Format, minify, and validate JSON with line-and-column error reporting

Validate JSON syntax and pinpoint the failing line and column

Explore JSON as a collapsible tree and read off access paths

Escape and unescape JSON strings

Beautify SQL per dialect, including MySQL and PostgreSQL

Pretty-print or minify XML while checking that every tag is closed

Validate YAML syntax and normalize the indentation

Pretty-print HTML with real indentation, or minify it safely

Format and minify CSS, with SCSS and Less support

Format JavaScript, or minify and mangle it

Preview Markdown live and export the generated HTML

Validate TOML and emit a normalized version

Format GraphQL queries and schema definitions

Check a Dockerfile against common best practices

Re-indent Nginx configuration block by block

Convert JSON to YAML while preserving the nesting

Convert YAML to JSON, multi-document files included

Convert a JSON array of objects to CSV, with nested fields flattened automatically

Convert CSV to JSON with automatic header and delimiter handling

Infer TypeScript type definitions from JSON

Convert JSON to Go structs with json tags filled in

Convert JSON to Python dataclasses or Pydantic models

Convert JSON to Java classes, with optional Lombok annotations

Convert JSON to XML with a custom root element name

Convert XML to JSON without losing attributes or text nodes

Convert between JSON and TOML in both directions

Convert Markdown to clean, semantic HTML

Convert HTML to Markdown, with tables emitted as GFM pipe syntax

Convert HTML to JSX, rewriting attributes and inline styles

Turn a cURL command into request code in 7 languages

Map CSS declarations onto Tailwind utility classes

Convert SVG into a React component with props forwarded

Convert an Excel spreadsheet to JSON without uploading the file

Convert a database client result table to JSON

Convert a JSON array into INSERT statements

Normalize line endings by converting between CRLF, LF, and CR

Encode and decode Base64, with UTF-8 and URL-safe support

Convert files to Base64 and data URIs — nothing is uploaded

Percent-encode URLs, with separate modes for full URLs and parameter values

Escape and unescape HTML entities

Convert between text and hex with several separator styles

Escape and unescape Unicode in three notations

Compute SHA-1/256/384/512 and MD5 digests

Compute MD5 online and get the 32-character digest

Compute SHA-256 online, backed by Web Crypto

Generate HMAC signatures with SHA-1 through SHA-512

Generate bcrypt hashes and verify passwords against them

Inspect JWT header and payload claims and check expiry

Generate JWTs and verify HMAC signatures

AES encryption and decryption with PBKDF2 key derivation

Generate RSA key pairs in PEM format

Generate an HTTP Basic authentication header

Decode X.509 certificates to inspect validity and SANs

Assess password strength and get concrete improvements

Compute CRC32 checksums, matching zip and gzip

Translate between Morse code and text

ROT13 and Caesar cipher with an adjustable shift

Generate UUID v4 or v7 in bulk, with optional hyphen removal

Generate ULIDs and decode the timestamp embedded in each one

Generate NanoIDs at an adjustable length

Generate ObjectIds and decode their timestamps

Generate strong random passwords with a configurable character set

Generate random strings in bulk from a character set of your choice

Generate Latin or Chinese placeholder text by paragraph or sentence

Generate Chinese test data and export it as JSON, CSV or SQL

Generate mock data from a JSON Schema

Generate a JSON Schema from a JSON sample

Generate QR codes for URLs, WiFi networks and contact cards

Generate barcodes in 8 encoding formats

Build a .gitignore by combining the stacks you use

Generate open source license text and see how the terms differ

Generate SVG placeholder images and data URIs

Compare two blocks of text line by line, optionally ignoring whitespace

Compare two JSON documents structurally, by key path

Test regex matches live and inspect every capture group

Convert identifiers between camelCase, snake_case, kebab-case, and more

Count words, characters, lines, and estimated reading time

Count AI tokens and estimate what a call will cost

Remove duplicate lines, optionally ignoring case and whitespace

Sort lines of text, with natural and random ordering

Escape strings for a specific target language

Generate URL slugs, with optional Chinese-to-pinyin conversion

Build a table of contents from Markdown headings

Compare locale files to find missing and empty keys

Convert Chinese to pinyin, with word-aware heteronym handling

Convert Unix timestamps to dates and back, seconds or milliseconds

Compare a time across several zones, daylight saving handled for you

Calculate the gap between dates, including business days

Parse cron expressions and preview the next run times

Convert between binary, octal, decimal, and hexadecimal

Convert storage units, keeping base 1024 and base 1000 apart

Convert length, weight, area, volume, and speed

Turn millisecond durations into readable text and ISO 8601

Convert between Roman and Arabic numerals

HTTP status code reference with likely causes and where to look

Break a URL into its components and query parameters

MIME type and file extension reference

Parse a User-Agent string into browser and OS details

CIDR subnet calculator with membership checks

Inspect response headers and security header coverage

DNS record lookup across 8 record types

See your public IP and look up registration data for any IP

SSL certificate checker: expiry, chain, and TLS version

Generate Open Graph and Twitter Card tags

Generate robots.txt, including AI crawler rules

Convert between JWK and PEM public keys

Connect to and debug WebSocket endpoints online

Analyze HAR files to find slow requests and large assets

Common port reference with exposure risk warnings

Compress images in your browser — no uploads

Convert between PNG, JPEG, WebP, and AVIF

Resize images to exact dimensions, with optional aspect lock

Turn images into data URIs with ready-to-use snippets

Generate multi-size icons and a favicon.ico

Strip SVG cruft without touching path data

Inspect EXIF data and export a metadata-free copy

Convert between HEX, RGB, HSL, and CSS custom properties

Build tints, shades, and color schemes from one base color

Check text and background contrast against WCAG thresholds

Create linear, radial, and conic CSS gradients

Dial in CSS box shadows visually

Calculate responsive clamp() expressions