Knack is an open-source utility belt for the web — converters, encoders, generators, paste, short links, and more. No accounts required for most tools.
Pretty-print, minify, and validate JSON, XML, and YAML.
Live markdown preview with syntax highlighting. Safe for untrusted content.
Encode and decode UTF-8 text and small files to and from base64.
Two-pane diff with word-level highlights.
Generate cryptographic random strings for API keys, JWT secrets, and tokens.
Generate RFC-compliant UUID v4 and v7 identifiers in your browser.
Strong random passwords with adjustable length and character set.
Generate a QR code from any string. Download as PNG or SVG.
Share text snippets with optional expiry. Anonymous or signed-in.
Drop a file, get a short link with content-disposition download.
Convert PNG, JPEG, WebP, AVIF — your image, your browser.
See your public IP address. Nothing is logged or stored.
Tiny knack.wtf links. Optional expiry. No tracking.
Browser-local notes. No account, no server — stored only in this browser.
Encrypted note that destroys itself after the first read.