Free and practical online tools collection
Favorite tools for quick access
Online JSON formatting, beautifying and minifying tool
Convert text to/from Base64
Generate UUID v4 in batches
Convert between Unix timestamp and datetime
URL encoding and decoding tool
Generate SHA hash values
Real-time regular expression testing
Parse and validate JWT tokens
Format JS/HTML/CSS/JSON code
Generate cron expressions visually
Convert images to and from Base64
Calculate Unix/Linux file permissions
Convert between JSON and CSV formats
Convert between YAML and JSON formats
Complete HTTP status code reference
View your browser and device information
Format and beautify SQL queries
File extension and MIME type reference
Convert between binary, octal, decimal and hexadecimal
Generate URL-friendly slug strings
Generate HTML meta, Open Graph and Twitter Card tags online
Escape HTML, URL, JSON strings
Convert DOCX, PDF, HTML, TXT, CSV to Markdown format
Encode or decode HTML entities like < and &
Pretty-print or minify XML locally in your browser
Convert cURL commands into fetch or axios snippets
Compute network, mask and usable host range from CIDR
Convert between RGB/HEX/HSL colors
Count characters, words, lines, etc.
Generate random passwords
Generate QR codes for text or links
Compare differences between two texts
Convert between PNG/JPG/WebP formats
Compress images online
Edit Markdown with live preview
Convert text between different cases
Generate placeholder text for design
Quickly copy emoji symbols
Generate CSS gradient backgrounds
Generate harmonious color schemes
Remove duplicate lines from text
Sort lines of text
Reverse text order
Batch find and replace text
Convert text to ASCII art
AI-powered essay scoring for Shanghai college entrance exam, with detailed analysis and suggestions
Merge or split PDF files online. No upload needed, processed locally for privacy
Resize and crop images online with custom dimensions and aspect ratio
AI-powered background removal. Create transparent PNG images instantly
Convert video clips to animated GIFs with custom size, FPS and speed
Free online PowerPoint translation tool powered by AI. Translate PPT slides while preserving layout, fonts, and formatting. Supports Chinese-Japanese, Chinese-English, and Japanese-English translation. Tables, charts, and grouped elements all supported.
Add utm_source, medium and campaign params to tracking URLs
Create wa.me click-to-chat links with optional prefilled text
Visually tune box-shadow and copy ready-to-use CSS
Convert JPG, PNG and WebP images to PDF online — free, private, processed locally
Export every PDF page as PNG or JPG images, with ZIP download
Read text aloud online with selectable voices, speed and pitch
Draw your electronic signature online: smooth pressure-sensitive strokes, transparent/white PNG export at 1x-3x
Rotate, delete and export PDF pages online — per-page 90° rotation, batch removal, fully local in your browser
Add text watermarks online: font size, opacity, rotation, 9-position grid or tiled — processed locally on Canvas
Crop images online with free/1:1/4:3/16:9 ratios, draggable selection with rule-of-thirds guides, fully local
Generate a scan-to-join WiFi QR code from SSID and password — guests connect without typing a thing
Turn text into a shareable image: multi-line typography with font, size, line-height and palette control, HD PNG export
Free online resume builder: modular experience/projects/skills, live preview, export to print-ready A4 HTML/PDF
A meme-style MBTI parody! 30 absurd questions to discover your quirky personality type
Convert numbers to Chinese RMB format
Convert length/weight/temperature units
Test network download/upload speed
View time across timezones and convert between them
Online tarot card reading for guidance
Check today's horoscope for your zodiac sign
Find your IP address and location info
AI astrologer interprets star codes and explores destiny
Calculate Body Mass Index
Calculate mortgage payments and interest
Set countdown for important moments
Generate random numbers, flip coins, roll dice
Calculate exact age from birthday
Calculate days between two dates
Various percentage calculations
Calculate discounted prices quickly
Validate International Bank Account Numbers
Chat with a cute AI girl, share your mood and stories
Split the bill with tip — get total and per-person amounts instantly
Estimate future value with principal, rate, and recurring contributions
Classic 25/5 focus timer to pace deep work and breaks
Calculate your BMR and daily calorie needs, with targets for weight loss or muscle gain
Random picker wheel for giveaways, name draws and quick decisions
Test your typing speed and accuracy online — 30, 60 or 120 seconds
Classic 2048 with 3/4/5 board sizes, 3 undos per game, keyboard and touch swipe
Classic Snake with googly eyes, 3 board sizes × 3 speeds, wrap-through-walls mode and timed golden bonus fruit
Battle City remake: 12 classic stage layouts, 4 enemy types, 6 power-ups, water/grass/ice terrain — defend the eagle!
