showdev webdev