🧰 Online Tools

All tools run entirely in your browser — nothing is uploaded.

Encoding & Conversion

Format, minify and validate JSON

Base64 Encoder / Decoder

Encode / decode Base64, UTF-8 safe

URL Encoder / Decoder

Encode / decode URL components

HTML Escape / Unescape

Convert text and HTML entities

Unicode Converter

Text and \u escape sequences

Text and hexadecimal (UTF-8)

Number Base Converter

Binary, octal, decimal, hex, base 2-36

Break a URL into parts and query params

Decode JWT header and payload locally

Convert between JSON and YAML

Convert between JSON and CSV

CSV/TSV to HTML and Markdown table

Format or minify XML

Convert between JSON and XML

Format or minify SQL

Format or minify CSS

JS Minify / Beautify

Minify or beautify JavaScript

Format or minify HTML

Simplified/Traditional Chinese

Convert Simplified and Traditional

Chinese to Pinyin

Convert Chinese to Pinyin

Text and Morse code translator

Binary Converter

Text and binary (UTF-8)

Arabic and Roman numeral converter

Number to Words

Convert numbers to English words

Validate and format YAML

Convert TOML to JSON

JS Escape / Unescape

JavaScript escape encoding

Text and UTF-8 bytes

Encode email to hide from bots

JSON to Postman

JSON and Postman params

UBB / HTML Converter

BBCode and HTML conversion

SQL IN Generator

Build SQL IN clause from a list

curl → fetch / axios / Python / PHP / Java / Go

Convert SQL INSERT to JSON

JSON to Code

JSON to TypeScript

Generate TypeScript interfaces

Generate Java entity classes

Generate C# classes

Generate Go structs

Generate Python dataclasses

Generate Kotlin data classes

Generate Swift Codable structs

Generate Rust structs

Generate PHP classes or arrays

Generate Dart classes

JSON to Objective-C

Generate Objective-C classes

Generate C++ structs

Generate Scala case classes

JSON to Protobuf

Generate proto3 messages

JSON to JSON Schema

Generate JSON Schema draft-07

Generate CREATE TABLE statement

Text Tools

Characters, words, CJK, lines, paragraphs

Test regular expressions with live matches

UPPER, lower, camelCase, snake_case

Dedupe, sort, trim and number lines

Compare two texts line by line

Markdown Preview

Live Markdown to HTML preview

Find and Replace

Find and replace with regex support

Lorem Ipsum Generator

Generate placeholder text

Dedupe and Count

Remove duplicates, count frequency

Full/Half Width

Convert full-width and half-width

Make URL-friendly slugs

Reverse characters, lines or words

Randomly shuffle lines or words

Remove Empty Lines

Strip blank lines and line breaks

Add Line Numbers

Number lines or add prefix/suffix

Text Interval Generator

Insert a separator between characters

Line Length Filter

Keep or delete lines by length

Odd / Even Line Filter

Keep odd, even or swap lines

Text to HTML Paragraphs

Wrap text in escaped <p> tags

Batch URL Generator

Build URL lists from a template

ID Card Validator

Validate Chinese ID and extract info

HTML to Markdown

Convert HTML to Markdown

Table Generator

Generate HTML and Markdown tables

Render text as an image

Big ASCII banner text

Sum, average, min, max of numbers

Auto Format Text

Tidy and reflow text

Crypto & Security

Hash Calculator

MD5, SHA-1, SHA-256, SHA-512

Password Generator

Strong random passwords, generated locally

Generate UUID v4 in bulk

AES Encrypt / Decrypt

AES-256-GCM in your browser

RSA Key & Encrypt

Generate RSA keys, encrypt/decrypt

Base32 Encode / Decode

RFC 4648 Base32

CRC32 of text or files

Gzip Compress / Decompress

Gzip in your browser

Punycode Converter

IDN Punycode encode/decode

Date & Time

Unix Timestamp Converter

Timestamp and date, live epoch clock

Explain cron expressions and next runs

Date Difference

Days between two dates

Date Add / Subtract

Add or subtract from a date

Exact age and next birthday

Live times and timezone converter

Countdown Timer

Count down to a target date

Stopwatch with lap times

Focus and break timer

ISO week and day of year

Gregorian to Chinese lunar date

Chinese solar term dates

Find your zodiac animal

Find your star sign

Angle between clock hands

Batch Timestamp Converter

Convert many timestamps at once

Crontab Generator

Build cron expressions visually

Image & Color

Color Converter

HEX / RGB / HSL with live preview

Image to Base64

Convert images to Data URLs locally

Chinese Traditional Colors

Traditional Chinese color palette

Color Format Converter

RGB/HEX/CMYK/HSV/HSL

Blend two colors, get mid tones

Web Safe Colors

216 web-safe color palette

Inverse and complementary color

Image Compressor

Compress JPG/PNG/WebP locally

Resize images by pixels or percent

Image Converter

PNG / JPEG / WebP conversion

Crop images in your browser

Favicon Generator

Generate favicon in all sizes

Image Watermark

