Categories
Browse tools by category
A category answers “what kind of tool is this?”. Each one below collects the tools for a single kind of work, and shows how many have shipped so far.
Every category
Developer
Format, validate, encode and debug without leaving the browser.
27 tools
Finance
Loans, interest, tax and investment maths, worked out clearly.
9 tools
Converters
Move between units, file types and data formats in one step.
10 tools
SEO
Meta tags, Open Graph cards, canonicals, robots.txt and sitemaps.
6 tools
Text
Count words, characters, sentences and reading time as you type.
1 tool
Image
Compress photos and generate placeholders, entirely on your device.
2 tools
Color
Convert between colour spaces and build CSS gradients visually.
3 tools
Security
Hashes, passwords and JSON Web Tokens, generated locally.
5 tools
Categories, or collections?
A category is about the tool: a formatter belongs with the formatters. A collection is about the task: the tools you open in sequence to get one job done, wherever they happen to sit in the catalogue.
If you know what kind of tool you want, start here. If you know the outcome but not the tool, start with collections.
Why a category can be missing
Only categories with tools you can open are listed. A category appears the day its first tool ships, so nothing here leads to an empty page.