Select Tool
Search for or select the tool you need from categories.
Key Features
100% Free
All tools are completely free. No hidden costs or premium plans.
- Use the tools you need for free anytime
- No hidden payments or subscriptions
- New feature updates are also free
No Signup Required
Use all tools immediately without registration or login.
- Run instantly without login
- No complicated signup process
- Work quickly in your browser
Web Based
Works directly in your browser. No download or installation needed.
- Supports PC, mobile, and tablet
- No installation or download needed
- Multilingual UI for global users
How about these tools?
We randomly recommend tools by category and intent. Open one and start right away.
How It Works
Input Content
Enter text or upload a file. It processes instantly.
Get Result
Copy or download the converted result.
Tool List
Total ToolsCalculator (9)
View all CalculatorFree online calculators for everyday and work needs including date calculator, percentage calculator, and ratio calculator.
Biorhythm Calculator
Enter your birth date to visualize your physical, emotional, and intellectual biorhythm...
Proportion Calculator
Proportion Calculator helps you calculate key values with clear input guidance, practical...
Birthday Weekday Calculator
Enter any date to instantly discover which day of the week it...
Days Lived Calculator
Calculate how many days you've lived since birth. Real-time counter showing hours,...
Percent Calculator
Calculate various percentages easily. Includes basic percent, ratio, change rate, discount, and...
Date Countdown Calculator
Calculate D-Day until your target date with real-time countdown and auto-save.
Date Difference Calculator
Calculate duration between two dates in years, months, weeks, and days with...
Age Calculator
Calculate your exact age in years, months, and days. Discover your zodiac...
Converter (11)
View all ConverterExplore Converter tools to convert values and formats. Each page includes clear input guidance, practical scenarios, and result interpretation notes.
Decimal Time Converter
Convert decimal time like 1.5 hours to 1 hour 30 minutes. Features...
HSL Adjuster
HSL Adjuster helps you convert values and formats with clear input guidance,...
Time Unit Converter
Time Unit Converter helps you convert values and formats in one page...
Color Name Finder
Enter HEX, RGB, or HSL color codes to find the closest color...
Color Mixer
Color Mixer helps you convert values and formats in one page with...
Color Converter
Color Converter helps you convert values and formats with clear input guidance,...
Gallon Barrel Converter
Accurate gallon and barrel converter supporting 5 barrel types: oil, beer, liquid,...
Base Converter
Convert between binary, octal, decimal, and hexadecimal in real-time. Essential tool for...
Developer Tools (18)
View all Developer ToolsFree developer tools for code editing and debugging including JSON formatter, HTML viewer, and regex tester.
SQL Formatter
Format messy SQL queries into readable code with proper indentation. Supports 8...
YAML ↔ JSON Converter
YAML ↔ JSON Converter helps you format and validate code data with...
JWT Decoder
Instantly decode JWT tokens and inspect headers, payloads, and signatures. Provides HMAC...
HTML Viewer
HTML Viewer helps you format and validate code data with clear input...
Color Picker
Professional color picker with color wheel, saturation/brightness controls, HEX/RGB/HSL formats, EyeDropper API,...
Color Contrast Checker
WCAG 2.1 compliant contrast ratio measurement tool. Real-time calculation of text and...
HTML Beautifier
Format minified HTML code for readability. Real-time formatting with indentation options, copy...
CSS Beautifier
Format minified CSS code into readable format. Real-time conversion, indent options, copy...
Finance (7)
View all FinanceFree calculators for financial planning including loan interest, savings interest, and take-home pay calculators.
DTI Calculator
Calculate your Debt-to-Income ratio with QM 43% and Non-QM 50% thresholds. Stress...
Loan Refinance Calculator
Compare your current loan with refinancing options. See monthly savings, interest reduction,...
Personal Loan Interest Calculator
Compare credit loan interest rates by FICO score across credit unions, banks,...
Loan Repayment Calculator
Loan Repayment Calculator. Compare Fixed Payment, Equal Principal, and Interest-Only methods. Features...
Mortgage Calculator
Calculate monthly payments, total interest, and amortization schedules for home loans. Supports...
VAT / Sales Tax Calculator
Calculate net price, VAT/tax, and gross price instantly. Supports UK VAT rates...
Traditional Ratio Unit Calculator
Learn about Wari-Bu-Rin (Japanese) and Hal-Pun-Ri (Korean) - traditional East Asian ratio...
Generator (6)
View all GeneratorExplore Generator tools to generate ready-to-use outputs. Each page includes clear input guidance, practical scenarios, and result interpretation notes.
Random Color Generator
Generate beautiful random palettes with 5 color tones. Features color locking, HEX/RGB/HSL...
Gradient Generator
Free online CSS gradient generator that creates smooth color transitions between two...
Color Palette Generator
Generate harmonious color palettes based on color theory. Supports 4 harmony types:...
QR Code Generator
Generate QR codes from URLs or text. Supports size selection, bulk generation,...
Lorem Ipsum Generator
Generate Lorem Ipsum dummy text by paragraphs, sentences, words, or characters. Supports...
UUID Generator
Free online UUID v4 generator. Supports bulk generation up to 100 UUIDs,...
Health (7)
View all HealthFree online health calculators including BMI calculator, basal metabolic rate, and body fat percentage calculator.
4-7-8 Breathing Guide
Practice the 4-7-8 breathing technique: 4 seconds inhale, 7 seconds hold, 8...
