Developer & Designer Tools
A free client-side toolbox of 35+ developer and designer utilities for formatting, SEO, security, accessibility, and everyday workflows.
Base64 & URL Encoder
Convert text strings to Base64 or URL-encoded formats, and decode them back client-side.
Client Header Inspector
View User Agent strings, viewport measurements, screen resolution, and incoming request headers.
Code Sandbox
Write HTML and CSS in real-time to inspect live rendering and edit styles on the fly.
Cron Pattern Visualizer
Translate cron expressions into human-readable descriptions and visualize scheduler runtimes.
CSV to Markdown table
Convert Excel or comma-separated lists into clean, readable Markdown layout tables.
cURL Command Converter
Convert raw CLI cURL commands into PowerShell (Invoke-RestMethod), Axios, Fetch API, Python, Go, and Node.js code.
GIF Generator
Convert local MP4, WebM, or OGG videos into animated GIFs entirely in your browser with size and frame rate customization.
Git Scenario Builder
Select Git workflows and customize branch/commit settings to output ready-to-use terminal commands.
Hash & HMAC Generator
Generate SHA-1, SHA-256, and SHA-512 hashes or HMAC signatures with custom keys locally.
HTML Head SEO Analyzer
Paste page markup to audit indexing elements like title length warnings, meta tags, and OpenGraph parameters.
Image Compressor
Resize and optimize images completely client-side using adjustable quality sliders and width bounds.
JSON Formatter & Validator
Beautify, inspect, validate syntax errors, and minify raw JSON payloads with formatting settings.
JSON to SQL inserts
Instantly format raw JSON arrays or tables into SQL INSERT statements.
JSON to Zod & TS
Paste raw JSON to generate TypeScript interfaces and Zod validation schemas client-side.
JSON-LD Schema Generator
Generate FAQ, Local Business, or Article JSON-LD structured schemas by filling out form inputs.
JWT Debugger
Decode and inspect JSON Web Tokens locally. Review payload data, algorithms, and key expiration dates.
Keyword Density Analyzer
Paste copy to analyze word count, reading duration, and term densities with stopwords filter controls.
Meta Tag Generator
Build website header tags by filling in title, description, OpenGraph, and Twitter Card details.
MongoDB URI Builder
Visually construct database connection strings by entering hosts, credentials, and parameters.
Password Generator
Generate secure passwords matching character rules, symbol pools, length metrics, and crack time estimates.
PDF Decrypter
Download a password free version of your pdf for free and completely on your browser
PEM to JWK Converter
Convert PEM public/private keys to JSON Web Key (JWK) configurations fully client-side.
QR Code Generator
Create high-resolution QR codes dynamically. Supports size parameters and foreground/background colors.
Redirect Rules Generator
Create 301 and 302 redirect rules for Nginx, Apache (.htaccess), Next.js, and IIS.
RegEx Tester
Test regular expressions against strings with match visualizations, flag switches, and group listings.
Robots.txt Generator
Generate robots.txt parameters by defining allow/disallow paths, crawlers, and sitemap locations.
SERP Snippet Preview
Preview how titles, meta descriptions, and URL structures render in Google desktop and mobile search views.
SQL to Prisma schema
Convert raw SQL CREATE TABLE statements into Prisma schema model declarations.
SVG Optimizer & Exporter
Clean up vector XML data by dropping useless metadata, view rendering preview, and export to PNG.
Tailwind Config Maker
Generate custom tailwind.config.js theme extension blocks by selecting primary colors, fonts, and breakpoints.
Text Diff Checker
Compare two blocks of code or text side-by-side to highlight line additions, updates, and removals.
URL Slug Generator
Convert text strings to clean URL slugs by removing stopwords, adjusting casing, and replacing spaces.
WCAG Contrast Checker
Input foreground and background colors to verify contrast ratio compliance with AA and AAA standards.
Word & Character Counter
Analyze word counts, character lengths, reading and speaking durations, and readability scores in real-time.
XML Sitemap Generator
Generate standard-compliant XML sitemaps, validate schema rules, or split large sitemaps into index files.
Why Use Our Developer & Designer Toolbox?
When building modern websites and web applications, developers and designers need quick utilities. Instead of using third-party sites that collect your data, this toolbox runs completely client-side. Every calculation, conversion, and validation happens in your browser for privacy and speed.
Formatters, Validators & RegEx
Catch syntax errors quickly with our JSON formatter and test patterns with our regex tester. You can inspect, validate, and minify nested structures right in your browser.
WCAG Accessibility & Design
Check color compliance with our WCAG contrast checker. It calculates AA and AAA contrast ratios in real time to keep your interface readable for all users.
SEO & Indexing Automation
Prepare your site for search crawlers with our XML sitemap generator, create header tags with the meta tag generator, and configure crawl rules with the robots.txt generator.
Private Tokens & Security
Generate secure credentials and inspect tokens locally. Your inputs never touch a server, so your tokens and secrets remain private to your active browser session.
Looking for hands-on tutorials? Read deep-dive engineering articles that show these tools in real workflows
Frequently Asked Questions
Are these developer tools free to use?
Yes. Every tool in this directory is 100% free with no sign-up or subscription required.
Do the tools run client-side or send data to a server?
All tools run directly in your browser using client-side JavaScript. Your text, payloads, keys, and files are never sent to a remote server.
Can I use these tools for commercial projects?
Yes. You can use generated code, schemas, formatted files, and config files across personal and commercial applications.
Do you plan to add more tools over time?
Yes. New developer utilities and SEO tools are added regularly based on community feedback and modern web engineering needs.