A focused toolkit for everyday development.

Convert cURL to HTTP client code

Convert between JSON arrays and CSV

Convert between YAML and JSON

Convert between TOML config and JSON

Convert between XML documents and JSON

Generate TypeScript, Go, and Python types from a JSON sample

Convert HEX/RGB/HSL and check WCAG ratios

Convert and compare bases from 2 to 36

Convert length, area, weight, data size and more at once

Convert Unix time and dates across many representations

Compare one moment across cities worldwide

Build cron expressions and check what they mean

Evaluate expressions and keep the history

Trigonometry, logarithms, degrees and radians

Count down and chime when the time is up

Measure to a hundredth of a second and record laps

Announce the time with a 117-style voice or chime

Watch the current time in cities side by side

Compute durations and add or subtract from a date

Encode and decode Base64 with full UTF-8 support

Percent-encode and decode URLs and query values

Escape and unescape HTML special characters

Verify JWT signatures and standard claims

Sign messages with a shared secret

Generate and inspect Basic auth headers

Escape strings for JSON, JS, SQL and regex

Validate and pretty-print JSON

Pretty-print SQL with keyword casing

Indent and pretty-print XML documents

Normalise and re-indent YAML

Re-indent CSS blocks for reading

Indent HTML markup

Generate v1/v4/v7, ULID and name-based (v3/v5) IDs

Generate dummy names, addresses and more as JSON/CSV/SQL

Generate secure passwords by length and character set

Generate Lorem Ipsum and Japanese filler text

Generate Shields.io and Badgen.net badges for READMEs

Browse, search, inspect, and randomly generate Unicode emoji

Browse, search, copy, and build Japanese emoticons from parts

Convert text into bold, script, circled, and other Unicode styles

Calculate SHA hash digests of text

Generate a QR code from text or a URL and save it

Run JavaScript/TypeScript in the browser with stdin/stdout

Inspect matches and capture groups

Extract with JSONPath and validate against JSON Schema

Run CSS selectors and XPath against HTML

Check which paths a glob pattern matches

Build X search queries and jump to the results

Compose search operators and jump to Google

Build Gmail search queries from senders and filters

Build repository, code and issue search queries

Analyze garbled text and restore the original characters

Detect and visualize whitespace, zero-width, and direction controls

Convert alphanumerics, symbols, katakana, and spaces between widths

Analyze text and convert its case

Compare differences between two texts

Sort, deduplicate and wrap lines in one pass

Safely preview Markdown

Edit and preview diagrams written in Mermaid

Convert images to and from Base64 Data URLs

Strip cruft and emit a CSS-ready data URI

Convert to WebP/AVIF and shrink the file

Batch convert to PNG, JPEG, WebP or AVIF

Shrink several images at once, keeping their format

Sketch in the browser and save it as a PNG

Knock out a colour and export a transparent PNG

Turn iPhone HEIC photos into JPEG or PNG

Inspect capture and location data, then strip it

Calculate IPv4 network ranges

Calculate IPv4/IPv6 CIDR ranges, containment and splits

Inspect URL components and query parameters

Inspect a domain and web page in one request

Look up a domain registrar, dates and status

Preview Open Graph and X Card tags for a page

Audit titles, headings, canonical tags and more

Inspect the connection details your browser exposes

Search 1xx-5xx status codes with bilingual notes and RFC references

Read latitude, longitude and accuracy from your device

Capture a photo from your webcam and save it as PNG

Scan QR codes and barcodes with your camera

Inspect screen, battery, CPU and other browser details