Web development
21 tools
Cron Expression Parser Explain a cron expression in plain English and list its next run times in your time zone or UTC. Markdown Preview Write Markdown and see it rendered live with GitHub Flavored Markdown, then copy the HTML. HTML, CSS & JS Playground Write HTML, CSS and JavaScript and see the result instantly, with a console, share links and HTML download. Runs in a sandbox in your browser. URL Parser Break a URL into protocol, host, port, path, query parameters and fragment, decode them, and edit the query to rebuild the URL. CSS Gradient Generator Build linear, radial and conic CSS gradients visually with color stops, angle and position, see a live preview, start from presets and copy the CSS. CSS Box Shadow Generator Design CSS box shadows visually: stack several layers, set offset, blur, spread, color and inset, see a live preview, start from presets and copy the CSS. Favicon Generator Make a favicon from text, an emoji or your logo: favicon.ico, PNG sizes, Apple touch icon, web manifest and HTML tags in one ZIP. Meta Tag Generator Generate SEO meta tags, Open Graph and Twitter card tags for your page, with a search and social preview. User Agent Parser Parse a User-Agent string into browser, engine, operating system, device and CPU, and spot crawlers, AI bots and HTTP clients. Subnet Calculator (IPv4 CIDR) Calculate network and broadcast addresses, host range, host count, netmask and wildcard from a CIDR or IP and mask, and split a network into subnets. Chmod Calculator Convert Unix file permissions between checkboxes, octal (755) and symbolic (rwxr-xr-x) notation, with setuid, setgid and sticky bits and a ready-to-copy chmod command. Time Zone Converter Convert a date and time between time zones around the world, with daylight saving time, UTC offsets and day changes shown for each zone. Color Contrast Checker (WCAG) Check the WCAG 2.x contrast ratio of text and background colors, see AA and AAA pass or fail for normal text, large text and UI, preview it live and get the nearest passing color. PX to REM Converter Convert px to rem or em (and back) with any base font size, see a conversion table, and convert every px value in pasted CSS at once. Robots.txt Generator Create a robots.txt file: allow or disallow paths per user-agent, add your sitemap and crawl-delay, and block AI crawlers in one click. XML Sitemap Generator Turn a list of URLs into a sitemap.xml with lastmod, changefreq and priority, or validate and format an existing sitemap. .htaccess Generator Generate an Apache .htaccess file: force HTTPS, www redirects, 301 redirects, 404 page, gzip, caching and security headers. CSS Border Radius Generator Set CSS border-radius per corner, including elliptical corners and blob shapes, in px, % or rem, with a live preview, presets and the shortest CSS to copy. Online Image Editor Crop, rotate, flip, resize and color-correct photos in your browser, apply filters, read EXIF, and save as PNG, JPG or WebP. Nothing is uploaded. CSS Font Stack Generator Build a cross-platform CSS font-family stack with system fonts, Chinese/Japanese/Korean fallbacks and emoji. CSS Sprite Generator Combine icons into one sprite sheet PNG and get the CSS background-position classes for each image.