Web & Network

CHMOD Calculator Convert Linux file permissions between checkboxes, octal (755) and symbolic (rwxr-xr-x) in your browser. CIDR Subnet Calculator Get network, broadcast, usable host range, netmask and wildcard from any IPv4 address and CIDR prefix — in your browser. CSS Unit Converter (px ↔ em, rem, pt, %) Convert px, em, rem, pt and % with a configurable base font size — full equivalence table in your browser. PPI / DPI Calculator Find the pixel density, dot pitch and sharpness class of any screen from its resolution and diagonal — in your browser. Bitrate Calculator Convert between duration, file size and bitrate for audio and video — in your browser. Data Storage Converter (GB, GiB, MB, Mbps) Convert decimal and binary storage units plus bits and bytes — and finally see why a 1 TB drive shows up as 931 GB. Wi-Fi QR Code Generator Create a QR code that connects any phone to your Wi-Fi network in one scan — built in your browser. What Is My IP See your public IP address and approximate location — city, state, country — detected from the connection, with nothing to install. My HTTP Headers See every HTTP header your browser sends with each request — user agent, accepted languages, encoding, cookies and more. DNS Lookup Look up all DNS records for a domain — A, AAAA, MX, CNAME, TXT, NS and SOA — from the server. WHOIS Lookup Query the WHOIS registration data for any domain — registrar, creation date, expiry, nameservers and contact information. SSL Certificate Checker Check the SSL/TLS certificate of any domain — issuer, validity dates, days until expiry and subject alternative names. Email MX Checker Check whether a domain can receive email by looking up its MX records — the mail servers it points to. HTTP Response Headers Fetch the HTTP response headers of any URL — status code, content type, caching, security headers and more. Online Ping Ping a host or IP address from the server — see round-trip time, packet loss and whether the host is reachable. Reverse DNS Lookup Find the hostname associated with an IP address — the reverse of a DNS lookup. CSS Gradient Generator Design linear and radial CSS gradients visually, adjust colors and angle, and copy the CSS. CSS Box Shadow Generator Design box shadows visually — adjust offset, blur, spread, color and opacity, and copy the CSS. Meta Tags Generator Generate the HTML meta tags your page needs — title, description, Open Graph and Twitter Card — with a live code preview. Favicon Generator Create favicons from text, emoji or an uploaded image in all standard sizes — 16×16 to 512×512. My Screen Resolution See your current viewport and screen resolution — updates live as you resize the window. YouTube Embed Code Generator Generate the HTML embed code for a YouTube video with custom width, height, autoplay and other options. htaccess Generator Build Apache htaccess rules for redirects, SSL and caching.