One hundred small utilities

ASCII Banner

Turn a short phrase into big block letters for a console splash or a comment.

Case Converter

camelCase, snake_case, kebab-case, Title Case, and eleven more, one click each.

Find and Replace

Several find and replace rules over one block of text, plain or regular expression.

Line Tools

Sort, dedupe, number, trim, wrap, reverse and shuffle a list of lines.

List Compare

Two lists in, and the answer to what they share, what is missing, and what repeats.

Lorem Ipsum

Placeholder copy in classic Latin or plain English, by word, sentence, or paragraph.

Markdown Preview

Write Markdown on the left, see it rendered on the right, take the HTML with you.

Post Length Checker

Counts your post against the limit on every platform, links and emoji included.

Regex Tester

Run a pattern against sample text with live highlighting and capture groups.

String Similarity

How close two pieces of text are, by five different measures.

Table Formatter

Paste rough columns and get a tidy Markdown, ASCII or HTML table back.

Template Filler

One template plus a table of data gives you a filled copy for every row.

Text Cleaner

Straighten curly quotes, strip invisible characters and undo mangled accents.

Text Diff

Compare two blocks of text line by line, or word by word inside a line.

Text Extractor

Pull every email address, link, phone number or figure out of a wall of text.

Text Redactor

Mask the addresses, numbers and keys out of a log before you share it.

Text Stats

Counts, reading time, readability grade, and the words you lean on most.

Word Descrambler

Find every word hiding in a pile of letters, with blanks and pattern matching.

Wordle Solver

Enter the colors the board gave you and see every word still possible.

CSS Formatter

Lay a stylesheet out on readable lines or squash it, and see what it contains.

CSV Converter

Paste a spreadsheet and get JSON, or feed it JSON and get a clean CSV back.

cURL to Code

Paste a curl command and get it back as fetch, Python, C#, Go or PowerShell.

HTML to Markdown

Paste a chunk of a web page and get clean Markdown, structure and all.

JSON Diff

Compare two JSON documents by shape, not by line, and see which keys moved.

JSON Formatter

Pretty-print, minify, sort keys, and get the exact line where parsing broke.

JSON Query

Pull one value out of a large document with a dotted path, and browse every path in it.

JSON to Code

Generate C# records, TypeScript interfaces, Python or Go types from sample JSON.

Meta Tag Builder

Write a page title and share card once, see it, and copy the finished tags.

SQL Formatter

Lay a query out on readable lines, or squash it back down to one.

Test Data Generator

Make believable rows of people, dates and numbers as JSON, CSV or SQL.

XML and JSON

Turn XML into JSON or JSON into XML, with attributes and text nodes handled.

YAML and JSON

Turn YAML into JSON or JSON into YAML, nesting, lists and block text included.

Base64 Converter

Encode and decode text or files, standard or URL-safe alphabet.

Cipher Tools

ROT13, Caesar, Atbash, Vigenere and rail fence, with a shift-cracking helper.

Data URI Builder

Wrap a small file up as a data: URI, with the line of CSS or HTML to use it.

Escape Tool

Escape and unescape text for HTML, JavaScript, JSON, XML, CSV, SQL, shell and regex.

Morse Code

Translate either direction and hear it played back at the speed you choose.

Punycode and IDN

International domain names to their xn-- form and back, label by label.

Symbol Finder

Search hundreds of arrows, math signs, currencies and emoji, then copy one.

Unicode Inspector

Break text into code points, see the invisible ones, and get every escape form.

URL Inspector

Percent-encode, decode, and take a URL apart into its query parameters.

Aspect Ratio

Scale a width or height while keeping the shape, and name the ratio you have.

Base Converter

Binary, octal, decimal, hex and every base to 36, with a bit board and bitwise math.

Expression Calculator

A notepad that adds up, one sum per line, with names you can reuse below.

Fraction Calculator

Add, subtract, multiply and divide fractions, and turn any decimal into one.

Geometry Calculator

Area, perimeter, surface and volume for fifteen shapes, formula included.

Loan Calculator

Monthly payment, total interest, and the full month-by-month payoff schedule.

Number Names

Spell a number out in words, as an ordinal, as currency, or in Roman numerals.

Odds and Combinations

How many ways and how likely: combinations, dice totals, coin flips and birthdays.

Percentage Calculator

Every percentage question at once: of, out of, change, markup, tip and tax.

