PRACTICAL BROWSER UTILITIES
Tools that explain what they do.
QuickTools is an independent collection of focused calculators, image utilities, text helpers, and developer tools. Each tool includes instructions, practical notes, and limitations so you can understand the result instead of treating it as a black box.
TOOL LIBRARY
Choose a task
Use the focused utility for the calculation, conversion, image task, or text/developer job you are trying to finish.
Image Compressor
Compress JPEG images in your browser by adjusting quality and downloading a smaller copy.
Open tool →Image Resizer
Resize an image to new dimensions while keeping the workflow simple and browser-based.
Open tool →JPG to PNG Converter
Convert a JPEG image to PNG format in your browser.
Open tool →PNG to JPG Converter
Convert PNG images to JPEG format directly in your browser.
Open tool →WebP Converter
Convert a browser-readable image to compact WebP format.
Open tool →Percentage Calculator
Calculate a percentage of a number and understand the calculation behind the result.
Open tool →Discount Calculator
Calculate the savings and final price after applying a percentage discount.
Open tool →Profit Margin Calculator
Calculate profit, profit margin, and markup from revenue and cost.
Open tool →ROI Calculator
Calculate simple return on investment from an initial investment and final value.
Open tool →Age Calculator
Calculate an age in years, months, and days from a date of birth.
Open tool →Date Difference Calculator
Find the number of days between two calendar dates.
Open tool →Word Counter
Count words, characters, and an approximate reading time while you type.
Open tool →JSON Formatter
Format JSON into an easier-to-read structure and identify parsing errors.
Open tool →Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 text in your browser.
Open tool →URL Encoder & Decoder
Encode or decode text for use in URL components.
Open tool →UUID Generator
Generate random UUID version 4 identifiers in your browser.
Open tool →Unix Timestamp Converter
Convert a Unix timestamp into a readable date and time in your browser.
Open tool →Unit Converter
Convert common length, weight, and data-size units with a simple browser calculator.
Open tool →LEARN
Guides behind the tools
Short explanations help you understand the formulas, formats, and common mistakes behind the result.
How to Calculate Percentages
A practical explanation of percentages, percentage changes, discounts, and common mistakes.
Read guide →How Discount Calculations Work
Understand discount amounts, final prices, and why successive discounts should be calculated step by step.
Read guide →How Image Compression Works
Learn the difference between image dimensions, quality, and file size before compressing a photo.
Read guide →JPG vs PNG vs WebP
A practical comparison of three common image formats and how to choose between them.
Read guide →How to Read and Fix JSON
Understand JSON objects, arrays, strings, commas, and the errors that commonly prevent parsing.
Read guide →Understanding Unix Timestamps
Learn what Unix timestamps represent and how seconds differ from milliseconds.
Read guide →HOW QUICKTOOLS WORKS
Focused pages, not a black box
Each tool has a dedicated interface and a written explanation. The page tells you what the tool calculates or converts, how to use it, and what assumptions or limitations to keep in mind.
For browser-local utilities, the page uses standard browser APIs to process the information needed for the task. QuickTools does not require an account simply to use a calculator or converter.
Before you rely on a result
- Check that your inputs are correct.
- Check the units and date conventions.
- Read the notes on the relevant tool page.
- For important decisions, verify the result against the appropriate authoritative source.
SITE STANDARDS
How we aim to keep the site useful
QuickTools is designed around three principles: the tool should do the task described, the page should explain the result, and navigation should make related tasks easy to find. We avoid requiring registration for ordinary browser utilities and do not present calculator output as professional advice.
If you find an incorrect result, broken link, unclear explanation, or accessibility problem, please contact us with the page and a description of the issue.