Tools

Text & Code

Case Converter

Convert text to UPPERCASE, lowercase, Title Case, Sentence case, and more.

HTML Formatter

Beautify, format, or minify your HTML code online with customizable indentation.

JSON Formatter & Validator

Format, validate, beautify and minify JSON with custom indentation and precise error locations.

Regex Tester

Test regular expressions live with match highlighting, capture groups and flag toggles.

Diff Checker

Compare two texts or code snippets line-by-line with added/removed highlighting.

CSV ↔ JSON Converter

Convert CSV to JSON and back, with quoted fields and custom delimiters.

Slug Generator

Turn any title into a clean, URL-safe, SEO-friendly slug.

Word & Character Counter

Live word, character, sentence counts plus reading time and keyword density.

Lorem Ipsum Generator

Generate placeholder text by paragraphs, sentences or words for mockups.

YAML ⇄ JSON Converter

Convert YAML to JSON and back with live validation and error locations.

JSON → TypeScript Types

Paste JSON, get clean TypeScript interfaces with nested types, optional detection and one-click copy.

cURL → Code Converter

Paste any cURL command, get ready-to-run fetch, axios and Python requests code.

Markdown ⇄ HTML Converter

Convert Markdown to HTML live, or HTML back to Markdown, with copy buttons for both.

Query String Builder

Add key/value pairs and get a formatted URL query string — encodes components and preserves order.

HTML Entity Encoder/Decoder

Encode special characters to HTML entities and decode them back, with named and numeric output.

Unicode & Emoji Converter

Inspect any character: code point, UTF-8 bytes, HTML entity, URL escape, and grapheme-aware splitting.

Morse & Roman Numeral Converter

Text ⇄ Morse code and numbers ⇄ Roman numerals, with reference tables and copy buttons.

Line Cleaner & Sorter

Remove duplicate lines, trim whitespace, remove empties, and sort A→Z, Z→A or by length.

Readability Analyzer

Flesch reading-ease score, grade level, reading time and top keyword density, computed live.

SQL Formatter

Beautify SQL queries: uppercased keywords, newline before major clauses, 2-space deep block indent.

Encoding & Security

Base64 Encoder / Decoder

Unicode-safe Base64 encoding and decoding right in your browser.

URL Encoder / Decoder

Percent-encode query components or full URLs — and decode them back.

Hash Generator

Generate SHA-1/256/384/512 hashes locally via the Web Crypto API.

JWT Decoder

Decode JWT header and payload claims and check expiry — nothing is uploaded.

Password Generator

Create strong random passwords with custom length and character sets.

JWT Encoder

Create signed JWTs (HS256/384/512) from header/payload JSON — signing happens locally via WebCrypto.

HMAC Signature Calculator

Compute HMAC-SHA256/384/512 signatures for a message with any secret — WebCrypto, fully local.

Sensitive Data Scanner

Scan pasted text for emails, credit cards, API keys and tokens with regex pattern matching — fully local.

GitHub Token Checker

Paste a GitHub PAT to inspect its prefix, format, scopes and expiration — validation is local, no API calls.

Password Strength Meter

Entropy estimate, crack-time scenarios, character variety and detection flags — never leaves your browser.

RSA Keypair Generator

Generate RSA-OAEP 2048/4096 keypairs as PEM via WebCrypto — keys never leave your browser.

Design & CSS

Color Converter

Convert colors between HEX, RGB and HSL with a visual picker.

CSS Gradient Generator

Build linear or radial gradients visually and copy the CSS in one click.

Box Shadow Generator

Design multi-layer CSS box shadows with sliders and a live preview box.

Contrast Checker

Check color contrast against WCAG AA and AAA accessibility standards.

SVG Viewer / Optimizer

Preview SVG markup safely and minify it by stripping comments and whitespace.

Color Scheme Generator

Complementary, analogous, triadic, tetradic and monochromatic palettes from any base color.

HEX Alpha Converter

Convert #RRGGBBAA hex-with-alpha to rgba()/hsla() and back, with a live preview swatch.

Type Scale Generator

Build a modular type scale with any ratio (1.125–1.618) and copy the CSS custom properties.

Cubic Bézier Curve Generator

Drag two handles to shape a cubic-bezier() easing curve and copy the CSS timing function.

Color Blindness Simulator

Simulate protanopia, deuteranopia, tritanopia and achromatopsia on any color or palette.

Flexbox & Grid Playground

Toggle every flexbox/grid property live, see the CSS, copy it — interactive preview boxes included.

Converters & Generators

Timestamp Converter

Convert Unix timestamps to dates and back, in seconds or milliseconds.

Number Base Converter

Convert between binary, octal, decimal and hexadecimal instantly.

Cron Expression Explainer

Explain cron expressions in plain English and see the next run times.

UUID Generator

Generate random UUID v4 identifiers in bulk with formatting options.

Placeholder Image Generator

Create placeholder PNG images in any size and color for mockups.

Business Days Calculator

Add/subtract N business days from a date, or count business days between two dates, with holiday exclusion.

Timezone Converter

Pick a date/time and see it in 10+ time zones at once using the Intl API — no server needed.

Percentage Calculator

Every percent problem in one place: X% of Y, percent change, split tips and discount prices.

EMI Loan Calculator

Monthly EMI, total interest and total payment with a per-year amortization breakdown table.

Unit Converter

Length, weight, temperature, data and area conversions in one place, with smart significant digits.

Number Theory Calculator

GCD, LCM, prime checks, factorization and divisibility for integers — all instant.

Barcode Generator

Generate Code 128 barcodes on canvas with adjustable size and PNG/SVG download.

Images & Mobile

Image Compressor

Compress photos as JPEG or WebP with a quality slider — fully offline.

App Icon Resizer

Turn one icon into every Android mipmap and iOS AppIcon size as a ZIP.

Favicon Generator

One PNG or SVG to favicon.ico, apple-touch-icon and PWA sizes as a ZIP download — via Canvas.