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Everyday developer utilities

Timestamps, URL encoding, QR codes, Markdown preview — the small things you look up constantly.

URL Encoder & DecoderPercent-encode and decode URLs and query strings, with explicit component, full-URL and form modes. Runs entirely in your browser.Unix Timestamp ConverterConvert epoch seconds, milliseconds, microseconds and nanoseconds to a date in any timezone and back, with BigInt precision so nanosecond values are never rounded.Text Diff CheckerCompare two blocks of text with line and word-level highlighting, whitespace and case options, and a unified diff you can save as a patch.Markdown to HTML Converter & PreviewConvert Markdown to HTML with a live preview, copy the markup, or save it as a PDF — raw HTML is escaped, so a pasted document cannot run anything.QR Code GeneratorGenerate a QR code from any text or URL and download it as SVG or PNG. Encoded entirely in your browser — the data never reaches a server, unlike most QR sites.