Type what you need.

Create QR codes as SVG from text or URLs with customizable size

Count characters, words, sentences, paragraphs, and more

Convert between Unix timestamps and human-readable dates

Convert hex color codes to RGB (red, green, blue) values

Compare two texts and highlight word-level differences

Explain cron expressions in human-readable form

Calculate percentages

Convert between temperature scales

Convert between 12-hour and 24-hour time formats

Alcohol by volume from original and final gravity

Convert acceleration between metric, imperial and standard gravity units

Flags -ly adverbs and adverb-verb pairs that lean on a weak verb, and scores how dense they are; a suggestion, not a rule, since adverbs are not banned

Compute exact age from birthdate

Convert an oven time and temperature to air fryer settings, or an air fryer setting back to an oven one

Convert any color to hex, RGB, HSL, HSV, and CMYK formats

Finds runs of three or more words sharing an initial letter, skipping small connecting words, as a description rather than a correction

Generate adjacent colors on the color wheel from any hex, RGB

Convert between angle units

Work out tank volume, water weight and a rough stocking guide from tank dimensions

Create smooth area charts as SVG from data series with customizable

Convert between area units

View ASCII character codes with decimal, hex, octal

Look up ASCII 0-127 and the printable Latin-1 Supplement (160-255) in decimal, hex, octal and binary

Encode text to Ascii85 or decode it back, in either the Adobe variant wrapped in <~ ~> or the plain, undelimited btoa variant

Calculate display ratios, GCD

Convert distance between kilometres, astronomical units, light years and parsecs

Work out your attendance percentage so far, and how many more sessions you can miss and still hit a target

For fun: a seeded aura colour with its traditional meaning and a hex value, so a swatch can be shown

Create horizontal or vertical bar charts as SVG from labels

Decode base64-encoded image data back to viewable images

Expand a bash brace pattern such as file{1..3}{a,b}.txt into the full list of results, with a count and a warning if the list is very large

Work out how many beads a design needs from its grid size and coverage, and how many packs to buy

Work out the initial bearing, back bearing and great circle distance between two latitude/longitude points

For fun: physical, emotional and intellectual biorhythm cycles for a target date, worked out as sine waves from a birth date

Perform bitwise operations

Estimate blood alcohol concentration from units drunk, body weight, sex and time elapsed using the Widmark formula, against the UK and Scottish drink drive limits

Prettify and format JSON with configurable indentation

Generate secure random passwords

Convert text to Base64 format

Decode JWT tokens into header, payload, and signature

Create cryptographically random UUID version 4 identifiers

Percent-encode text using standard encodeURIComponent encoding

Compute MD5 digests

Create EditorConfig files with indent style, charset, line endings

Create environment variable templates for Next.js, React, Node.js

Parse dotenv files into structured JSON with variable names, values

Check dotenv files for syntax errors, duplicate keys

Toggle checkboxes to build a .gitignore file for your project

Create .gitignore files for Node.js, Python, Java, Go, Rust, Ruby

Compute Adler-32 checksums

Decrypt AES-GCM ciphertext

Encrypt text with AES-GCM

Convert numbers between any bases (2-36)

Generate secure random API keys

Create realistic mock JSON data from JSON Schema or sample data

Pretty-print JSON and XML API responses with configurable indentation and optional key sorting

Create box, table, tree, and flow diagrams as ASCII art

Transform AsciiDoc headers, formatting, links, lists

Create valid Atom 1.0 XML feeds with entries, authors, and metadata

Paste Atom XML and get structured JSON with feed metadata, entries

Pretty-print and validate Apache Avro schema JSON

Inspect base64-encoded Avro binary data

Break down Amazon Resource Names into partition, service, region

Create Babel configuration for browser, Node.js

Create shields.io badge markdown for npm, GitHub, license

Encode text to Base32 or decode Base32 back to text

Encode or decode text using Bitcoin-style Base58 encoding

Encode or decode text using Base62 alphanumeric encoding

Convert Base64 encoded strings back to plain text

Decode URL-safe Base64 encoded strings back to text

Encode text to URL-safe Base64 format

Auto-detect and minify JavaScript, CSS, HTML, JSON, XML, or SQL code