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 202 toolsCalculator (52)
View all CalculatorFree online calculators for everyday and work needs including date calculator, percentage calculator, and ratio calculator.
Age Calculator
Calculate your exact age in years, months, and days. Discover your zodiac...
Average Calculator
Paste numbers to calculate the arithmetic mean, median, sum, minimum, maximum, and...
Biorhythm Calculator
Enter your birth date to visualize your physical, emotional, and intellectual biorhythm...
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.
Case Converter
Case Converter helps you edit and transform text with clear input guidance,...
Character Counter
Count characters, words, sentences, and analyze readability with Flesch scores. Perfect for...
Duplicate Line Remover
Remove duplicate lines from text or TXT files in seconds. Includes case-sensitive...
Converter (23)
View all ConverterExplore Converter tools to convert values and formats. Each page includes clear input guidance, practical scenarios, and result interpretation notes.
Base Converter
Convert between binary, octal, decimal, and hexadecimal in real-time. Essential tool for...
Base64 Converter
Encode text or files to Base64, decode strings, and create URL-safe Base64...
Board Foot Calculator
Calculate total board feet from thickness, width, length, and quantity, then compare...
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.
Color Palette Generator
Generate color palettes with complementary, analogous, triadic, and monochromatic schemes. Copy HEX...
Gradient Generator
Free online CSS gradient generator that creates smooth color transitions between two...
Lorem Ipsum Generator
Generate Lorem Ipsum dummy text by paragraphs, sentences, words, or characters. Supports...
Image (20)
View all ImageFree online image editing tools including image resize, format conversion, brightness adjustment, and color extraction.
60:30:10 Color Ratio Analyzer
Upload an image to group similar colors, compare dominant/secondary/accent balance against 60:30:10,...
Aspect Ratio Calculator
Simplify the current aspect ratio and calculate the output size, crop guidance,...
Base64 Image Converter
Bidirectional conversion between Base64 strings and images. Preview, download, and drag-and-drop support.
PDF (14)
View all PDFA collection of PDF tools for compression, watermarking, and page cleanup.
Developer Tools (23)
View all Developer ToolsFree developer tools for code editing and debugging including JSON formatter, HTML viewer, and regex tester.
Binary Calculator
Calculate binary values with arithmetic or bitwise operations, then inspect binary, decimal,...
Color Contrast Checker
WCAG 2.1 compliant contrast ratio measurement tool. Real-time calculation of text and...
Color Picker
Professional color picker with color wheel, saturation/brightness controls, HEX/RGB/HSL formats, EyeDropper API,...
Finance (18)
View all FinanceFree calculators for financial planning including loan interest, savings interest, and take-home pay calculators.
401k Calculator
Project your US 401k balance, employer match, IRS 2026 limits, and a...
APR Calculator
Enter loan amount, nominal rate, term, upfront fees, and recurring monthly charges...
Break-Even Point Calculator
Estimate break-even revenue, required unit sales, margin of safety, and monthly operating...
Health (27)
View all HealthFree online health calculators including BMI calculator, basal metabolic rate, and body fat percentage calculator.
1RM Calculator
Compare 1RM formulas from your lifted weight and reps, then review target...
4-7-8 Breathing Guide
Practice the 4-7-8 breathing technique: 4 seconds inhale, 7 seconds hold, 8...
Apnea-Hypopnea Index (AHI) Calculator
Enter apnea count, hypopnea count, and total sleep time to calculate adult...
Life Calculators & Tools (5)
View all Life Calculators & ToolsExplore Life tools to check everyday planning scenarios. Each page includes clear input guidance, practical scenarios, and result interpretation notes.
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...
Pregnancy (5)
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 from weight and age....
Baby Month Calculator
Calculate your baby's age in months, weeks, and days from birth date....
Baby Weaning Calculator
Baby Weaning Calculator helps you estimate pregnancy and childcare figures in one...
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.
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.