All tools

JSON Formatter

Format or minify JSON with clear error hints.

JSON Validator

Validate JSON and pinpoint syntax issues.

JSON String Escape

Escape plain text for use inside JSON strings.

Developer

YAML ⇄ JSON

Convert between YAML and JSON bidirectionally.

UUID Generator

Generate v4 UUIDs in batch.

UUID Validator

Check whether strings are valid UUIDs.

JWT Decoder

Inspect JWT header and payload (signature not verified).

Hash Generator

Compute SHA-1, SHA-256, and SHA-512 digests.

Password Generator

Generate strong passwords with customizable length and character types.

Regex Tester

Test patterns live with capture groups.

Cron Parser

Turn cron expressions into human-readable schedules.

HTML Formatter

Beautify or minify HTML markup.

XML Formatter

Beautify or minify XML documents.

SQL Formatter

Format or compact SQL (dialect in secondary field).

JavaScript Minifier

Beautify or minify JavaScript source.

CSS Minifier

Beautify or minify CSS stylesheets.

HTML Entity Encode/Decode

Encode or decode HTML entities.

Number Base Converter

Convert numbers between binary, octal, decimal, and hex.

HMAC Generator

Compute HMAC with a secret in the secondary input.

Color Converter

Convert among HEX, RGB, and HSL.

OpenAPI Validator

Validate OpenAPI 2.x/3.x structure (JSON or YAML).

JSON to TypeScript

Generate TypeScript interfaces from JSON.

gitignore Generator

Generate .gitignore templates by stack.

.env Parser

Parse or validate .env key/value files.

Semver Calculator

Bump or compare semantic versions.

Meta Tag Generator

Build SEO and Open Graph meta tags.

robots.txt Generator

Create robots.txt with optional sitemap URL.

Sitemap XML Generator

Build sitemap.xml from a list of URLs.

IBAN Validator

Validate international bank account numbers (MOD-97).

Credit Card Validator

Luhn check for test card numbers only — not for live payments.

Unit Converter

Convert length, weight, and temperature units.

Document

CSV ⇄ JSON

Convert between CSV and JSON.

PDF Merge

Merge multiple PDF files into one.

PDF Split

Split PDFs by page ranges.

PDF Compress

Reduce PDF size while keeping readability.

Excel to CSV

Export an Excel sheet to CSV on the server.

File Checksum

Compute MD5, SHA-1, or SHA-256 for uploaded files.

Image

Image Compress

Compress JPG, PNG, and WebP images.

Image Resize

Resize images to target dimensions.

QR Code Generator

Create QR codes from text or URLs.

QR Code Parser

Read QR content from an image.

Google Authenticator QR Converter

Convert Google Authenticator migration payloads to standard otpauth entries locally.

SVG Tool

Optimize SVG and convert to PNG/JPG — not a full vector editor.

Image Format Converter

Convert images between JPG, PNG, WebP, and AVIF.

Favicon Generator

Create a 32×32 PNG favicon from an image.

Text

Markdown ⇄ HTML

Lightweight Markdown and HTML conversion.

Diff Checker

Compare two texts with highlighted changes.

ASCII Art Generator

Turn short text into multi-font ASCII banners for README and CLI.

Text Case Converter

Switch letter case styles in bulk.

Lorem Ipsum Generator

Generate placeholder paragraphs.

Word Counter

Count words, characters, lines, and sentences.

Line Sort & Dedupe

Sort lines, remove duplicates, or both.

URL Slug Generator

Turn titles into URL-safe slugs.

Reading Time Calculator

Estimate reading time from word count and WPM.

Phone Number Formatter

Normalize phone digits to E.164-style output.

Network

Base64 Encode/Decode

Convert UTF-8 text to and from Base64.

URL Encode/Decode

Encode or decode URLs and query strings safely.

Timestamp Converter

Convert Unix time and ISO-8601 with time zones.

HTTP Request

Debug API requests with method, auth, headers, query, and body.

Timezone List

Browse and filter IANA time zones with current offsets.