Tools starting with E

Work out what an appliance costs to run, per day, month and year, from its wattage.

Pull every email address out of a block of text, deduplicated if you want.

Read raw email headers: delivery path, timings, and SPF, DKIM and DMARC results.

Preview email HTML at desktop and phone widths, with images blocked, and check it against client limitations.

Tidy a list of email addresses: deduplicate, normalise case and find malformed entries.

Build an HTML email signature with inline styles that survive Outlook and every other client.

See where a subject line is cut off in common clients, and what in it reads as spam.

Convert between joules, kilowatt hours, calories, food Calories and BTU.

Turn a .env file into a .env.example, TypeScript types or shell exports, and check it for the usual mistakes.

Work out what charging an electric car costs, per charge and per mile or kilometre.

Estimate an electric car's real range from battery size, efficiency, temperature and the charge you keep in reserve.

See the camera, exposure, date and location data hidden inside a photo.

Raise numbers to a power, take any root, and calculate logarithms.

Pull the soundtrack out of a video and save it as a WAV file.

Pull email addresses, links, numbers, hashtags, mentions, IPs or dates out of any text.