Online Toolbox · All Categories

Compress JPG / PNG / WebP, custom quality and dimensions

Convert between JPG / PNG / WebP, HEIC to JPG

Crop, rotate and flip images with custom ratios

Change ID photo background (blue/white/red), common sizes

Add text watermarks with custom position, size and opacity

Split an image into a 3×3 grid for social posts

Stitch multiple images vertically or horizontally

Create GIFs from images, adjust frame rate and size

Convert between images and Base64 data URLs

Generate custom QR codes with logo, color and size

Upload an image to decode its QR content

Extract dominant colors and palettes from images

Mosaic or blur sensitive areas in images

Generate favicon.ico from images or text

Convert SVG vector images to PNG, custom dimensions

Frame screenshots in iPhone / Android / tablet / laptop shells

View EXIF metadata of photos (camera, params, GPS)

View image dimensions, resolution, file size, DPI

Convert images to ASCII character art

Adjust brightness / contrast / saturation / hue

Extract all elements from tiled designs, transparent PNG + palette

Vectorize bitmaps: color quantization + contour tracing + smoothing

Auto-trim PNG transparent borders with threshold, margin, batch

Make round or rounded-corner avatars with border, size and background options

Count characters, words and lines, CJK and Latin separately

Deduplicate lines, remove empty lines, trim and sort

Convert case, full/half width, camelCase / snake_case / kebab-case

Convert between simplified and traditional Chinese

Compare two texts line by line

Convert Markdown to HTML with live preview and export

Strip Markdown markers, keep plain text and line breaks

Real-time regex testing with match highlighting

Base64, URL, Unicode, Morse and more codecs

Guess and fix mojibake, auto-detect encoding

Generate random passwords with customizable strength and rules

Generate random Chinese names, English names and usernames

Detect sensitive words in text, custom word list

Convert text to speech, multiple languages and speed

Real-time speech recognition, native browser capability

Flip text upside down, mirror, reverse order

Remove HTML tags and extract plain text

Repeat text N times with separators and line breaks

Convert Chinese text to vertical (right-to-left) layout

WYSIWYG Markdown editor with tables, tasks, syntax highlight

Chinese ↔ Wubi 86 encoding lookup with root and code tables

Sort lines: ascending, descending, shuffle, by length, dedupe and merge

Read plain text in large fonts: adjustable size, line height and background

Count word frequency in text, ranked list with Chinese and English tokenization

Batch extract all URLs from text, dedupe, sort and copy

Encode and decode HTML entities, escape special characters

Convert between CSV / Excel data and Markdown tables

Convert Chinese to pinyin with tones, initials, full mode

Convert text to Mars text and back

Hide secrets in plain text using zero-width characters

Format, minify, validate JSON, convert to Go struct / TS interface

Search JSON by field, value or path with highlights, supports jq expressions

Convert between Unix timestamps and dates, seconds and milliseconds

Generate and parse cron expressions, preview next run time

Generate UUID v4 / v7 / ULID / NanoID

Compute MD5 / SHA1 / SHA256 / SHA512 of text or files

Decode JWT header and payload, view expiry time

Encode and decode URL / URI components

Quick reference of HTTP status codes, meaning and usage

Parse User-Agent strings to identify browser, OS and device

Check your IP, validate IPv4/IPv6 and calculate subnets

Convert Linux file permission numbers and symbols

Format and minify SQL statements, multiple dialects

Convert between YAML, JSON and TOML

Convert curl commands to Python / Go / JS / axios code

Compare two texts side by side, highlight changed lines

Estimate token usage in major LLMs

Generate Lorem Ipsum placeholder text, custom paragraphs

Convert px to rem/em units with custom root font size, batch support

Generate JWT tokens (HS256) with custom header, payload and secret

Convert between JSON and CSV tables

Beautify JavaScript / CSS / HTML code

Convert between binary / octal / decimal / hex

Visual generator for CSS linear / radial gradients

Adjust box-shadow visually and generate CSS

Visually debug Flexbox layout properties

Generate SEO + Open Graph + social media meta tags

Assess password strength with crack-time estimate and tips

Convert between HEX / RGB / HSL with CSS preview

Validate JSON syntax, highlight errors and give fixes

Convert between text and \uXXXX / U+XXXX encodings

Generate Hello World code in 30+ programming languages

Parse URL structure: protocol / host / path / query / anchor

Analyze SQL queries and suggest indexes

Optimal pool size from concurrency and database spec

Paste EXPLAIN output, flag performance issues automatically

Estimate table disk usage from schema and row count

Generate ALTER / CREATE migration scripts

Calculate individual income tax with social insurance

Compare equal-installment and equal-principal payments

Deposit interest and compound interest calculation

Figure out kinship terms — your holiday helper

Days between dates, countdown, business days

Age, Chinese zodiac and constellation from your birthday

BMI calculation and health assessment

Length, weight, area, temperature, base conversion

Common currency exchange rates

Convert numbers to Chinese uppercase (for invoices)

