Free Online Tools
All tools run locally in your browser. Your data is never uploaded to any server: fast, private and free.
Calculator
Percentage Calculator
Find percentages, ratios and percent change instantly.
Use nowAge Calculator
Calculate exact age in years, months and days from a birth date.
Use nowDate Difference Calculator
Count days, weeks and working days between two dates.
Use nowTip Calculator
Calculate tip, total and amount per person for any bill.
Use nowLoan Calculator
Estimate monthly payments, total interest and payoff plans.
Use nowScientific Calculator
Online scientific calculator with trig, logs, roots and powers.
Use nowCompound Interest Calculator
Project investment growth with contributions and compounding.
Use nowIncome Tax Calculator
Estimate China individual income tax and after-tax pay from monthly or annual income, with deductions and two annual bonus methods compared side by side.
Use nowDeveloper
JSON Formatter
Format, minify and validate JSON with syntax highlighting.
Use nowBase64 Encode/Decode
Encode and decode Base64 for text and files.
Use nowTimestamp Converter
Convert between Unix timestamp and date-time, seconds/ms.
Use nowRegex Tester
Test regular expressions with live highlighting and groups.
Use nowDiff Checker
Compare two texts line by line with colored differences.
Use nowMarkdown Editor
Write Markdown with live preview and HTML export.
Use nowCSV to JSON Converter
Convert between CSV and JSON both ways with headers.
Use nowHTML Entity Converter
Encode and decode HTML entities including < & etc.
Use nowText Encryptor
Encrypt and decrypt text locally with AES-GCM.
Use nowHash Generator
Compute MD5, SHA-1, SHA-256 hashes of text or files.
Use nowURL Encoder & Decoder
Encode and decode URLs or URI components online.
Use nowJWT Decoder
Decode JWT tokens to inspect header, payload and expiry.
Use nowXML Formatter
Format, minify and validate XML with clear error messages.
Use nowURL Slug Generator
Turn any title into a clean, SEO-friendly URL slug.
Use nowNumber Base Converter
Enter an integer in any base from 2 to 36 to see binary, octal, decimal, hex and base-36 results. Big integers stay exact through BigInt, and every row copies in one click.
Use nowCron Expression Generator
Edit cron expressions field by field across minute, hour, day, month and weekday. See plain-English and Chinese descriptions, the next five run times, and live range validation, all in your browser.
Use nowMeta Tag Generator
Fill in the title, description and page URL to build meta snippets live, with a Google search preview.
Use nowSubnet Calculator
Enter an IPv4 address with a prefix or a subnet mask to get network address, broadcast, usable host range and a binary view.
Use nowTOTP Generator
Paste a Base32 secret or an otpauth URI and get live one-time codes. Choose SHA-1, SHA-256 or SHA-512, 6 or 8 digits, and a 30 or 60 second period. Everything runs locally.
Use nowYAML JSON Converter
Convert YAML to JSON and back online, with three directions, indent options and key sorting. Syntax errors report the exact line and column, all locally.
Use nowChmod Calculator
Toggle permission checkboxes and get octal, symbolic and a ready chmod command
Use nowSQL Formatter
Pretty print SQL with a hand built tokenizer, clause breaks and safe comments
Use nowImage
Image Compressor
Compress JPG, PNG and WebP images locally in your browser.
Use nowImage Converter
Convert images between PNG, JPG, WebP, BMP and ICO.
Use nowImage Cropper
Crop images online with free or preset aspect ratios.
Use nowImage Resizer
Resize images by pixels or percentage, keep aspect ratio.
Use nowImage to Base64
Convert images to Base64 / Data URI for HTML and CSS.
Use nowImage Watermark
Add a custom text watermark to images online.
Use nowFavicon Generator
Create multi-size website icons from one image.
Use nowImage Rotate & Flip
Rotate by 90° steps or any angle, flip horizontally or vertically.
Use nowCompress Image to Target Size
Compress JPG, PNG and WebP images down to a target KB size. The tool resizes to your max edge first, then binary-searches the best JPEG quality, all locally in your browser.
Use nowID Photo Maker
Crop and align your picture to standard ID sizes, switch between white, blue and red backgrounds, then export a print-ready JPG or PNG, all locally.
Use nowDocument
PDF Merge
Merge multiple PDF files online. Everything runs locally.
Use nowPDF Split
Extract pages from a PDF by page range into a new file.
Use nowImages to PDF
Combine multiple images into a single PDF file.
Use nowAdd Page Numbers to PDF
Add page numbers to any PDF with custom position, format, start number and margin. Everything runs locally in your browser.
Use nowPDF to Image
Render every PDF page to PNG or JPG, pick a page range and output scale, then save each page, parsed locally in your browser.
