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All tools are completely free. No hidden costs or premium plans.
- Use the tools you need for free anytime
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- New feature updates are also free
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Use all tools immediately without registration or login.
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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
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Tool List
Total 173 toolsCalculator (44)
View all CalculatorFree online calculators for everyday and work needs including date calculator, percentage calculator, and ratio calculator.
Start and End Time Calculator
Calculate end times, reverse-calculate start times, and review break-adjusted work hours and...
Percentage Change Calculator
See percentage change, raw difference, a base-100 index, and the rate needed...
Hydrogen Peroxide Concentration Calculator
Work out hydrogen peroxide stock volume, water amount, and dilution factor from...
Coefficient of Variation (CV) Calculator
Enter a number list or a mean and standard deviation to calculate...
Goal Achievement Rate Calculator
Enter a goal value and current progress to review the current achievement...
Rounding Calculator
Round numbers by decimal places, nearest units, or significant figures and review...
Confidence Interval Calculator
Review t-based mean and Wilson proportion confidence intervals from a sample mean...
Factor Calculator
Enter a positive integer to view the prime factorization, full factor list,...
Converter (21)
View all ConverterExplore Converter tools to convert values and formats. Each page includes clear input guidance, practical scenarios, and result interpretation notes.
International Clothing Size Converter
Compare women's and men's clothing sizes across international labels, UK / US...
Exposure Triangle Calculator
Solve for ISO, shutter speed, or aperture from scene EV, then compare...
Frequency ↔ Period Converter
Convert frequency (Hz) and period (seconds) in real time, with Hz, kHz,...
Power ↔ dBm Converter
Convert dBm, mW, and W on one screen with quick presets, instant...
Roman Numerals Converter
Convert numbers and Roman numerals both ways, then review standard notation, subtractive...
Oz to Cups Converter
Convert fluid ounces (fl oz) into US cups, 250 mL cups, mL,...
Board Foot Calculator
Calculate total board feet from thickness, width, length, and quantity, then compare...
Volume Unit Converter
Volume Unit Converter compares mL, L, cc, m³, metric kitchen measures, and...
Developer Tools (23)
View all Developer ToolsFree developer tools for code editing and debugging including JSON formatter, HTML viewer, and regex tester.
Hex Calculator
Calculate two hexadecimal values and review arithmetic or bitwise results in hex,...
CSV ↔ JSON Converter
Online CSV ↔ JSON converter. Control headers, delimiters, and empty/null rules, review...
Binary Calculator
Calculate binary values with arithmetic or bitwise operations, then inspect binary, decimal,...
CSV Header Extractor
Extract CSV header rows, review delimiter detection plus duplicate or empty column...
UTF-8/UTF-16 Byte Calculator
Compare UTF-8 and UTF-16 byte size with optional BOM handling, then inspect...
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...
Finance (17)
View all FinanceFree calculators for financial planning including loan interest, savings interest, and take-home pay calculators.
Break-Even Point Calculator
Estimate break-even revenue, required unit sales, margin of safety, and monthly operating...
Overdraft Interest Calculator
Estimate overdraft interest by daily balance in USD, including a 30-day equivalent...
Savings Calculator
Enter current savings, monthly contributions, expected return, and a target amount to...
FHA Loan Calculator
Estimate monthly housing cost and cash to close for an FHA 1-unit...
Roth IRA Calculator
Calculates 2026 Roth IRA contribution room from IRS limits, MAGI phase-out rules,...
APR Calculator
Enter loan amount, nominal rate, term, upfront fees, and recurring monthly charges...
Mutual Fund Calculator
Model a mutual fund plan with ending balance, cost drag, required monthly...
401k Calculator
Project your US 401k balance, employer match, IRS 2026 limits, and a...
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 color palettes with complementary, analogous, triadic, and monochromatic schemes. Copy HEX...
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 (15)
View all HealthFree online health calculators including BMI calculator, basal metabolic rate, and body fat percentage calculator.
Height Calculator
Convert height between feet/inches and centimeters, see meters and total inches, and...
Golf Calorie Calculator
Estimate golf calories burned from your weight, play time, and activity type....
1RM Calculator
Compare 1RM formulas from your lifted weight and reps, then review target...
Dew Point Calculator
Calculate dew point from air temperature and relative humidity, then review muggy-air...
Wind Chill Calculator
Estimate wind chill, air-temperature drop, frostbite risk bands, and exposed-skin caution time...
Heat Index Calculator
Enter air temperature and relative humidity to estimate shaded heat index, NWS...
HAS-BLED Calculator
Review HAS-BLED bleeding risk factors in atrial fibrillation and see the total...
Apnea-Hypopnea Index (AHI) Calculator
Enter apnea count, hypopnea count, and total sleep time to calculate adult...
Image (19)
View all ImageFree online image editing tools including image resize, format conversion, brightness adjustment, and color extraction.
Aspect Ratio Calculator
Simplify the current aspect ratio and calculate the output size, crop guidance,...
Face Blur Tool
Blur or pixelate faces, license plates, and sensitive text with click or...
Image Border Generator
Add a border outside, center, or inside any image, adjust thickness, color,...
Image Text Watermark Generator
Add text watermarks to images in real time, adjust size, color, angle,...
60:30:10 Color Ratio Analyzer
Upload an image to group similar colors, compare dominant/secondary/accent balance against 60:30:10,...
Vignette Add & Remove
Upload a photo, switch between adding or removing a vignette, adjust strength,...
Temperature & Tint Adjuster
Adjust photo temperature from cooler to warmer and tint from green to...
Black and White Photo Filter
Upload a photo, convert it to black and white, adjust intensity, contrast,...
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.
PDF (10)
View all PDFA collection of PDF tools for compression, watermarking, and page cleanup.
PDF Compressor
Compress a PDF entirely in your browser, choose Quality First, Balanced, or...
PDF Page Deleter
Remove unwanted PDF pages with thumbnail review, range selection, and browser-only processing....
PDF Black and White Converter
Convert a color PDF to grayscale or pure black and white, export...
PDF to Image Converter
Save each page of a PDF as PNG, JPG, or WebP while...
PDF Page Rotator
Rotate selected PDF pages one by one or by range, fix mixed...
Image to PDF Converter
Convert multiple images into one PDF, adjust page size, orientation, margins, and...
PDF Merger
Combine multiple PDFs in your chosen order, review first-page previews, and save...
PDF Page Reorder
Reorder PDF pages with drag-and-drop, up/down controls, and slot-based moves, then preview...
Pregnancy (5)
View all PregnancyFree online calculators for pregnancy and childbirth including due date calculator, pregnancy week calculator, and ovulation calculator.
IVF Due Date Calculator
Estimate your IVF due date from embryo transfer day or a fresh-cycle...
Baby Formula Calculator
Calculate the right formula amount for your baby from weight and age....
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, weeks, and days from birth date....
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
Remove duplicate lines from text or TXT files in seconds. Includes case-sensitive...
Text Diff Tool
Compare two texts line by line with color-coded display of additions, deletions,...
Text Replacer
Find and replace text online with preview before applying, plus options for...
Case Converter
Case Converter helps you edit and transform text with clear input guidance,...
Text Reverser
Reverse text by character, word, line, or sentence, check palindromes, and generate...
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.