Nanosecond Timer
High-precision online stopwatch with nanosecond accuracy. Lap times, split times, and copy results.
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16 tools available
Utilities for developers — JSON formatters, encoders, regex testers, and more.
High-precision online stopwatch with nanosecond accuracy. Lap times, split times, and copy results.
Create optimized .cursorrules and .clinerules files for Cursor, Windsurf, and Cline.
Convert text to beautiful ASCII text art banners instantly. Customize fonts, characters, spacing, and generate code comment blocks with 100% privacy.
Encode and decode Base64 online. Supports text and files. Free, fast, and private.
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.
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.
Check contrast ratios between text and background colors to ensure WCAG accessibility compliance.
Analyze CSV files locally in your browser. Inspect column stats, missing values, duplicates, and perform clean-up actions with 100% privacy.
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.
Format, validate, and beautify JSON online. Minify or prettify JSON with syntax highlighting.
Convert JSON objects into TypeScript-ready Zod schemas instantly.
Decode and analyze JSON Web Tokens locally in your browser. Inspect headers, payloads, signatures, and claim definitions instantly.
Convert JSON-LD schemas, HTML documentation, or website details into clean, AI-ready llms.txt markdown formats.
Optimize SVGs for responsiveness by removing fixed dimensions and adding viewBox support.
Generate professional OKLCH color palettes and CSS @theme blocks for Tailwind CSS v4.
Generate random UUIDs (v4) instantly. Bulk generation supported. Free online UUID tool.