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80 Precision Utilities • 100% Client-Side • Sub-2ms Latency

The Browser-Native Developer Power Suite

Engineered for software architects, AI engineers, UI designers, mobile developers, and webmasters. No accounts, no paywalls, zero server uploads. Your data stays in your browser.

studio_sandbox.ts
Live JSON TransformerClient-Side Valid
{
  "project": "WebCraftKit",
  "status": "online",
  "speed": "0ms",
  "privacy": 100
}
Need schema validation, TypeScript generation, or tree view?Launch Full JSON Studio
Curated Highlights

Featured Power Studios

View all 80 tools ↓
Interactive Developer Pipelines

Engineered for Multi-Step Engineering Flows

Chain complementary tools together with 100% client-side zero-copy output piping. No manual copy-pasting required.

⚡ API & Type Pipeline
3 Steps

Beautify backend JSON response, compile strongly-typed TypeScript definitions, and generate LLM function schemas.

🔒 Security & Token Pipeline
3 Steps

Deconstruct JWT authentication tokens, extract claim payloads, and compute cryptographic integrity hashes.

📱 Vector & Icon Studio
3 Steps

Convert master vector SVGs to high-res PNGs, package Xcode/Android adaptive app icons, and generate favicons.

🤖 AI & RAG Pipeline
3 Steps

Partition documents into overlapping chunks, estimate LLM token context usage, and construct system prompts.

🎯 Campaign & Growth Pipeline
3 Steps

Standardize UTM tracking parameters, generate customized QR codes, and test Google/Meta Ad copy previews.

🚀 Production Deploy Suite
3 Steps

Generate hardened .htaccess / Nginx security directives, configure AI crawler robots.txt, and minify HTML markup.

All Utilities Registry

Complete Developer Workbench

Filter or switch between high-density Command Table and Card Grid views.

Utility EngineAction
JSON FormatterPopular

Format, validate, beautify, and inspect JSON with custom indentation and tree view.

Open
JSON to TypeScriptPopular

Convert JSON payloads into robust, type-safe TypeScript interfaces and types.

Open
JWT DecoderEssential

Inspect and decode JWT headers and payloads with live expiration countdown.

Open
Base64 ToolPopular

Encode and decode UTF-8 text or drop binary files to generate Base64 data URIs.

Open
Hash GeneratorEssential

Compute MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly using Web Crypto.

Open
URL EncoderUpdated

Encode and decode query strings and parse complex URLs into editable key-value tables.

Open
Timestamp ConverterPopular

Convert Unix epoch timestamps to ISO 8601, UTC, local date strings, and relative times.

Open
Regex TesterUpdated

Test JavaScript regular expressions with real-time capture group highlighting.

Open
GlassmorphismPopular

Create ultra-modern frosted glass UI effects with customizable backdrop blur and transparency.

Open
Box Shadow GeneratorEssential

Craft smooth, multi-layered realistic CSS box shadows with light angle controls.

Open
Gradient GeneratorPopular

Design linear, radial, and conic CSS gradients with multi-color stops and angles.

Open
Color Contrast CheckerA11y

Calculate contrast ratios to guarantee WCAG 2.1 AA and AAA compliance.

Open
Meta Tag GeneratorPopular

Generate SEO meta tags with live visual previews for Google, Twitter, and Facebook.

Open
Markdown Editor

Real-time split-screen Markdown editor with live preview and HTML export.

Open
Password & UUID GeneratorEssential

Generate cryptographically secure random passwords with entropy ratings, alongside bulk UUID v4 generation.

Open
Text UtilitiesPopular

Convert text cases (camelCase, snake_case, UPPERCASE), analyze word counts and reading time, and compare text diffs.

Open
Image CompressorPopular

Compress, resize, and convert JPEG, PNG, and WebP images locally with real-time compression metrics.

Open
SVG ConverterEssential

Convert SVG vectors into high-res PNG, React JSX/TSX components, Data URIs, and optimized markup.

Open
Favicon GeneratorNew

Generate a full multi-platform favicon suite, web manifest, and HTML tags with ZIP export.

Open
Cron GeneratorPopular

Create, explain, and validate standard 5-part and Quartz cron expressions with upcoming run schedules.

Open
SQL FormatterEssential

Beautify and minify SQL queries for PostgreSQL, MySQL, T-SQL, BigQuery, and SQLite.

Open
JSON / CSV ConverterPopular

Bi-directional conversion between JSON arrays and CSV/TSV spreadsheets with RFC 4180 compliance.

Open
HTML / XML FormatterNew

Beautify, validate, and minify HTML5, XML, SVG, and RSS documents with syntax error detection.

