183 free developer tools.
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Convert between CSV and JSON formats

Bidirectional conversion between YAML and JSON

Bidirectional conversion between TOML and JSON

Bidirectional conversion between XML and JSON

Generate TypeScript interfaces from JSON samples

Generate Zod validation schemas from JSON samples

Generate Go structs with json tags from JSON

Generate Rust serde structs from JSON

Generate Kotlin data classes from JSON

Generate C# classes with System.Text.Json attributes from JSON

Generate Java classes with Jackson annotations from JSON

Generate GraphQL SDL types from JSON

Compare two JSON objects structurally

Generate JSDoc @typedef definitions from JSON

Convert CSV rows into SQL INSERT statements

Explain any SQL query in plain English, clause by clause

Convert between URL query params and JSON objects

Convert a JSON array of objects into CSV

Generate JSON Schema from sample JSON data

Generate sortable unique identifiers (ULID)

Generate v4 UUIDs in bulk with one-click copy

Generate and validate BIP39 mnemonic seed phrases

Generate 1D barcodes (Code128, EAN, UPC, and more)

Generate MD5, SHA-1, SHA-256, SHA-512 hashes

Generate HMAC digests with a secret key

Generate RSA or EC key pairs as PEM

Generate colored placeholder images at custom dimensions

Generate QR codes from text or URLs

Generate a QR code to join a WiFi network

Generate secure random passwords with crypto API

Generate placeholder text in paragraphs, sentences, or words

Upload an image and generate favicons with custom shape, border, and padding

Build cron expressions visually with dropdowns and presets

Check password entropy, strength, and crack time

Generate realistic fake/mock test data and export to JSON, CSV, or SQL

Generate real, valid sample/dummy files at an exact size

Generate secure API keys and secrets in various formats

Generate and verify bcrypt password hashes

Generate Apache .htpasswd entries with bcrypt or SHA

Generate and validate time-based one-time passcodes

Spell text using the NATO phonetic alphabet

Search emoji by name and copy with one click

Turn text into FIGlet-style ASCII art

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

Compare two texts and see highlighted differences

Test regular expressions with highlighted matches

Live count of characters, words, sentences, and reading time

Find and replace text with regex support

Escape and unescape strings for JSON, HTML, URL, and more

Inspect code points and UTF-8 bytes of any text

Sort lines alphabetically or numerically, remove duplicates

Convert any text to a URL-friendly slug

Turn text into fancy Unicode styles — bold, italic, cursive, and more

Flip your text upside down

Reverse text backwards or mirror it with flipped letters

Generate glitchy, cursed Zalgo text

Make fullwidth and spaced-out aesthetic / vaporwave text

Repeat any text N times with optional separators

Copy invisible Unicode characters for blank messages and names

Curated library of common regex patterns with one-click copy

Searchable ASCII character code reference

Paste JSON and explore all paths to values

Visual permission calculator for Unix

Select presets and generate a combined .gitignore

Parse .env files and convert between formats

Paste Tailwind classes and see equivalent CSS

Calculate dimensions from aspect ratios

Convert between B, KB, MB, GB, TB

Paste package.json to see a clean breakdown of dependencies and scripts

Generate RSA SSH key pairs in your browser

Build robots.txt files with user-agent rules and presets

Convert a docker run command to docker-compose.yaml

Scan npm lockfiles for known vulnerabilities (CVEs) via the OSV database

Build .htaccess files with redirects, security, caching, and more

Normalize emails and find duplicates

Generate an .editorconfig file from a form

Generate a table of contents from Markdown headings

Format, validate, and minify JSON

Prettify SQL queries

Format or compress HTML

Format or compress CSS

Format or compress JavaScript

Format or compress XML

Live side-by-side Markdown editor and rendered preview

Paste raw HTML and see it rendered in a sandboxed iframe

Build GitHub-flavored Markdown tables in a visual grid

Convert Markdown to clean HTML with live preview

Convert Markdown to a styled PDF document with customizable options

Convert HTML into clean, readable Markdown

Generate random TCP/UDP port numbers

Calculate network, broadcast, host range, and mask from CIDR

Expand a CIDR block or IP range into every address

Expand or compress IPv6 addresses

Generate random MAC addresses in any format

Search common TCP and UDP port numbers

Parse a User-Agent into browser, OS, and device

See your public IP address, location, and connection details

Look up DNS records for any domain (A, MX, TXT, NS, and more)

