Dev tools
with a little warmth finally.
The utilities you use every day, rebuilt with actual care. Soft edges, thoughtful details, zero ads, zero tracking. Like coffee-shop work — comfortable, unhurried, and somehow more productive.
JSON Formatter
Beautify, validate, and collapse JSON trees. Gentle syntax highlighting, sane error messages, no pop-ups.
{ "name": "devtoolslib", "warm": true, "tools": 8 }Open tool →
Color Palette Generator
Pull a harmonious palette from any base color. Export to CSS, Tailwind, or Figma in one click.
--primary: #c65a3a; --accent: #ffbd80; --surface: #faeadb; --ink: #3a1f1a;Open tool →
Small things, done slowly.
Each tool shipped when it was ready — not when it was new. The craft is in what stays out, not what gets added.
Lightning Fast
Optimized for speed with client-side processing and instant results.
Privacy First
All processing happens in your browser. Your data never leaves your device.
Completely Free
All tools are free to use with no registration required.
Mobile Friendly
Works perfectly on all devices - desktop, tablet, and mobile.
Everything, in hand.
A small, edited set. Every tool runs locally in your browser. No sign-up, no tracking, no surprises.
Formatters
Clean up messy code in one click.
JSON Formatter
Format, validate, and beautify JSON data with syntax highlighting and error detection.
CSS Formatter
Format, beautify, and minify CSS code with syntax highlighting. Sort properties, remove duplicates, convert colors, and optimize your stylesheets.
Generators
Spin up colors, data, and more instantly.
Color Palette Generator
Generate beautiful color palettes with 7 professional modes, gradient preview, and export to CSS, SCSS, JSON, or Tailwind.
Mock Data Generator
Generate realistic mock data instantly for testing and development. Create JSON, CSV, or SQL data for users, products, companies, and more with customizable schemas.
Developer Tools
Decode, diff, preview, and convert — fast.
Cron Builder
Build cron expressions visually — set minute, hour, day, month, and weekday fields with presets and see the next 5 run times in plain English.
OG Image Previewer
Preview how your page looks when shared on Twitter, LinkedIn, Facebook, and iMessage. Test your og:title, og:description, og:image and generate meta tags.
Robots.txt Generator
Build a valid robots.txt file visually. Set allow/disallow rules per crawler, block AI bots like GPTBot and ClaudeBot, add sitemap, and download instantly.
HTTP Status Codes
Complete HTTP status code reference — 1xx to 5xx. Plain-English descriptions, exactly when to use each code, and practical examples. Searchable and filterable.
QR Code Generator
Generate QR codes for URLs, text, email, phone, Wi-Fi, and SMS. Customize colors and size. Download PNG or SVG — all in your browser, nothing uploaded.
JWT Decoder
Decode and inspect JSON Web Tokens instantly. View header, payload, claims, and expiry status — all in your browser, nothing sent to a server.
Markdown Preview
Write Markdown and see a live HTML preview side by side. Download as HTML or copy the rendered output. Supports tables, code blocks, and more.
Diff Viewer
Compare two blocks of text or code and see every change highlighted line by line. Inline and split view modes with addition/removal counts.
Word Counter
Count words, characters, sentences, and paragraphs. Get reading time, speaking time, Flesch readability score, and top keywords — live as you type.
Slug Generator
Convert any title or phrase into kebab-case, snake_case, camelCase, PascalCase, dot.case, and path/case slugs instantly. One click to copy any format.
Meta Tag Analyzer
Paste any public URL and instantly audit its title, description, Open Graph, Twitter Card, canonical, robots, and viewport tags — with pass/fail scores and character count warnings.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates — local time, UTC, ISO 8601, and relative. Or pick a date and get the epoch. Live clock always visible.
Sitemap Generator
Build a valid XML sitemap for Google Search Console. Add URLs manually or paste in bulk, set changefreq and priority, download sitemap.xml instantly.
Tone Rewriter
Paste any text and rewrite it as Formal, Casual, or Concise in one click. Rule-based transformations — no AI API, no data uploaded, works entirely in your browser.
Business
Invoices, calculators, and tools for freelancers.
Image Tools
Resize, convert, and edit images — all in-browser.
Favicon Generator
Upload any image and generate favicons in all 18 sizes — 16×16 to 512×512. Get favicon.ico, Apple touch icons, Android PWA icons, and a ready-to-paste HTML snippet. Free, browser-only.
Image Format Converter
Convert images between PNG, JPEG, WebP, BMP, and ICO formats with adjustable quality settings.
Product Background Editor
Create professional product images with custom backgrounds, shadows, and auto-lighting. Perfect for e-commerce and social media.
Image Resizer
Resize images with social media presets (Instagram, YouTube, Facebook) or custom dimensions while maintaining aspect ratio.
Base64 Encoder
Convert images to Base64 encoding for embedding in HTML, CSS, or JSON. Get data URI or plain Base64.
Hello. I'm Mithal.
I build developer tools the way I wish more software got built — without ads, without pop-ups asking for your email, without the quiet collection of whatever they can quietly collect.
Every tool here runs entirely in your browser. Nothing leaves the page. Nothing is stored. It's a small commitment, and an easy one to keep.
If something here saves you a minute of your day, that's the whole point. If you'd like to say hello, the door is open.