Use nowPDF Organize
Reorder, rotate, delete or extract PDF pages in your browser. Edit page by page, then download a fresh PDF.
Use nowPDF Watermark
Add text watermarks in your browser: tiled or centered, with size, color, opacity, rotation and page ranges. The result downloads automatically.
Use nowText
Word Counter
Count words, characters and lines of any text in real time.
Use nowText Case Converter
Convert text to upper, lower, title, camelCase and more.
Use nowLorem Ipsum Generator
Generate placeholder text by paragraphs, sentences or words.
Use nowKeyword Density Checker
Analyze keyword frequency and density in your content.
Use nowText to Speech
Read any text aloud with adjustable voice, rate and pitch.
Use nowDuplicate Line Remover
Remove duplicate lines from text with smart options.
Use nowChinese Converter
Convert between Simplified and Traditional Chinese locally in your browser: 2,443 high-frequency character pairs plus 177 Taiwan phrase entries. Punctuation, digits, English and line breaks stay as they are.
Use nowNumber to Chinese Words
Convert numbers to formal Chinese uppercase words for RMB amounts and parse the words back to digits. Yuan, jiao, fen, the zheng suffix and zero folding all follow cheque writing rules.
Use nowTyping Speed Test
Timed typing in English and Chinese with live speed, accuracy and personal best
Use nowGenerator
QR Code Generator
Create QR codes from text or URLs and download as PNG.
Use nowPassword Generator
Generate strong random passwords with custom options.
Use nowRandom Number Generator
Generate random integers or decimals in any range.
Use nowUUID Generator
Generate UUID v4 / GUIDs in bulk with options.
Use nowDice Roller
Roll D4-D100 dice online with totals and history.
Use nowBarcode Generator
Generate EAN-13, EAN-8, UPC-A, Code 39 and Code 128 barcodes with automatic check digits and PNG download, all processed locally in your browser.
Use nowRandom Group Generator
Paste a name list, split it into random groups, or draw one person at random.
Use nowWheel Spinner
Spin a wheel online with your own options and weights, smooth easing, an instant result copy and a short history.
Use nowQR Code Scanner
Scan QR codes with your camera or decode an image file to reveal URLs, Wi-Fi settings, contact cards and plain text. Everything is processed locally in your browser and never uploaded.
Use nowEmoji Picker
Browse over a thousand common emoji by category, search in English and Chinese, click to copy, with recent picks remembered, all offline.
Use nowDesign
Color Picker
Pick colors and convert HEX, RGB and HSL instantly.
Use nowColor Palette Generator
Generate harmonious color palettes from one base color.
Use nowCSS Gradient Generator
Visually build linear and radial gradients, copy the CSS.
Use nowColor Contrast Checker
Check text contrast against WCAG AA and AAA levels.
Use nowColor Converter
Convert HEX, RGB, HSL, HSV, CMYK and OKLCH in real time, with alpha kept intact.
Use nowBorder Radius Generator
Round corners with per corner sliders, blob mode and copyable CSS
Use nowBox Shadow Generator
Tune a two layer box shadow with a live preview and copyable CSS
Use nowGlassmorphism Generator
Tune blur, saturation and gradients to build frosted glass cards
Use nowConverter
Timer
Countdown Timer
Precise online countdown timer with end alert.
Use nowPomodoro Timer
Classic 25/5 focus timer with automatic work-break cycles.
Use nowStopwatch
Online stopwatch with millisecond precision and lap times.
Use nowLunar Calendar Converter
Convert Gregorian dates to the Chinese lunar calendar and back, with zodiac animals, heavenly stems and leap months, from 1900 to 2100, fully offline.
Use nowHealth
BMI Calculator
Calculate your Body Mass Index with category reference.
Use nowCalorie Calculator
Calculate BMR, TDEE and daily macro targets.
Use nowBody Fat Calculator
Estimate body fat with the US Navy method or the BMI formula, plus category, fat mass and lean mass
Use nowDue Date Calculator
Estimate your due date, gestational age and trimester dates from your last period
Use nowOvulation Calculator
Predict ovulation day, the fertile window and your next period from your cycle
Use nowDaily Water Intake Calculator
Estimate daily water needs from weight, exercise, pregnancy and climate
Use nowWeb
Camera & Mic Test
Test your webcam and microphone right in the browser.
Use nowMy Browser Info
Inspect your browser, screen and system details.
Use nowKeyboard Tester
Press any key to light up its keycap, test multi-key rollover and track per-key counts. The panel shows event.key, code, keyCode and modifier combos.
Use nowGames
2048
Slide and merge matching tiles to reach 2048.
Use nowSnake
The classic snake game — eat, grow, do not crash.
Use nowTetris
Stack, rotate and clear lines in the classic block game.
Use nowMinesweeper
Clear the board without detonating a mine.
