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
HEIC to JPG
Convert iPhone HEIC or HEIF photos to JPG in your browser.
File Tools
WebP to JPG
Convert WebP files to JPG or PNG for broader compatibility.
File Tools
Remove Background
Remove simple image backgrounds and export transparent PNG or WebP.
File Tools
GIF Compressor
Compress animated GIF files by adjusting FPS, size, and color depth.
File Tools
GIF to MP4
Convert GIF animations to MP4 for better performance and compatibility.
File Tools
MP4 to GIF
Convert short MP4 clips to GIF for social sharing and docs.
File Tools
Image Resizer
Resize by dimensions or target size for social and web.
File Tools
Image Mosaic
Generate full-image mosaic effect with adjustable block size and download.
File Tools
Old Photo Restoration
Repair faded vintage photos with noise cleanup, scratch reduction, and color recovery.
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
JPG to PDF
Convert JPG, PNG, or WebP images into a clean multi-page PDF in your browser.
File Tools
Compress PDF
Reduce PDF file size online for uploads, email, and faster document sharing.
File Tools
Split PDF
Extract selected PDF pages into a new document using simple page ranges.
File Tools
Rotate PDF
Rotate all pages or selected page ranges in a PDF and download the corrected file.
File Tools
Delete PDF Pages
Remove selected pages from a PDF and download the cleaned document.
File Tools
PDF to Text
Extract readable text from a PDF and copy or download it as plain text.
File Tools
Add Watermark to PDF
Add text watermarks to every page in a PDF and download the marked file.
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.
File Tools
Hairstyle Try-On
Upload a portrait and preview different hairstyles and hair colors quickly.
Text Tools
Word Counter
Count words, characters, and reading time instantly.
Text Tools
Character Counter
Count characters, characters without spaces, words, lines, and sentences for posts, SEO titles, and form fields.
Text Tools
Emoji Catalog
Explore emojis by category, search by keyword, and copy in one click.
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.
Text Tools
QR Code Generator
Create customizable QR codes from text or links and download as PNG.
Text Tools
Company Lookup Navigator
Search official and commercial business databases from one input.
Text Tools
Roblox Player Lookup
Find public Roblox player profile details by username or user ID.
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
Days From Today Calculator
Add or subtract calendar or business days from any date instantly.
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
Paycheck Calculator
Estimate gross pay, taxes, and take-home pay for each paycheck.
Converters
Pay Raise Calculator
Estimate how a raise changes annual, monthly, and take-home pay.
Converters
Time Card Calculator
Track weekly work hours, overtime, and gross pay from clock-in entries.
Converters
Overtime Pay Calculator
Calculate regular, overtime, and double-time pay with weekly or California-style daily overtime rules.
Converters
1099 vs W-2 Take-Home Calculator
Compare estimated annual value between W-2 and 1099 scenarios with taxes, expenses, and benefits.
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
W-4 Withholding Checkup Calculator
Estimate whether your federal withholding is on track and how much extra withholding may be needed per paycheck.
Converters
HSA Contribution & Tax Savings Calculator
Estimate HSA contribution room, catch-up eligibility, and tax savings from payroll or direct contributions.
Converters
Mileage Deduction Calculator
Estimate business, medical, and charity mileage value with editable standard-mileage rates and parking/toll adjustments.
Converters
Home Electricity Bill Estimator
Estimate a monthly home power bill from state-average electricity rates, kWh usage, fixed fees, and off-peak assumptions.
Converters
EV Charging Cost Calculator
Estimate EV charging cost by U.S. state, compare home vs public charging, and benchmark annual EV savings against gas.
Converters
EV Trip Charging Cost Planner
Estimate charging stops, charging time, and trip cost for long-distance EV travel.
Converters
EV Charge Time Estimator
Estimate charging time and charging cost from start SoC to target SoC.
Converters
EV Home Charger Payback Calculator
Estimate Level 2 charger payback period using home/public charging mix and local rates.
Converters
EV Battery Degradation Estimator
Forecast EV battery health and expected range decline by usage and climate profile.
Converters
Markup & Margin Calculator
Calculate selling price, markup, margin, and profit from cost data.
Converters
IB Buying Power Simulator
Estimate remaining stock buying power from A/B/C positions under simplified margin assumptions.
Converters
ETF Move Recalculator
Estimate ETF fair move from weighted constituent returns, with sentiment adjustment and backsolve for unmodeled weight.
Converters
Options Breakeven & P/L Calculator
Calculate call/put breakeven and expiration profit or loss for single-leg option positions.
Converters
Covered Call Return Calculator
Estimate premium income, called-away return, breakeven, and annualized yield for covered calls.
Converters
Cash-Secured Put Yield Calculator
Calculate cash-secured put premium yield, breakeven, assignment basis, and annualized return.
Converters
Currency Converter
Convert between USD, EUR, GBP, CAD, AUD, JPY, and CNY.
Converters
Periodic Table
Browse all chemical elements with search, family filters, and quick element details.
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.