Time zones of major cities and time conversion

Trigonometric, logarithmic and power scientific calculator

Percentage: share, change rate, discount

Validate Chinese ID numbers, parse region and birthdate

25-min focus + 5-min break pomodoro timer

Stopwatch and countdown timer with lap recording

Convert between Arabic and Roman numerals

Split bills: total, tip, discount, rounding rules, per-person share at a glance

Estimate due date from last menstrual period or ovulation day, show current week

Calculate retirement age under China 2025 gradual delay policy

Celsius / Fahrenheit / Kelvin / Rankine conversion

Calculate social insurance contributions by city / base

Any-base conversion: binary / octal / decimal / hex

Bit / Byte / KB / MB / GB / TB / PB storage conversion

Partition capacity calculator, actual usable space

Generate random numbers in a range, no repeats

A customizable wheel to let fate decide

Flip coins and roll dice, multiple sides

Random pick from a name list for lottery / groups

Generate fake names, phones, emails and addresses

Batch generate random colors, copy HEX / RGB / HSL, a palette inspiration source

Random emoji picker, browse by category, one-click copy to any platform

Pick random options with weights and no-repeat mode, stop hesitating

Generate random dates and times within a range with custom formats

Random lottery numbers: Double Color Ball, Super Lotto, 3D, 7-Star

Generate geometric avatars with random colors, seed-based stable output, export PNG

Merge multiple PDFs into one

Split PDF and extract specific pages

Convert each PDF page to PNG / JPG

Combine multiple images into one PDF

Compute MD5 / SHA256 checksums of files

Convert between SRT / ASS / VTT subtitle formats

单文件 PowerPoint 替代：编辑、放映、协作一体，本地优先，打开即用

Parse and view CSV: sort, filter, search, stats, export to TSV / JSON

Teleprompter for voice-over: import SRT / ASS / VTT or plain text, auto-advance line by line

Convert between XML and JSON, preserving attributes and text nodes

Compress PDF files: clean redundant data, re-encode images, before/after comparison

Generate WiFi QR codes, scan to connect without password

Generate vCard contact QR codes, save to contacts directly

Generate QR codes in batch from a text list, package download

Generate brand QR codes with a center logo

Scan QR codes in real time with your camera

Generate calendar event QR codes, add to calendar by scanning

Round-dot and gradient art-style QR codes

Generate SMS QR code, scan to open messaging app with content filled

Generate EAN / UPC / Code128 and more barcodes

macOS terminal scripts: optimization, dev env, quick actions

Windows PowerShell / CMD scripts, copy and run

Docker cheatsheet: containers, images, network, volumes

Git cheatsheet: branch, merge, stash, revert

Linux ops commands: process, disk, memory, network

MySQL / PostgreSQL / Redis / MongoDB cheatsheet

Curl commands: GET / POST / auth / upload / debug

Vim cheatsheet: move, edit, search, replace, windows

kubectl cheatsheet: pods, deployments, services, debugging

Common code snippets: Python / JS / Go utilities

Nginx configs: reverse proxy, load balancing, HTTPS, cache

FFmpeg cheatsheet: convert, cut, audio, subtitle, GIF, filters

SSH cheatsheet: connect, keys, tunnels, file transfer, hardening

npm / pip / brew / apt / cargo commands with mirror sources

PowerShell cheatsheet: files, system, process, network, registry

pnpm cheatsheet: workspaces, store, mirrors, npm comparison

Makefile cheatsheet: rules, variables, functions, auto-variables, templates

Markdown cheatsheet: headings, lists, tables, code, quotes, one-click copy

Work Louder × OpenAI 3D keyboard demo: keys, LED effects and agent animation

xAI grok-build technical whitepaper: architecture, tool calls, sandbox, agent coding

macOS-style calculator: basic / scientific / programmer modes

117 spring-physics UI micro-interactions, live preview, copy CSS / React code

Chinese / English typing speed test with live WPM, accuracy and timing

Pixel art board: grid drawing, palette, eraser, export PNG

Join in Grade 5 English reading: words, sentences and audio textbook

Kids pinyin reading: initials, finals and tones, tap to listen

Mental math practice: addition, subtraction, multiplication and division with timer

Chinese idiom quiz: fill-in-the-blank and meaning challenges, 100+ idioms