Use nowSudoku
Play Sudoku with notes, hints and difficulty levels.
Use nowMemory Match
Flip cards and match every pair in as few moves as possible.
Use nowBreakout
Bounce the ball and smash every brick.
Use nowWord Guess
Guess the five-letter word in six tries.
Use nowSolitaire
The classic Klondike — build the four suits from Ace to King.
Use nowBlackjack
Beat the dealer by getting closer to 21 without going bust.
Use nowPyramid
Clear the pyramid by pairing cards that add up to 13.
Use nowDino Run
The Chrome offline dino — jump the cacti and keep running.
Use nowFlappy Bird
Tap to flap through the pipes and beat your best.
Use nowBubble Shooter
Aim, shoot and pop clusters of three or more bubbles.
Use nowTile Connect
Match identical tiles with a path of two turns or fewer.
Use nowBlock Blast
Fit blocks on the 8x8 grid and clear full rows and columns.
Use nowGomoku
Play Gomoku against the computer — five in a row wins.
Use nowConnect Four
Drop discs on a 7×6 board and line up four to win.
Use now24 Game
Make 24 from four numbers. Every puzzle is solvable and judged with exact fractions.
Use nowSliding Puzzle
Slide the shuffled tiles back into order on three board sizes.
Use nowTic Tac Toe
Play Tic Tac Toe against the computer on a 3×3 board.
Use nowWord Search
Find every hidden word in the letter grid, in any of eight directions.
Use nowCheckers
Jump, capture and crown kings on an 8×8 board.
Use nowChinese Chess
Play Xiangqi on a 9×10 board with full rules and three AI levels.
Use nowPicture Puzzle
Swap pieces by dragging to rebuild a photo or a generated pattern.
Use nowMahjong Solitaire
Pair free tiles and peel the classic 144 tile turtle board.
Use nowReversi
Flip your opponent's discs on an 8×8 board, with three AI levels, undo and move hints.
Use nowSpider Solitaire
Build same-suit runs in ten columns and clear eight full suits to win.
Use nowTower of Hanoi
Move the whole stack to another peg, bigger disks never on smaller ones, with 3 to 8 disks, an optimal move benchmark and an auto solver.
Use nowLights Out
Tap a light to flip it together with its neighbors and turn the whole board off, and every board is guaranteed solvable.
Use nowPeg Solitaire
Jump pegs over neighbors on the classic 33-hole board, finish with as few as possible
Use nowSokoban
Classic crate-pushing puzzle with 12 levels, undo and step-by-step replay
Use nowSpace Invaders
Classic arcade shooter, blast the alien fleet as it speeds up wave by wave
Use nowWhack-a-Mole
Moles pop out of a nine-hole grid and vanish fast, chain hits for combos, and race your best score in a 30 second rush.
Use nowNonogram
Deduce which cells to fill from row and column number clues, reveal the hidden picture, and watch line clues light up as you go.
Use nowReaction Test
Tap the instant the panel turns green to measure millisecond reactions, or chase random targets for 30 seconds to train your aim.
Use nowGuides & Tutorials
The Complete Guide to Working with PDFs Online
How to merge, split and convert images to PDF online — steps, common issues, and why local processing protects your files.
Read guideImage Formats Explained: JPG vs PNG vs WebP
Lossy vs lossless, quality sweet spots, transparency, and a decision table for picking the right image format.
Read guideWeb Color & Contrast: WCAG Primer
How contrast ratios work, what AA/AAA require, common failing color pairs, and a step-by-step checking workflow.
Read guideQR Codes: Uses, Tips & How to Create
How QR codes work, sizing rules, error-correction levels, print tips, and static vs dynamic codes.
Read guidePassword Security 101: Strong Passwords
What makes a password strong, how entropy works, management strategies, hashing basics, and common mistakes.
Read guideDeveloper’s Handbook: URL Encoding, Base64 & JWT
Percent-encoding rules, how Base64 works, JWT structure and claims, plus debugging tips for all three.
Read guideWhy Choose Lite Tools
Lite Tools is a free, browser-based toolbox with 90 utilities covering PDF, images, developer helpers, text processing and everyday calculators, plus 37 casual games including 2048, Snake, Dino Run, Bubble Shooter, Tile Connect and Gomoku. Every calculation and file operation happens directly in your browser: your files are never uploaded to any server, and tools keep working offline once loaded.
No account required, no usage limits: open a page and start working. The layout adapts to phones, tablets and desktops, games support both keyboard and touch controls, and every page ships with a step-by-step guide and FAQs so you can get productive on the first visit.
Local processing: data stays in your browser
Files and text are processed on your device, never passing through a server.
Completely free, no signup
Every tool is free to use with no limits on frequency, duration or features.
Works on every device
Smooth on phone, tablet and desktop browsers: open and go.