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Online JSON formatter with syntax validation and pretty-print, Chinese-friendly

Convert text or files to/from Base64 online

Generate 32/16-bit MD5 digest

Beautify & minify JS, supports template strings and regex

Count characters, words, lines, paragraphs and bytes

Real-time regex matching with highlight and error hints

Compress images locally with quality 1-100

Convert between time and millisecond timestamps

Domain registration info via standard RDAP protocol

Online JSON formatter with syntax validation and pretty-print, Chinese-friendly

Tree view JSON explorer with collapsible nodes

Remove whitespace, escape strings, unescape support

Convert JSON to XML and back, preserving structure

Bidirectional conversion with nested arrays support

Generate Java / TS / Go classes from JSON

Convert text or files to/from Base64 online

RFC 3986 URL percent-encoding

Convert Chinese to/from \uXXXX escape sequences

Convert < > & HTML entities

Convert between base 2/8/10/16/64

Convert full-width characters to half-width and vice versa

Generate 32/16-bit MD5 digest

SHA1 / SHA256 / SHA512 hash generator

AES/DES symmetric encryption with AES-128/256 CBC modes

RSA online encryption with 2048/3072/4096-bit key generation

Morse code converter for letters, numbers and punctuation

Generate UUID v4 random, v1 timestamp, v7 sortable

Beautify & minify JS, supports template strings and regex

Beautify & minify CSS with media query nesting

Format SQL for MySQL/Oracle dialects

Beautify & minify XML with attribute normalization

Beautify & minify HTML with smart tag indentation

PEP8-style Python code beautifier and minifier

Count characters, words, lines, paragraphs and bytes

Remove duplicate lines, ignore case and blank lines

Sort lines ascending/descending with natural number sort

Reverse characters, lines, inline and words

Find and replace with plain text or regex modes

Validate 18/15-digit Chinese ID and parse birth date, gender

Parse IPv4/IPv6, detect public/private/loopback

Reference for common HTTP 1xx-5xx status codes

Identify browser, OS, device type and engine from UA

DNS records lookup: A, AAAA, CNAME, MX, TXT, NS, SOA

Connect to ws/wss endpoints and exchange messages

Real-time regex matching with highlight and error hints

Compress images locally with quality 1-100

Convert PNG / JPEG / WebP, keep transparency

Crop images with 1:1 / 4:3 / 16:9 presets

Add text or logo watermarks with grid positioning

Convert images to/from Base64 DataURL

Read photo metadata: camera, aperture, shutter, ISO, GPS

Split an animated GIF into static frames (PNG/WebP/JPEG), preview frame by frame, downloa…

Make animated GIFs from multiple images online - add, remove, replace, reorder or insert …

Convert between time and millisecond timestamps

Visual cron expression generator and parser

Generate TypeScript interfaces from JSON

Convert to camelCase, PascalCase, snake_case, kebab-case

Generate Java / C# / TypeScript entities from CREATE TABLE

Side-by-side line diff with add/delete highlight

Domain registration info via standard RDAP protocol

Parse robots.txt rules and test URL crawl permissions

Generate full-page website screenshots

Generate SEO meta tags with OG, Twitter Card and JSON-LD

Reference table of 68 common service ports

Run Python 3 in browser with Pyodide, no install

Run JavaScript in the browser locally, console output and async/await supported

Compile and run Java with JDK 21, supports stdin and class examples

Compile and run Go 1.22, supports stdin, slices and structs

Compile and run C++ with GCC 13

Execute Bash scripts online

Merge multiple PDF files into one online for free, reorder freely, processed locally in y…

Extract specific pages from a PDF online - by range, odd or even pages, all processed loc…

Convert JPG / PNG / WebP images into a PDF online, original size or fit to A4, all proces…