Open
Palette GeneratorPopular

Create harmonious color palettes with monochromatic, complementary, and triadic schemes with CSS/Tailwind export.

Open
CSS Clamp CalculatorNew

Generate fluid typography and responsive spacing formulas with CSS clamp() between custom breakpoints.

Open
QR Code GeneratorEssential

Create custom styled QR codes with logo embedding, colors, error correction, and SVG/PNG export.

Open
cURL to CodeEssential

Transform cURL commands into JavaScript Fetch, Axios, Python Requests, Go, and PHP client code.

Open
YAML & JSON ConverterPopular

Bi-directional YAML to JSON and JSON to YAML converter with syntax validation and schema formatting.

Open
Code Diff CheckerEssential

Compare code and text with side-by-side visual diffs, character-level highlighting, and whitespace controls.

Open
Chmod CalculatorPopular

Interactive Linux permissions calculator for octal (755, 644) and symbolic (rwxr-xr-x) modes with special bits.

Open
Clip-Path GeneratorPopular

Visually craft CSS clip-path polygons, shapes, and responsive clipping masks with drag-and-drop handles.

Open
Cubic-Bezier AnimatorNew

Design custom cubic-bezier easing curves and transition timing functions with live motion preview.

Open
CSS Loader GeneratorNew

Customizable pure CSS loading spinners, skeleton animations, and bouncing indicators with single-click copy.

Open
Robots.txt GeneratorPopular

Create optimized robots.txt files with directives for search engines and modern AI web crawlers.

Open
.htaccess GeneratorEssential

Generate Apache .htaccess and Nginx rules for redirects, HTTPS enforcement, and security headers.

Open
HTML MinifierNew

Minify raw HTML markup, inline CSS styles, and inline scripts for faster page load times.

Open
LLM Token CounterEssential

Universal token counter and cost calculator for OpenAI, Anthropic, Gemini, and Llama 3.

Open
System Prompt StudioPopular

Interactive studio to generate structured, production-ready system prompts and meta-prompts.

Open
LLM Schema BuilderEssential

Generate strict JSON Schemas, OpenAI Structured Outputs, and function calling tools.

Open
RAG Document ChunkerNew

Split documents and code for RAG with recursive, token-aware chunking and overlap.

Open
Schema Markup GeneratorEssential

Visual Schema.org JSON-LD structured data generator for Google rich snippets and search results.

Open
XML Sitemap GeneratorPopular

Generate valid XML sitemap files with bulk import, priority mapping, and image tags.

Open
Keyword Density AnalyzerEssential

Analyze keyword density, N-gram phrase frequencies, and content readability scores.

Open
Hreflang Tags GeneratorNew

Generate multi-language and regional hreflang tags for international SEO.

Open
App Icon GeneratorEssential

Generate complete Xcode AppIcon.appiconset with Contents.json and Android mipmap adaptive icon suites from a single 1024x1024 master image.

Open
Screenshot StudioPopular

Wrap app screenshots inside iPhone 16 Pro and Pixel 9 device frames with customizable gradient backdrops, headlines, and export store-ready PNGs.

Open
Strings ConverterEssential

Bi-directional localization converter between Android strings.xml, iOS Localizable.strings, Flutter ARB, and JSON with format specifier validation.

Open
DPI & DP CalculatorNew

Real-time DP, SP, PT, and PX screen density matrix converter across iOS (@1x, @2x, @3x) and Android (mdpi to xxxhdpi) resolutions.

Open
Deep Link StudioEssential

Generate and test custom URL schemes, Apple App Site Association (apple-app-site-association) and Android assetlinks.json files.

Open
UTM Link BuilderEssential

Generate clean, standardized Google Analytics UTM campaign tracking URLs with channel presets, auto-slugify, and instant QR codes.

Open
Ad Copy PreviewPopular

Real-time Google Responsive Search Ads and Meta Facebook/Instagram sponsored feed ad copy editor with character limits and live card preview.

Open
Readability AnalyzerEssential

Calculate Flesch Reading Ease, Grade Level, and sentence complexity with live passive voice highlighting and reading time estimators.

Open
A/B Test CalculatorNew

Calculate two-tailed Z-score, P-value, conversion uplift %, and sample size requirements for CRO experimentation with 95% / 99% confidence.

Open
Headline AnalyzerPopular

Score headlines from 0 to 100 based on power words, emotional triggers, character limits, and estimated click-through rate (CTR) potential.

Open
DESIGN.md GeneratorEssential

Generate machine-readable DESIGN.md files, Tailwind v4 @theme tokens, and UI guidelines for Cursor, Claude Code, and Copilot.

Open
AGENTS.md GeneratorPopular

Generate universal AGENTS.md, .cursorrules, CLAUDE.md, and Copilot instructions with stack presets and anti-hallucination guardrails.

