16 tools in this category.
Generate strong, random passwords with custom length and character sets.
Generate v4 UUIDs / GUIDs in bulk, with multiple formatting options.
Generate random integers or decimals within a custom range.
Generate downloadable QR codes for text, URLs, and more.
Generate downloadable barcodes in CODE128, EAN, UPC, and more formats.
A circular countdown timer with presets, pause/resume, and completion alert.
Design a professional HTML email signature and copy the source.
Draw or type a signature and download it as a transparent-ready PNG.
Build linear, radial, and conic CSS gradients with a live preview and copyable code.
Design multi-layer box shadows and rounded corners with a live preview and copyable CSS.
Generate placeholder images locally with custom size, colors, and text - no network request.
Generate classic Lorem Ipsum placeholder text by paragraphs, sentences, or words.
Compose a field schema and generate realistic mock data (English or Vietnamese) as JSON/CSV.
Build CSS @keyframes animations visually with a live preview and copyable code.
Generate a deterministic geometric avatar (identicon) from any seed text, exportable as PNG or SVG.
Generate Luhn-valid test credit card numbers for Visa, Mastercard, and Amex - for testing only.