These media tools draw or calculate on this page. The text and colours you enter are not uploaded, and there is no account. Email syntax is listed with the text tools rather than here.
QR Code Generator builds a symbol at error correction level M and can download a PNG. Input over one thousand characters is refused. Barcode Generator draws Code 128 in set B for printable ASCII. It does not offer EAN, and it does not place your text inside the bars. Favicon Generator paints one square letter mark, 32 or 180 pixels, as a PNG rather than a multi-size ICO file.
Open Graph Generator writes title, description, and social tags. The image field is only the URL you type. The page does not fetch that picture. MIME Type Lookup maps a file extension to a common type from a fixed table. It does not open the file.
Hex to RGB shows the same colour as hex, RGB, and HSL. Contrast Checker computes a WCAG contrast ratio for two colours. It is not an audit of a whole page. Aspect Ratio Calculator simplifies a width and height, or fills in the missing side. It does not crop an image.
Tools
Read the privacy page for what each check sends.