Open
llms.txt GeneratorNew

Generate and validate spec-compliant llms.txt and llms-full.txt files with live BPE token estimation and sitemap.xml import.

Open
HTML to JSX ConverterPopular

Convert standard HTML markup, inline styles, and SVG attributes into clean React JSX & TypeScript TSX components.

Open
Color Space & OKLCH StudioPopular

Convert web colors across OKLCH, HEX, RGB, HSL, Display P3, and CMYK with WCAG contrast and shade scales.

Open
SQL to TypeScript ConverterEssential

Transform SQL CREATE TABLE statements into TypeScript types, Zod schemas, and Prisma ORM models.

Open
Number Base & Bitwise StudioPopular

Convert numbers across Decimal, Binary, Hex, Octal, and Float with an interactive 64-bit bitfield matrix.

Open
XML / JSON ConverterPopular

Convert between XML, SOAP web service envelopes, and JSON objects with attribute and array mapping.

Open
PX to REM & Clamp ConverterEssential

Convert PX to REM, EM, and generate fluid CSS clamp() responsive typography formulas.

Open
Excel / CSV / SQL StudioPopular

Convert Excel (.xlsx/.xls), CSV, TSV, JSON, and SQL INSERT queries with live data table preview.

Open
HEIC to JPG ConverterPopular

Convert Apple iPhone HEIC and HEIF photos to JPG, PNG, or WebP with batch ZIP download.

Open
Universal Image ConverterEssential

Batch convert and resize images across WebP, PNG, JPG, AVIF, ICO, and BMP client-side.

Open
DOCX to Markdown ConverterPopular

Convert Microsoft Word .DOCX files to Markdown and HTML with table parsing and live preview.

Open
Web Font ConverterEssential

Inspect, convert, and subset TTF, OTF, and WOFF fonts with live glyph preview and @font-face CSS.

Open
PDF Converter StudioPopular

Convert PDF pages to Retina PNG/JPG images and extract embedded text client-side.

Open
Archive Explorer & ConverterEssential

Explore archive file trees, preview files, and convert between ZIP, TAR, and GZ formats in browser RAM.

Open
Code to ImageNew

Convert code snippets into beautiful, high-resolution screenshots with syntax themes, gradients, and macOS window styling.

Open
LLM JSON RepairAI

Instantly repair broken, truncated, malformed, or markdown-wrapped JSON outputs from LLMs.

Open
Docker to ComposeDevOps

Convert complex CLI docker run commands into clean, standard docker-compose.yml configuration files.

Open
CIDR & Subnet CalcNetwork

Calculate IPv4/IPv6 CIDR prefixes, subnet masks, usable host ranges, and VLSM partitions.

Open
CSP & CORS StudioSecurity

Build and audit Content Security Policy (CSP) and CORS HTTP headers for Apache, Nginx, and Cloudflare.

Open
SVG OptimizerVector

Optimize and clean SVG files, strip metadata, reduce file size, and export React JSX.

Open
SSL Certificate DecoderSecurity

Decode and inspect X.509 SSL/TLS certificates, SANs, expiry timelines, and fingerprints.

Open
Hex to ASCIINew

Convert text to Hex, decode Hex to ASCII/UTF-8, and generate formatted hex dumps.

Open
Mock Data GeneratorNew

Generate custom test data, seed tables, and export in JSON, CSV, SQL, or TypeScript.

Open
Invisible Character DetectorNew

Detect and remove zero-width spaces, BOM markers, NBSP, and hidden Unicode traps.

Open
WebCraftKit Platform 100% Client-Side Engine

Air-Gapped Privacy & Zero-Latency Developer Utilities

Every cryptographic algorithm, schema transformer, color space converter, and binary extractor runs entirely in your browser RAM. Your tokens, API secrets, and source code are never sent to external servers.

Zero Server Telemetry
•
Sub-Millisecond Execution
•
80 Production Tools
Read Architecture Story →
Enterprise Privacy Architecture

Client-Side Native vs. Legacy Server Utilities

Traditional converter tools transmit your confidential tokens and source code across the internet. WebCraftKit executes 100% in your device's local memory.

0 KB
Network Transmission
Your inputs never touch any external server
< 2ms
Execution Latency
Instant hardware-accelerated WebCrypto computations
100/100
Core Web Vitals
Zero cumulative layout shift (CLS 0.0)
Offline
Edge & Airplane Mode
Functions without an active internet connection
Knowledge Base

Frequently Asked Questions

Everything you need to know about WebCraftKit's privacy, performance, and architecture.

Knowledge Base & Clarifications

Frequently Asked Questions

Everything you need to know about functionality, client-side privacy, specifications, and browser performance.