Ideal Weight Calculator
Calculate your ideal body weight based on height, gender, and frame size....
Marathon Pace Calculator
Free online marathon pace calculator. Calculate race pace from target time, predict...
Body Fat Calculator
Calculate body fat percentage using the US Navy Method. Estimates body fat...
Calorie Calculator
Calculate BMR and TDEE for weight management. Supports Mifflin-St Jeor and Harris-Benedict...
Water Intake Calculator
Calculate your daily recommended water intake based on weight, activity level, exercise...
BMI Calculator
Calculate your BMI (Body Mass Index) from height and weight. Get obesity...
Image (8)
View all ImageFree online image editing tools including image resize, format conversion, brightness adjustment, and color extraction.
Brand Color Extractor
Automatically extract and classify Primary/Secondary/Accent colors from logos and brand images. Supports...
Color Balance
Color balance tool with individual RGB channel adjustment, auto white balance (Gray...
Color Inverter (Negative)
Color Inverter (Negative) helps you edit and transform images in one page...
Image Rotate/Flip
Free online image rotate and flip tool. Rotate 90/180 degrees, flip horizontally...
Image Resizer
Easily resize images. Batch process multiple images, output as PNG/JPEG/WebP, adjust quality,...
Image Brightness Adjuster
Image Brightness Adjuster helps you edit and transform images with clear input...
Color Extractor
Color Extractor helps you edit and transform images in one page with...
Base64 Image Converter
Bidirectional conversion between Base64 strings and images. Preview, download, and drag-and-drop support.
Life Calculators & Tools (4)
View all Life Calculators & ToolsExplore Life tools to check everyday planning scenarios. Each page includes clear input guidance, practical scenarios, and result interpretation notes.
Typing Speed Test
Measure your keyboard typing speed in real-time. Check your typing ability with...
EV Charging Cost Calculator
Free EV charging cost calculator for US electric vehicle owners. Compare Level...
EV Ownership Cost Calculator
Calculate the true cost of EV ownership in the USA. Analyze 4-type...
First Birthday Party Planner
Plan your baby's first birthday perfectly with this free online planner. Automatic...
Mini Games (1)
View all Mini GamesBrowse mini games you can play instantly in your browser without installation, with quick access by genre for short breaks, light challenges, and casual fun.
Pregnancy (4)
View all PregnancyFree online calculators for pregnancy and childbirth including due date calculator, pregnancy week calculator, and ovulation calculator.
Baby Formula Calculator
Calculate the right formula amount for your baby based on weight and...
Baby Weaning Calculator
Baby Weaning Calculator helps you estimate pregnancy and childcare figures in one...
Baby Month Calculator
Calculate your baby's age in months from birth date. View developmental milestones,...
Due Date Calculator
Free online due date calculator based on your last menstrual period. Uses...
Text Tools & Utilities (8)
View all Text Tools & UtilitiesExplore Text tools to edit and transform text. Each page includes clear input guidance, practical scenarios, and result interpretation notes.
Emoji Finder & Copier
Quickly search and copy from thousands of emojis. 8 categories, skin tone...
Duplicate Line Remover
Duplicate Line Remover helps you edit and transform text with clear input...
Text Diff Tool
Compare two texts line by line with color-coded display of additions, deletions,...
Text Replacer
Text Replacer helps you edit and transform text with clear input guidance,...
Case Converter
Case Converter helps you edit and transform text with clear input guidance,...
Text Reverser
A tool to reverse text in various ways. Supports 6 modes including...
TXT File Creator
Create and download text files (.txt) directly in your browser. No software...
Character Counter
Count characters, words, sentences, and analyze readability with Flesch scores. Perfect for...
What is ToolZipper?
ToolZipper is a web service that curates practical online calculators, converters, and developer tools for daily life and work. We minimize steps from search to execution for a fast and simple experience.
We focus on a tool experience anyone can understand and use instantly. Instead of complexity, we prioritize clear inputs and readable results so even first-time visitors can solve tasks without friction.
Practical Tool Curation
Not just a list—tools are prioritized by real-world usefulness and problem-solving value.
Fast and Simple UX
Start instantly without signup. Input-to-result flows are designed to save time.
Continuous Quality Improvement
We continuously improve features, content, and accessibility based on feedback and usage data.
- We reduce time from search to result, so users can stay focused on their work.
- We aim to be not a one-time utility, but a trusted standard users return to.
- We keep shipping small improvements every day, so no user pain point is left behind.
ToolZipper keeps improving every day so you can find the right tools faster and use them more effectively.
Frequently Asked Questions
Yes, all tools are 100% free. We believe useful tools should be accessible to everyone. There are no hidden costs or premium plans.
No, you can use all tools immediately without registration or login. Just visit the website and start using.
Favorites are stored in browser cookies. We use this method because login is not required. Note: Deleting browser cookies will also delete your favorites.
All processing happens in your browser. Your input data is not sent to our server, and we do not collect or store it. Use with confidence.
We would love to hear from you! Please report bugs or request new tools through Contact. We actively review all feedback.
Yes, all tools are designed to be responsive and work comfortably on smartphones, tablets, and PCs.
It's built and maintained by a solo independent developer without a company or business registration. I started this to share convenient browser-based tools that work without installing any software. I'm continuously developing new tools and improving existing ones.