Design
Generate a clean, copy-paste HTML email signature that renders correctly in Gmail, Outlook, and Apple Mail — with avatar/logo, social icons (auto-detected from your links), accent color, light/dark/auto theme, and a table-based email-safe layout using inline styles. Copy the raw HTML and paste straight into your mail client.
email-signature-html-builderValidation
Validate 8-digit EAN-8 / GTIN-8 product barcodes with check-digit verification, GS1 country prefix and packaging breakdown.
ean8-validatorScience & Education
Look up electron configurations, shell distributions, valence electrons, and orbital diagrams by element symbol or atomic number
electron-configuration-calculatorMath & Numbers
Convert degrees to arcminutes with configurable decimal precision
degrees-to-arcminutesMath & Numbers
Convert degrees to arcseconds with configurable decimal precision
degrees-to-arcsecondsMath & Numbers
Convert degrees to gradians with configurable decimal precision
degrees-to-gradiansMath & Numbers
Convert degrees to radians with configurable decimal precision
degrees-to-radiansSecurity
Generate Ed25519 or X25519 keypairs from random or deterministic seed text, then sign or verify messages
ed25519-x25519-keygen-signature-verifierMedia
Convert DNG (Digital Negative) RAW files to JPEG format. Automatically extracts image dimensions and metadata from the RAW file.
dng-to-jpgMedia
Convert DNG (Digital Negative) RAW files to PNG format. Automatically extracts image dimensions and metadata from the RAW file.
dng-to-pngMath & Numbers
Convert electronvolts to joules with configurable precision
electronvolt-to-jouleMedia
Convert DSD (Direct Stream Digital) audio files to PCM WAV format with selectable bit depth and sample rate
dsd-to-pcm