A collection of free single-purpose online tools for web developers...
Calculate CIDR network settings using IP address, subnet mask, mask bits, maximum required IP addresses and maximum required subnets
Write Markdown with a beautiful side-by-side preview and export them as also as HTML or PDF
Test many foreground and background color combos for compliance with WCAG 2.0 minimum contrast.
Visually explore building out any flexbox layout and view generated HTML/CSS markup
Modify, improve, trim, change and export your fonts in modern formats
Matches the x-heights and widths of two fonts (webfont and fallback font)
Check if you have an account that has been compromised in a data breach
Generate flowcharts, sequence diagrams, class diagrams, gantt charts and git graphs using a Markdownish syntax
Generate up to 1,000 rows of realistic test data in CSV, JSON, SQL, and Excel formats
Generate recommended TLS configurations for servers
Generate dummy images as data URIs, which don't depend on external services
Remove personal data such as location from images. Works on your computer only, no service or third party involved
Create responsive breakpoints for your images and get the adequate HTML them
Perform a deep analysis of the configuration of any SSL web server on the public Internet
Fix accessibility issues in SVG images exported from tools like Adobe Illustrator
Gives you unicode, hex, ASCII, html, css codes to insert UTF-8 icons and symbols