All Tools
Every UsefulKit utility in one place. Free to use, no signup needed.
File Tools
Image Compressor
Compress JPG, PNG, and WebP files in seconds.
File Tools
Image Converter
Upload once and convert to JPG, PNG, or WebP instantly.
File Tools
Image Resizer
Resize by dimensions or target size for social and web.
File Tools
PNG to JPG
Convert PNG files to JPG with custom quality and background color.
File Tools
JPG to PNG
Convert JPG images to PNG format in your browser.
File Tools
PDF to JPG
Convert PDF pages into high-quality JPG images.
File Tools
Merge PDF
Combine multiple PDF files into one document.
File Tools
PDF Summarizer
Upload a PDF and generate a fast summary with key points.
File Tools
Excel to PDF
Convert .xlsx or .csv sheets into paginated PDF files in your browser.
Text Tools
Word Counter
Count words, characters, and reading time instantly.
Text Tools
Character Counter
Fast character count for posts, ads, and forms.
Text Tools
Case Converter
Switch to lower, upper, title, or sentence case.
Text Tools
Remove Line Breaks
Clean pasted text and remove extra line breaks quickly.
Text Tools
ID List Formatter
Append commas or custom suffix symbols to IDs line by line.
Text Tools
MD5 Tool
Generate and verify MD5 hashes for text inputs.
Date & Time
Age Calculator
Calculate exact age from a date of birth.
Date & Time
Days Between Dates
Find the exact number of days between any two dates.
Date & Time
Time Zone Meeting Planner
Find overlap meeting windows across U.S. and global time zones.
Converters
Unit Converter
Convert length, weight, temperature, and area units.
Converters
Percentage Calculator
Calculate percentages, increase, and decrease easily.
Converters
Tip Calculator
Split bills and calculate tip by percentage.
Converters
Loan Payment Calculator
Estimate monthly payment, total interest, and total repayment.
Converters
Sales Tax Calculator
Calculate tax amount, pre-tax price, and final total in seconds.
Converters
Discount + Tax Calculator
Apply discount first, then calculate sales tax and final checkout total.
Converters
APR Calculator
Estimate annual percentage rate or monthly payment for a fixed-term loan.
Converters
Subscription Waste Finder
Upload CSV and detect recurring charges, duplicates, and possible wasted spend.
Converters
Subscription Downgrade Optimizer
Model ad tiers, annual plans, and bundles to cut recurring subscription costs.
Converters
Quarterly Tax Safe-Pay Planner
Estimate quarterly tax payments and due-date targets for freelancers and side income.
Converters
EV Charging Cost Calculator
Estimate EV charging costs by U.S. state with home/public mix and gas comparison.
Converters
EV Trip Charging Cost Planner
Estimate charging stops, charging time, and trip cost for long-distance EV travel.
Converters
Markup & Margin Calculator
Calculate selling price, markup, margin, and profit from cost data.
Converters
Currency Converter
Convert between USD, EUR, GBP, CAD, AUD, JPY, and CNY.
Health
BMI Calculator
Estimate body mass index using height and weight.
Health
TDEE Calculator
Estimate daily calories based on activity level.
Health
Water Intake Calculator
Estimate daily water needs in cups or liters.