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Free browser-based PDF, image, converter, calculator, text, QR code and domain tools. Designed to be fast, clear and easy to use.
Domains
2026 US Paycheck & Income Tax Calculators by State
Looking for a free paycheck calculator, take-home pay estimator, state income tax calculator, or 2026 tax brackets? Choose your US state to start. We show federal income tax and Social Security/Medicare separately, and clearly identify states where local income taxes are not yet calculated.
Read the full 2026 US tax calculator guide, rates, instructions and sources. Educational estimates only, not precise W-4 withholding or a replacement for payroll software.
Calculators
Percentage Calculator
Calculate percentages, percentage increase, decrease and change.
CalculatorsScientific Calculator
A fast browser-based calculator for common scientific expressions.
CalculatorsDiscount Calculator
Calculate sale price and savings from an original price and discount percentage.
CalculatorsPercentage Change Calculator
Calculate percentage increase or decrease between two values.
CalculatorsAverage Calculator
Calculate the arithmetic mean of a list of numbers.
CalculatorsDate Difference Calculator
Calculate the number of days between two dates.
Converters
Weight Converter
Convert kilograms, grams, pounds and ounces.
ConvertersLength Converter
Convert metric and imperial length units.
ConvertersTemperature Converter
Convert Celsius, Fahrenheit and Kelvin.
ConvertersPressure Converter
Convert Pa, kPa, MPa, bar, mbar, atm, psi, kgf/cm² and mmHg.
ConvertersVolume Converter
Convert liters, milliliters, cubic meters, gallons and cups.
ConvertersArea Converter
Convert square meters, square feet, hectares and acres.
Images
Image Resizer
Resize an image locally in your browser without uploading it.
ImagesImage Compressor
Compress JPG, PNG or WebP images locally in your browser.
ImagesImage Cropper
Crop an image to custom coordinates and dimensions in your browser.
ImagesImage Converter
Convert images to PNG, JPG or WebP locally in your browser.
ImagesAnimated GIF Resizer
Resize animated GIF files in your browser while keeping their animation and frame timing.
ImagesGIF to Frames
Extract every frame from an animated GIF and download the frames as PNG images.
ImagesTIFF to PNG
Convert single-page or multi-page TIFF/TIF images into PNG files locally in your browser.
ImagesSVG Optimizer
Reduce SVG markup size while keeping the image as editable vector graphics.
ImagesBackground Remover
Remove simple solid or near-solid image backgrounds in your browser and export a transparent PNG.
ImagesJPG to PNG
Convert a JPG photo into a PNG image.
ImagesPNG to JPG
Convert PNG to JPG with a solid background.
ImagesWebP to JPG
Convert WebP images to JPG for compatibility.
ImagesJPG to WebP
Convert JPG images to WebP for the web.
Merge PDF
Combine multiple PDF files into one PDF directly in your browser.
PDFSplit PDF
Split a PDF into separate single-page PDF files locally in your browser.
PDFCompress PDF
Reduce PDF size by rebuilding pages as compressed images. Best for visual PDFs.
PDFPDF to Text
Extract selectable text from a PDF and download it as a TXT file.
PDFPDF to Word
Convert PDF to Word with a layout-preserving mode for tables, fonts, images and page design, plus an editable-text mode.
PDFPDF to Excel
Extract PDF text into an XLSX workbook, with one worksheet per PDF page.
PDFPDF to Images
Render PDF pages as downloadable PNG images in your browser.
PDFImages to PDF
Combine JPG or PNG images into a single PDF document locally.
PDFJPG to PDF
Convert one or more JPG images into a PDF document directly in your browser.
PDFPDF to JPG
Render PDF pages as JPG images directly in your browser.
PDFPDF Page Remover
Remove selected pages from a PDF and download a new PDF with the remaining pages.
Text
Word Counter
Count words, characters, lines and spaces instantly.
TextText Case Converter
Convert text to upper case, lower case, title case or sentence case.
TextRemove Duplicate Lines
Remove repeated lines while keeping the first occurrence.
TextRemove Extra Spaces
Clean repeated spaces and unnecessary blank lines.
TextSort Lines
Sort text lines alphabetically in ascending or descending order.
TextFind & Replace
Find text and replace all matching occurrences instantly.
TextCharacter Counter
Count characters, words, lines and sentences in text instantly.
Generators
QR Code Generator
Generate a QR code from text or a URL.
GeneratorsPassword Generator
Generate strong random passwords locally in your browser.
GeneratorsRandom Number Generator
Generate a random integer between a minimum and maximum value.
GeneratorsUUID Generator
Generate UUID v4 identifiers locally in your browser.
GeneratorsRandom Picker
Pick one random item from a list of choices.
New popular tools
Background Remover
Remove simple image backgrounds in your browser.
PopularJPG to PDF
Convert one or more JPG images into a PDF.
PopularPDF to JPG
Render PDF pages as JPG images.
PopularCharacter Counter
Count characters, words, lines and sentences.
PopularPDF Page Remover
Remove selected pages from a PDF.
Popular image and salary utilities
Fast, practical tools with clear instructions and no paid accounts.
Prepare student documents with confidence
Free PDF and image tools, realistic conversion limitations and a submission checklist.
Free online tools for real everyday tasks
Usefulia brings practical PDF, image, unit conversion, calculator, text, QR code and domain tools into one clear website. Each page is built around a specific job: merge a PDF, resize an image, convert a file, check a domain or calculate a value without installing a large desktop application.
Many operations are designed to run directly in the browser. That can make common tasks faster and, when a tool works locally, avoids sending the selected file to an external conversion server. We also explain important limitations so you know what a tool can and cannot preserve before you use the result.
Popular file conversion tools
Popular calculators and text tools
Learn before you convert
Usefulia also publishes practical guides about PDF files, image formats, compression, resolution and online privacy. The goal is to help you choose the right tool and understand the trade-offs between file size, compatibility, editability and visual quality.