Web, SEO and marketing

Tools for publishing on the web: Open Graph and meta tags, robots.txt and sitemaps, UTM campaign links, search snippet previews, social post character counts, CSS layout and effects, bulk barcodes, version ranges and calendar invites.

Open Graph and meta tag generator
Title, description, Open Graph, X card and JSON-LD tags with share previews.
robots.txt and sitemap generator
Build and test robots.txt (RFC 9309) and make sitemap.xml from a URL list.
UTM link builder
Campaign URLs with UTM tags, batch CSV, naming checks and the GA4 channel.
CSS grid and flexbox generator
Visual grid (tracks, areas) and flexbox builder with CSS, HTML and Tailwind output.
CSS effects generator
Border-radius blobs, glass, neumorphism, text shadow, filters and clip-path CSS.
Bulk barcode generator
Many barcodes from a list or CSV: label-sheet PDF, ZIP of PNGs or SVGs, row report.
SERP snippet preview
Google result preview with pixel-width title and description truncation.
Social media character counter
Per-platform character counts, X's weighted count, the cut point and SMS segments.
Semver compare and range checker
Test npm ranges (^, ~, x, ||, hyphen) with reasons, compare, sort and bump versions.
ICS calendar file generator
Make .ics events with time zones, repeats, reminders, CSV import and calendar links.