Prime and Factors

Break a number into its primes, list every divisor, and find a GCD or LCM.

Random Picker

Roll dice, flip coins, draw numbers, shuffle a list, or split a crowd into teams.

Savings Calculator

What regular saving turns into once compound interest has done its work.

Statistics Calculator

Mean, median, quartiles, standard deviation and a histogram from a pasted column.

Unit Converter

Length, mass, volume, area, speed, temperature, data, time, pressure, energy.

Cron Explainer

Read a cron expression back in English and list the next times it fires.

Date Calculator

Days between two dates, add or subtract a duration, count working days, find an age.

Duration Calculator

Add up a column of times, do sums on them, and convert one into every format.

Stopwatch and Timer

A stopwatch with laps, a countdown with an alarm, and a pomodoro cycle.

Sunrise and Sunset

Sunrise, sunset, golden hour and twilight for any place and any date.

Time Zone Planner

Line up several cities side by side and find the hour that suits everyone.

Timesheet Calculator

Clock in, clock out, take off the breaks, and get the week with its overtime.

Timestamp Converter

Move between Unix time, ISO 8601, and human dates across any time zone.

Box Shadow Generator

Stack CSS box shadows layer by layer and copy the finished rule.

Color Studio

Convert between HEX, RGB, HSL, build tints and shades, and check WCAG contrast.

Color Blindness Check

See a palette the way one man in twelve does, and find the pairs that merge.

Color Mixer

Blend two colors and watch each color space take a different route.

Contrast Grid

Every color against every other, with the ratio and whether it passes.

EXIF Viewer

See the camera, settings, date and GPS your photos are quietly carrying.

Favicon Generator

A picture, letter or emoji turned into every icon size a site asks for.

Gradient Generator

Build a linear, radial or conic CSS gradient and copy the exact rule.

Image Color Picker

Pull the exact color from any pixel of an image, and pull out its palette.

Image Resizer

Resize, crop, rotate and re-encode a picture without it ever leaving your machine.

Image to ASCII

Turn a photo into text art for a README or a terminal, all in your browser.

OKLCH Converter

Every CSS color notation from one color, and why the newer ones behave.

Palette Generator

A whole color scheme from one starting color, with CSS or Tailwind to copy.

Placeholder Image

The gray box with the size on it, as an SVG or PNG, made here not fetched.

Theme Generator

One brand color into a full set of light and dark tokens, contrast checked.

Certificate Decoder

Read a PEM certificate: who it is for, who signed it, and when it expires.

Hash Generator

SHA-1, SHA-256, SHA-384, SHA-512, MD5 and CRC32 over text or a dropped file.

HMAC Generator

Sign a payload with a secret key and check the signature a webhook sent you.

HTTP Header Check

Paste response headers and see what they do, what is missing, and how they cache.

ID Validator

Check the check digit on an ISBN, IBAN, VIN, EAN, IMEI or card number.

JWT Decoder

Split a token into header, payload, and signature and read the claims.

Password Generator

Random strings and passphrases from the browser crypto engine, scored as you go.

SSH Key Fingerprint

The SHA256 and MD5 fingerprints of a public key, with its randomart picture.

Text Encrypt

Lock a note with a passphrase using AES-GCM, and unlock it again later.

TOTP Codes

The six digit codes an authenticator app would show, worked out from the secret.

Barcode Generator

Code 128, EAN-13 and UPC-A barcodes, with the check digit worked out for you.

GUID Generator

Batch out RFC 4122 v4 or v7 identifiers in the format your code expects.

QR Generator

Turn a link, note, or Wi-Fi login into a QR code and save it as PNG or SVG.

Resistor Color Code

Read the bands off a resistor, or find the bands for the value you need.

Short ID Generator

Nano IDs, ULIDs and short codes, with a decoder for the ones carrying a time.

Browser Info

Everything a website can tell about your browser, screen and machine.

Chmod Calculator

Tick the permissions you want and read off the octal, or go the other way.

Developer Lookup

HTTP status codes, MIME types, port numbers and headers, all searchable.

Hex Viewer

Dump any file as hex and text side by side, and find out what it really is.

Line Endings

CRLF or LF, byte order marks, tabs and trailing spaces, found and fixed.

Subnet Calculator

Work out network, broadcast and host range from a CIDR block, then split it up.

User Agent Parser

Which browser, engine, system and device a user agent string claims to be.