Free Online Tools — No Sign-Up, No Install
59 browser-based tools for calculating, converting, editing images, generating CSS and running events. Everything runs locally in your browser — your files and numbers never leave your device.
Showing all 59 tools
Utility Tools 44
Calculators, image editors, CSS generators and everyday converters. View category archive
BMR & TDEE Calculator
Calculate your Basal Metabolic Rate (BMR) from gender, age, height, and weight, then see your Total Daily Energy…
Unit Converter
Unit converter for length, weight, area, volume, and temperature
Color Palette Generator
Pick one base color to generate a 5-color palette using color theory (complementary, analogous, triadic, and more)…
CSS Loading Animation Generator
Create ring, dots, bars, pulse and other classic CSS loading spinners visually
Button CSS Generator
Create flat, gradient, 3D, outline, neon, and floating button CSS visually with sliders
Glassmorphism CSS Generator
Create frosted-glass glassmorphism CSS visually with sliders
Lottery Win Probability Calculator
Calculate the probability of winning within a set number of draws when tickets are drawn without replacement
pt / mm / inch Converter
Convert between pt, mm, and inch instantly for print and design work, plus px conversion at 72 / 96 / 300 DPI. Shows…
Color Contrast Checker
Instantly calculate the contrast ratio between background and text colors and check it against the WCAG (AA/AAA)…
Web Color Chart & Picker
Color chart with 216 swatches. Click any color to copy its HEX, RGB, HSL, or CMYK code
QR Code Generator
Create QR codes for URLs, text, WiFi, email, and phone numbers, with custom colors, a logo, and a caption
QR Code Reader
Scan with your webcam or read from an image file to instantly decode URLs, email addresses, phone numbers, and text
Compound Interest Calculator
Compound interest calculator that works in four directions — future value, time to goal, required return, and monthly contribution
CSS Dot Pattern Generator
Build dot and polka-dot backgrounds with live preview and presets, tune size, gap, offset, opacity, and softness…
CSS Stripe Generator
Build striped backgrounds with live preview and presets, fine-tune color, width, opacity, and angle, then copy the…
CSS Gradient Generator
Build linear and radial gradients with live preview and presets, copy the CSS code, or download the result as a PNG image
Code Preview & Exporter
Tool to preview HTML, CSS, and JavaScript live, open the result in a new tab, and download it as a single combined HTML file
CSS Shadow Generator
Visually build box-shadow, text-shadow, and drop-shadow with sliders and presets, preview in real time, and copy the code instantly
Image / Banner Size Checker
Tool to preview how an image or banner looks at any size, check object-fit (cover/contain/fill/none), and download…
Image Transparency Tool
Tool to adjust an image's opacity and download it as a transparent PNG. Runs entirely in your browser, no upload to any server
Image Crop Tool
Browser-based tool to crop images to any aspect ratio (1:1, 16:9, etc.) or custom pixel dimensions — no upload required
Simplify Ratio
Ratio calculator that simplifies two or more numbers into the lowest whole-number ratio
Image Annotation Tool
Tool to draw arrows, lines, circles, rectangles, freehand lines, and text on images
Profit Margin Calculator
Web tool to calculate profit margin, selling price, or cost from any two known values
Resolution / Image Size / Print Size Calculator
Three-in-one calculator for DPI, image pixel size, and print size in mm
Ratio Split Calculator
Tool that splits a total value according to specified ratios
Image Joiner
Browser-based tool to merge multiple images vertically, horizontally, or in a grid layout, then save as PNG, JPEG, or WebP
Permutation and Combination Generator
Generate and list every combination (nCr) or permutation (nPr) from your own items
All Combination Pattern Generator
Enter several attributes and their options to list every possible pattern (Cartesian product / all combinations)
Split Bill Calculator
Web tool for splitting bills easily among any number of people
Fraction Calculator
Web tool for adding, subtracting, multiplying, and dividing fractions
Fraction Simplifier
Web tool for simplifying fractions to their lowest terms
Image Watermark Batch Tool
Tool to batch apply watermarks — copyright text or logo images — to multiple photos at once
Image Resolution [DPI] Calculator
Web tool to calculate the print resolution (DPI) of an image based on its intended print dimensions
Password Generator
Secure, browser-based password generator with customizable length, character types, and real-time entropy display
Image Background Tool
Add a solid color, gradient, or another image as the background of a transparent PNG, directly in your browser
Image Compressor & Resizer
Browser-based tool to resize and compress images. Supports JPEG, PNG, and WebP output
Prime Factorization Calculator
Online tool that instantly breaks down any integer (2 or above) into its prime factors
Discount Rate Calculator
Calculate discounted prices, discount rates, and original prices
BMI Calculator
BMI calculator that supports both metric (cm/kg) and imperial (ft/lbs) units
Probability Calculator
Probability calculator for draws and trials. Calculate win/miss probability for at least once, consecutive wins, or…
Ratio Calculator
Web tool for calculating 2-term and multi-term ratios, proportions, paper sizes, and the golden ratio
Percentage Calculator
Web tool to calculate percentages, base values, and percent change
Expected Value Calculator
Calculate expected value from probability (%), frequency, or fractions
Event Tools 15
Randomisers and party tools for events, classrooms and team games. View category archive
Sound Effect Maker & Web Synthesizer
Sound effect maker and synthesizer. Start from presets (coin, jump, laser, explosion and more) or design your own…
Web Audio Sampler
Browser soundboard that plays sound effects and BGM instantly
Tournament Bracket Maker
Type participant names to auto-build a knockout chart, pick winners with a click, add a 3rd place match, switch…
Web Slot Machine
Customizable web-based slot machine with switchable 3-reel and 5-reel modes
Web Garapon
Garapon-style lottery tool for events and giveaways
Web Scratch Lottery
Scratch lottery tool for events and giveaways. Set item names and quantities, then scratch cards to reveal results…
Simple Scoreboard
Digital scoreboard — no app install required, runs right in your browser
Team Divider & Leader Picker
Browser-based tool to randomly split members into teams and pick leaders, with drag-and-drop member swapping and CSV export
Web Lottery Tool
Lottery tool that runs in your browser — no sign-up required
Bingo Card Generator
Web-based bingo card generator that creates 5×5 bingo cards (numbers 1–75)
Bingo Roulette
Bingo machine that randomly draws numbers from 1–75. No app install needed — runs in your browser on smartphones and PCs
Web Roulette
Customizable web roulette tool. Set items and probabilities freely, then spin to get a random result
Web Lottery Draw Tool
Web-based lottery tool. Enter items line by line, set draw mode and duration, then draw results with animation and sound effects
Web Dice Roller
Roll 1–100 dice at once (d2–d20, plus d30/d50/d100) with custom face combinations
Coin Toss Tool
Toss 1–500 coins at once with a customizable Heads probability
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About These Tools
- Do I need an account?
- No. Every tool on this page works without signing up, logging in or installing anything.
- Are my images and data uploaded to a server?
- No. The image and file tools process everything locally in your browser using JavaScript, so nothing is sent anywhere.
- Can I use these tools on a phone?
- Yes. Every tool is responsive and works on phones and tablets, though the image editors are easier to use on a larger screen.
- Are they free to use commercially?
- Yes. The output of these tools — generated CSS, edited images, calculation results — is yours to use, including for commercial work.