Dev toolbox

Developer tools

Twenty-two focused utilities that run entirely in your browser. No sign-up, no uploads, no server ever sees your data.

100% client-side

Formatting & validation

JSON formatter & validator

Pretty-print, minify and validate JSON with precise error positions.

XML formatter & validator

Indent, minify and well-formedness-check XML documents.

JWT decoder & validator

Decode header and payload, inspect claims and check expiry.

SQL formatter

Format queries across PostgreSQL, MySQL, SQLite, BigQuery and more.

Regex tester

Test regular expressions live, with highlighted matches and capture groups.

Generators

UUID generator

Generate random v4 or time-ordered v7 UUIDs in bulk.

CPF generator

Generate structurally valid Brazilian CPF numbers for testing.

CNPJ generator

Generate numeric CNPJs and the new alphanumeric format for testing.

Password generator

Build strong passwords with full control over length and character sets.

Lorem ipsum generator

Generate placeholder text by paragraphs, sentences or words.

Fake data generator

Generate believable people: names, emails, phones and addresses.

Document validators

CPF validator

Check a Brazilian CPF's check digits with a step-by-step breakdown.

CNPJ validator

Validate numeric and new alphanumeric CNPJs, with the maths shown.

Converters

Base64 encoder & decoder

Encode and decode Base64, including the URL-safe variant.

Unix timestamp converter

Convert Unix timestamps to readable dates and back, in UTC or local time.

Color converter

Convert between HEX, RGB and HSL with a live preview.

URL encoder & decoder

Percent-encode and decode URLs, with a query string breakdown.

Markdown preview

Render Markdown to HTML side by side, and export the markup.

Analysis & comparison

Text diff

Compare two texts and highlight every addition and removal.

List analyzer

Count totals, uniques and duplicates in a pasted list.

Character & word counter

Count characters, words, sentences and reading time as you type.

Other

QR code generator

Turn any text or URL into a downloadable QR code.