Guides that explain the method behind the tools

These calculators cover the sums people actually need to work out: a loan or mortgage payment, what savings grow to, whether a price leaves a healthy margin, a BMI, a due date or a shared bill.

Most PDF jobs are small but awkward: a file too big for an upload form, three scans that should be one document, a page that came out sideways, a report that needs page numbers or a password.

Converters translate a value or file from one format into another: a WebP picture into a JPG, miles into kilometers, a HEX color into HSL, a Unix timestamp into a date.

Quick image jobs rarely justify opening a full photo editor: shrinking a picture for an upload form, cropping to a square, hiding a number before sharing a screenshot, or opening an iPhone photo on a PC.

These tools cover everyday language and document tasks: checking spelling and grammar, pulling text out of a photo, dictating notes, building prompts for chat and image generators, testing a resume against applicant-tracking rules and estimating whether writing reads like machine text.

Generators turn a few inputs into something you can use straight away: a random password, a QR code, a PDF invoice, an APA reference, a CSS gradient or a set of fake records for testing.

Text tools handle the small, repetitive jobs around writing: counting words against a limit, fixing the case of a headline, removing the line breaks a PDF adds, comparing two drafts or sorting a pasted list.

Small jobs that interrupt real work: pretty-print a minified API response, find the trailing comma that breaks a config file, read the claims inside a token from a failing login, see when a cron line will really fire, or convert CSS units.

SEO tools help with the parts of search optimization you control on your own pages: how a title and description read in results, which URLs crawlers may visit, how structured data describes a page and whether headings, links and images follow good practice.

Minifying removes the characters a browser or parser does not need, such as comments, indentation and line breaks, so files download faster.

A validator checks something against a rule before anything depends on it: markup with an unclosed tag, a stylesheet browsers will quietly ignore, an email that can never deliver, or a card number with a mistyped digit.

When a site will not load, email bounces after a DNS change, or a domain is about to lapse, you need an answer from outside your own network.

Social media mockup tools draw a picture of a post or a conversation so you can judge the wording and layout before anything is published, and one of them makes a text-on-gradient graphic sized for Instagram Stories.

Shrink a clip to fit an upload limit, cut out the dead air, join takes into one file, fix a sideways phone recording or pull the audio out as an MP3.