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Nanosecond Timer
High-precision online stopwatch with nanosecond accuracy. Lap times, split times, and copy results.
Developer Tools
Developer Tools
16 tools available
Utilities for developers — JSON formatters, encoders, regex testers, and more.
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AI IDE Rules (.cursorrules) Generator
Create optimized .cursorrules and .clinerules files for Cursor, Windsurf, and Cline.
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New
ASCII Text Art Generator
Convert text to beautiful ASCII text art banners instantly. Customize fonts, characters, spacing, and generate code comment blocks with 100% privacy.
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Base64 Encoder & Decoder
Encode and decode Base64 online. Supports text and files. Free, fast, and private.
Developer Tools
New
Bulk URL Opener - Open Multiple Links at Once
Open dozens of URLs in separate tabs with one click. Supports delay between tabs, deduplication, domain grouping, CSV/TXT import, and export. Free, no sign-up.
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New
Code & Text Diff Checker
Compare two code or text files side-by-side. Highlights added, removed, and modified lines in real time. Supports unified view, syntax highlighting, and export.
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Color Contrast Checker
Check contrast ratios between text and background colors to ensure WCAG accessibility compliance.
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New
CSV Column Analyzer
Analyze CSV files locally in your browser. Inspect column stats, missing values, duplicates, and perform clean-up actions with 100% privacy.
Developer Tools
New
cURL to Fetch Converter - Convert cURL to JavaScript
Convert cURL commands to JavaScript fetch() code instantly. Supports headers, request body, auth, cookies, and all common cURL flags. Free, browser-based, no sign-up.
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JSON Formatter & Validator
Format, validate, and beautify JSON online. Minify or prettify JSON with syntax highlighting.
Developer Tools
JSON to Zod Schema Generator
Convert JSON objects into TypeScript-ready Zod schemas instantly.
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New
JWT Decoder
Decode and analyze JSON Web Tokens locally in your browser. Inspect headers, payloads, signatures, and claim definitions instantly.
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New
Schema to LLMs Converter
Convert JSON-LD schemas, HTML documentation, or website details into clean, AI-ready llms.txt markdown formats.
Developer Tools
New
SVG Responsive Optimizer
Optimize SVGs for responsiveness by removing fixed dimensions and adding viewBox support.
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New
Tailwind CSS v4 Color Palette Generator
Generate professional OKLCH color palettes and CSS @theme blocks for Tailwind CSS v4.
Developer Tools
UUID Generator (v4)
Generate random UUIDs (v4) instantly. Bulk generation supported. Free online UUID tool.
Developer Tools