Tools
Small utilities for web development and web production.
OGP Checker
Inspect key Open Graph and Twitter Card metadata from a URL.
Schema Checker
Detect JSON-LD and microdata from a URL, then check basic Schema.org fields.
Schema Generator
Generate JSON-LD for Article, BreadcrumbList, Organization, WebSite, and SoftwareApplication in the browser.
Meta Tag Checker
Check title, description, canonical, robots, viewport, and other basic metadata from a URL.
Hreflang Checker
Extract alternate hreflang links from a URL and check duplicates, relative URLs, and x-default.
Emoji List
Search, sort, and copy Unicode emoji for titles, snippets, labels, and small UI details.
Batch Image Compressor
Compress images in the browser and download a ZIP that preserves folder structure.
Image Size and Format Inspector
Check image format, file size, width, height, and aspect ratio directly in the browser.
PDF Compressor
Re-save a PDF in your browser and output a smaller version when it actually reduces the file size.
Audio to MP3 Converter
Convert audio files to MP3 in your browser and download each result.
Image Redactor
Add black boxes or mosaic blocks to an image, edit it in the browser, and download the result.
Browser Environment Report
Review and copy browser, screen, and viewing environment details in one place.
Share Button Generator
Generate share URLs and copyable HTML for X, Facebook, LINE, and other services in the browser.
CSS Easing Generator
Tune cubic-bezier curves for CSS transitions and animations while previewing the motion.
Favicon Generator
Generate a complete favicon package from one image, or check the icon settings of an existing site.
Sitemap Checker
Find XML sitemaps from a site URL or sitemap URL, then check URL counts, lastmod values, and robots.txt references.
llms.txt Checker
Find llms.txt from a site URL and check whether it is structured clearly for LLMs.
llms.txt Generator
Choose a template, fill in the fields, and generate an llms.txt file for LLMs.
Color Contrast Checker
Check foreground and background color pairs against readability and WCAG guidance.
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