Classic Minesweeper: beginner, intermediate and expert 30×16×99, safe first click, double-click chording, question marks
Play Gomoku against the AI on a 15×15 board — undo supported, first to five in a row wins
Classic Tower of Hanoi puzzle with 3-8 discs — animated moves, undo/redo, hints and a one-click optimal solution demo
Classic brick-breaker arcade game — move the paddle, bounce the ball, clear endless levels
Classic card-matching memory game with 4×4 and 6×6 boards — clear it in the fewest moves
Play Tic-Tac-Toe against the AI — normal and unbeatable hard mode
Free online whack-a-mole — no download. Easy/Normal/Hard, golden & swift moles, avoid bombs, combo multipliers
Classic falling-block stack & clear — rotate, line up, score big
Classic link-clear — connect matching tiles with at most two turns
Lite airplane shooter — strafe, auto-fire, dodge and blast enemies
Slide the tray to catch falling coins — miss a gold coin and lose a life
Classic 15-puzzle — slide tiles to restore order 1–15
Classic Reversi / Othello vs AI — flank, flip, and dominate the board
Classic Simon-style color memory — watch the sequence, then tap it back
Tap to soar through pipe gaps — classic glide-and-dodge fun
Three-lane dodge runner — swerve past obstacles and go the distance
Flood-fill from the top-left — unify the board before you run out of moves
Guideline SRS rotation + wall kicks, Hold, 5-piece preview, and Marathon / 40-line Sprint / Ultra modes
Classic Sudoku with unique-solution puzzles, notes and smart hints
The warehouse-keeper classic — push every crate onto a goal spot
Classic FreeCell solitaire: flying-card animation, double-tap home, unlimited undo and safe auto-play
Swap adjacent gems to line up triples and chain cascades
Aim, bounce and pop color clusters — cut floaters loose for big bonuses
Freshly generated mazes — race from the entrance to the green exit
The classic 1A2B deduction game — crack the hidden 4-digit code
Combine four cards with + − × ÷ to make exactly 24
Two nearly identical pictures — find every difference by eye
Classic Lights Out puzzle: tapping a light flips its cross-shaped neighborhood, turn all lights off to win across 3 board sizes
Click when the red turns green: 5-round reaction time test with average score and personal best, touch & spacebar ready
Color sequence memory challenge: watch the path light up and replay it, up to 12 steps on 3×3, race your fastest clear
Classic Hangman word game: animal/fruit/country word banks with multilingual hints, 6 wrong guesses allowed, keyboard & on-screen keys
The classic Chinese tangram: fit all seven pieces back into the square silhouette with rotation, flipping and grid snapping
A JezzBall-style arcade: slide to seal walls around bouncing balls, fill 75% to clear, higher levels add faster balls
Free online rhythm tiles — tap black tiles in the hit zone; miss or wrong lane ends the run
Free online stack game — drop moving slabs at the perfect moment and build higher
Timed online balloon pop — tap rising balloons, gold is triple, avoid bomb balloons
Tap numbers 1…N in order as fast as you can — train focus and reaction
Timed aim trainer — tap flashing targets, gold scores more, avoid red decoys