Add text watermark to images

Rotate / Flip Image

Rotate and flip images

Nine Grid Cutter

Cut image into 3×3 grid

Placeholder Image

Generate placeholder images

Grayscale, sepia, invert and more

Web Dev

CSS Gradient Generator

Visual CSS gradient generator

Visual box-shadow generator

CSS Unit Converter

px, rem, em, pt conversion

Cubic Bezier Editor

cubic-bezier easing editor

JavaScript Key Codes

Show key codes for any key

Flexbox Generator

Visual CSS flexbox playground

Subnet Calculator

IPv4 CIDR subnet calculator

User-Agent Parser

Parse browser, OS and engine

Compare semantic versions

JSON Path Query

Query JSON by path

IPv4 and integer conversion

Test Data Generator

Generate fake test data

Barcode Generator

Code 128 barcode generator

QR Code Decoder

Decode QR code from image

Native to ASCII

native2ascii for properties

Meta Tag Generator

SEO meta and Open Graph tags

robots.txt Generator

Generate robots.txt

MAC Address Generator

Generate random MAC addresses

QR Code Generator

Generate QR codes from text

Generate mock JSON data

JSON to Query String

JSON and URL query conversion

Parse and format cookies

Lat/Long Converter

Decimal and DMS coordinates

CSS Border Radius

Visual border-radius generator

CSS Text Shadow

Visual text-shadow generator

CSS keyframes animation generator

Glassmorphism CSS

Frosted glass effect generator

Screen pixel density calculator

Test XPath against XML/HTML

Web Font Tester

Preview web fonts

Calculators

RMB Amount in Words

Chinese uppercase amount converter

Length, weight, temperature, storage

Length Converter

km, m, cm, mile, foot, inch

Weight Converter

ton, kg, g, lb, oz, jin

Temperature Converter

Celsius, Fahrenheit, Kelvin

km², hectare, mu, acre, sqft

Data Storage Converter

KB/MB/GB and KiB/MiB/GiB

Body mass index and healthy range

Loan Calculator

Mortgage payments, two methods

Random Number Generator

Crypto-grade random integers

Percentage Calculator

Percentage of, change, ratio

China Income Tax

China personal income tax estimate

Scientific Calculator

Full scientific calculator

Tip, total and split per person

Discount Calculator

Sale price and savings

Aspect Ratio Calculator

Ratio and resize dimensions

Weighted grade point average

Compound Interest

Compound interest calculator

Deposit Interest

Bank deposit interest calculator

BMR / Calorie Calculator

Basal metabolic rate and TDEE

Due Date Calculator

Pregnancy due date and weeks

Fuel Cost Calculator

Fuel consumption and cost

USD Amount in Words

Number to US dollars in words

EUR Amount in Words

Number to euros in words

GBP Amount in Words

Number to pounds in words

Download Time Calculator

Bandwidth and download time

Random & Fun

Roll dice of any sides

Flip a coin, track heads/tails

Pick randomly from a list

Random Number Combos

Generate lottery-style numbers

Random Name Generator

Generate random names

Reference

HTTP Status Codes

Searchable HTTP status code list

File extension to MIME type

HTML entity reference table

Full ASCII character table

Chmod Calculator

rwx and octal permission calculator

Special Symbols

Copy special characters and symbols

Well-known port number reference

Git command cheat sheet

Linux command cheat sheet

Searchable emoji reference

Operator Precedence

Operator precedence table

HTTP header field reference

Editor Shortcuts

VS Code and DevTools shortcuts

File signature reference

Package manager mirror sources

EASCII 128-255 table

Search Engine Spiders

Crawler UA and IP reference

Public DNS Servers

Public DNS server list

Frontend CDN Libraries

Common CDN library URLs

Network & App

Your IP address and browser info

QR Code and File Transfer

QR codes, file sharing and P2P transfer

HTTP Request Builder

Build a request → curl / fetch / PHP / Java / Go

Address Generator

US Address Generator

Realistic random US addresses

HK Address Generator

Realistic random Hong Kong addresses

UK Address Generator

Realistic random UK addresses

Canada Address Generator

Realistic random Canadian addresses

Australia Address Generator

Realistic random Australian addresses

Singapore Address Generator

Realistic random Singapore addresses

New Zealand Address Generator

Realistic random NZ addresses

Malaysia Address Generator

Realistic random Malaysian addresses

Germany Address Generator

Realistic random German addresses

France Address Generator

Realistic random French addresses

Italy Address Generator

Realistic random Italian addresses

Spain Address Generator

Realistic random Spanish addresses

Netherlands Address Generator

Realistic random Dutch addresses

Taiwan Address Generator

Realistic random Taiwan addresses

Japan Address Generator

Realistic random Japanese addresses

China Address Generator

Realistic random China addresses