Encode and decode Base64 text and files

Encode and decode URI components

Decode JWT tokens and inspect header, payload, and expiration

Encrypt and decrypt text with AES-256-GCM and a password

Decode and inspect X.509 PEM certificates

Convert between decimal, hex, binary, and octal

Convert text to binary and back

Convert text to hexadecimal and back

Encode and decode Base32 (RFC 4648)

Encode and decode Base58 (Bitcoin alphabet)

Convert numbers to Roman numerals and back

Encode and decode HTML entities with named and numeric support

Generate and sign JWT tokens with HMAC algorithms

Compress images with adjustable quality

Convert images between PNG, JPEG, and WebP

Convert fonts between TTF, OTF, WOFF, and WOFF2

Resize images with aspect ratio lock

Convert SVG to PNG at 1x, 2x, or 3x scale

Optimize and minify SVG files

Convert images to base64 data URLs and vice versa

View dimensions, file size, and EXIF data

Upload an image and click to pick colors

Compress, resize, and convert multiple images at once

Chain resize, format, and compress operations on a single image

Convert an image into a multi-resolution .ico favicon

Upload an image and extract its dominant colors

Turn code snippets into beautiful images with gradient backgrounds

Convert SVG markup into React/JSX components

Generate marketing-style App Store screenshots with device frames

Combine multiple PDF files into one

Split a PDF into multiple files

Rotate pages in a PDF

Add a signature to a PDF

Rearrange pages in a PDF by dragging and dropping

Delete specific pages from a PDF

Extract specific pages from a PDF into a new file

Convert images to a multi-page PDF document

Convert PDF pages to PNG or JPEG images

Add page numbers to every page of a PDF

View and edit PDF metadata like title, author, and keywords

Chain multiple PDF operations: remove, rotate, add page numbers

Reduce PDF file size in your browser — lossless or strong compression

Convert between hex, RGB, HSL, and OKLCH

Generate harmonious color palettes from a base color

Check WCAG AA/AAA contrast ratios

Visual gradient builder with CSS output

Generate custom shadcn/ui themes with OKLCH color variables

Simulate how images and colors look with different types of color blindness

Build CSS box-shadows visually with layered shadows

Drag a curve to build a CSS easing function

Generate fluid clamp() font sizes

Round corners visually and copy the CSS

Build Flexbox and CSS Grid layouts visually

Generate iOS-style squircle (superellipse) shapes

Generate glassmorphism and neumorphism CSS

Convert between Unix timestamps and human-readable dates

Break a URL into its components

Searchable list of HTTP status codes

Generate HTML meta tags, Open Graph, and Twitter Card tags

Parse cron expressions into human-readable descriptions

Convert a list of Unix timestamps to human-readable dates

Convert a date and time between time zones

Time and business days between two dates

Convert a date between ISO, Unix, RFC, and more

Live countdown to any future date

Preview Open Graph and Twitter Card meta tags with live social previews

Build Content Security Policy headers with a visual form

Send test POST requests to webhook endpoints and inspect responses

Send HTTP requests and inspect responses — a lightweight online API client

Evaluate math expressions with functions and constants

Calculate percentages, ratios, and percent change

Convert length, mass, temperature, and speed

Full SEO audit: paste one URL for a 0–100 score and prioritized fixes across meta, content, links, images, structured data, social, and security headers

Analyze any webpage's meta tags, Open Graph, and Twitter Card data

Check any page's heading hierarchy for SEO issues

Analyze all internal and external links on any webpage

Check images on any webpage for missing alt text and SEO issues

Validate JSON-LD structured data on any webpage

Detect what technologies any website is built with

Follow the full redirect chain for any URL

Run a full SEO analysis on any URL — meta tags, headings, links, images, and structured data, all on one page

Analyze HTTP response headers and grade security headers

Generate JSON-LD structured data for any schema.org type

Analyze keyword and phrase frequency in any text

Generate a valid XML sitemap from a list of URLs