Developer tools

Pretty-print, validate, or minify JSON.

Encode text to Base64 or back.

Percent-encode and decode URL strings.

SHA-1, SHA-256, SHA-384, SHA-512 hashes.

Generate v4 UUIDs (one or many).

Hex ↔ RGB ↔ HSL with live preview.

Binary ↔ octal ↔ decimal ↔ hex.

Inspect a JWT — header, payload, expiry.

Escape and unescape HTML entities.

Unix ↔ ISO ↔ human, in any timezone.

Make a QR code for any text or URL.

Cryptographically random passwords.

Decode any cron schedule into plain English.

Convert between CSV and JSON arrays.

Convert between JSON and YAML.

Test regular expressions live.

Check one or many addresses.

Convert images to base64 data URIs.

Compare two JSON documents.

Thousand separators, currency, scientific.

Generate TypeScript interfaces from JSON.

Generate complementary, analogous, triadic schemes.

Years, months, days from a birth date.

Body Mass Index, metric or imperial.

Monthly payment + amortization schedule.

Split a check with tip percentages.

See a time across multiple zones at once.

WCAG AA/AAA contrast ratio.

Build a CSS gradient with copy-ready code.

Visual CSS box-shadow editor.

Pick random items from a list.

Length, weight, volume, temperature.

25/5 work-break cycles.

Days/weeks/months between two dates.

% of a number, % change, tip, etc.

Convert between Roman and Arabic numerals.

Convert px to rem/em and back.

Visual border-radius designer.

Start, stop, lap.

Count down to a future moment.

Break a URL into parts.

Fake names, emails, addresses, IDs.

BMR, TDEE, and macro targets.

Basic + scientific functions.

Convert between JSON and XML.

Paste CSV, browse as a sortable table.

Visual CSS flexbox layout builder.

Visual CSS grid layout builder.

Strip whitespace and comments from HTML.

Strip whitespace and comments from CSS.

Pretty-print SQL across dialects.

Searchable reference for status codes.

Map file extensions to MIME types.

Make a CSS triangle from borders.

Final price after % off and tax.

Project savings or investment growth.

Extract data with JSONPath.

Char ↔ Unicode codepoint.

Add or count working days.

Unix permissions, octal ↔ symbolic.

Random integers in any range.

Flip a coin, roll dice.

Solve for the missing dimension.

IPv4 network info from a CIDR.

Spell numbers out in English.

Luhn checksum + brand detection.

Cubic bezier visual editor.

Frosted-glass CSS effect.

Pure-CSS loading spinner.

Score selectors by specificity.

HMAC-SHA1/256/384/512 over text.

Alphabetize JSON object keys.

Scrape an HTML table into JSON.

Hourly ↔ daily ↔ monthly ↔ yearly.

Weighted GPA across courses.