57 tools total
Strip whitespace, compress SQL/CSS/JS — shows compression ratio in real time
Convert between camelCase, snake_case, kebab-case and more; case conversion; symbol replacement
Convert numbers to Chinese words; format amounts in Chinese financial notation
Convert between Simplified and Traditional Chinese, covering 800+ common characters
Line-by-line diff with syntax highlighting, line numbers, and inline character changes
Live regex matching with highlight, multiple flags, and capture group details
Compress JPEG/PNG/WebP locally in your browser with adjustable quality
Convert between JPEG, PNG, WebP and AVIF formats with adjustable output quality
Resize and crop images online — scale by pixels or percentage, lock aspect ratio, crop to 1:1, 16:9 and more
Split photos into 3×3 or other grid layouts for sharing
Add text watermarks with customizable position, color, opacity and rotation
Extract dominant colors from images, output HEX/RGB — essential for designers
AI-powered background removal, outputs transparent PNG, fully local processing
Shorten long URLs instantly, or expand short links back to their original URL
MD5, SHA-1, SHA-256, SHA-384, SHA-512 with optional HMAC mode
Format, minify, escape, unescape, sort keys — with real-time syntax validation
Convert JSON arrays to CSV and back — comma, semicolon or tab delimiter, Excel-compatible download
Encode/decode text, URL-safe mode, convert images to Base64 Data URI
Convert timestamps, compare time zones worldwide, calculate date differences
AES-256-GCM encryption, ROT13/Caesar/Vigenère classic ciphers, URL encode/decode
UUID, Snowflake ID, random strings and password generator with batch support
160+ kaomoji organized by category, click to copy instantly
Auto-detect your IP or look up any IP for country, city, ISP and timezone info
Step-by-step Chinese kinship calculator — figure out how relatives are addressed
Calculate monthly payments, total interest and repayment schedule for mortgages
2024 China income tax calculator with social insurance and special deductions
Real-time converter for length, weight, temperature, area, volume, time and speed
Calculate BMI and estimate body fat percentage from height, weight, age and gender
Visual Spring Boot cron expression builder with presets, DOW/month pickers, and live next-5-trigger preview
Subnet mask calculator, IP format converter (binary/hex/integer), CIDR subnet divider, and IP address list generator
Classic attention training — 3×3 to 6×6 grids, millisecond timer, auto-saves best times
Color-word interference test for inhibitory control and cognitive flexibility
Track position and letter N steps back simultaneously to train working memory
60-second countdown with real-time WPM/CPM/accuracy, supports Chinese and English
Click when the screen turns green — 5 rounds averaged, millisecond precision
Click green circles, hold back on red — 30 stimuli, tracks hit rate and false alarms
Enter wake-up time to get optimal bedtimes based on 90-min sleep cycles, with ratings
Free online SVG optimizer — remove comments, metadata, hidden elements, round numeric precision. Live preview, fully local
Free online image to PDF — merge JPG/PNG/WebP, drag to reorder, A4/Letter page size, fully local
Online color palette generator — complementary, analogous, triadic schemes from any base color. Copy HEX/RGB/HSL or export CSS vars
Real-time character, word, line and paragraph counter with reading time and top-10 word frequency
Remove duplicate lines with case sensitivity, whitespace trimming, empty line removal and sorting options
Generate Lorem Ipsum, Chinese paragraphs, random words, number sequences and custom random strings
Real-time password strength analysis — character composition, GPU crack time estimate and improvement tips. Fully local
Decode and verify JWTs — parse Header/Payload/Signature, verify HS256/384/512 signatures, check expiry
Real-time conversion between HEX, RGB, HSL, HSV and CMYK — color preview, click to copy
Beautify or minify SQL with keyword uppercase and custom indentation. Supports MySQL, PostgreSQL and standard SQL
Complete HTTP 1xx–5xx status code reference with descriptions and use cases. Search by code or keyword
Convert between binary, octal, decimal, hex and any base (2–36). Supports negatives and binary grouping
Real-time conversion between px, rem, em, vw, vh, pt, cm and mm. Customize base font size and viewport
Generate QR codes with custom colors and error correction, or decode QR codes from uploaded images. Fully local
Generate barcodes in Code128, EAN-13, EAN-8, UPC-A, Code39 and ITF-14 formats. Custom colors, download PNG
Enter your birthday to get exact age in years/months/days, total days and weeks lived, and a countdown to your next birthday
Countdown to a target date or custom duration; stopwatch with lap recording — great for study, workouts and meetings
Online random draw — type a list or import Excel/CSV, choose column and start row, draw one or more. History log, fully local
Online Pomodoro timer — 25 min focus, 5 min break, long break every 4 rounds. Customizable durations with audio alert
Real-time currency converter — 160+ currencies, daily updated rates, instant conversion