Tool directory
All Tools
A growing set of fast utilities with instant, client-side results for writing, finance, development, design, and daily calculations.
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Image Resizer
Resize and compress JPG, PNG, and WebP images.
PrivacyImage Metadata Inspector
Find hidden EXIF and GPS data, then download a clean copy.
MathCalculator
Basic arithmetic with a clean keypad.
SecurityPassword Generator
Strong random passwords with copy support.
ConvertUnit Converter
Length, weight, and temperature conversions.
DateAge Calculator
Age breakdowns for any target date.
HealthBMI Calculator
Metric and US BMI calculations.
WritingWord Counter
Count words, characters, and reading time.
CareerCV Builder
Create a professional CV with live preview.
CareerCover Letter Generator
Generate a polished job application letter.
GenerateQR Code Generator
Create a downloadable QR code.
TextText Case Converter
Convert text case and generate slugs.
MathPercentage Calculator
Calculate percentages and percent changes.
FinanceLoan Calculator
Estimate payment, total, and interest.
DevJSON Formatter
Format, validate, and minify JSON.
EncodeBase64 Encoder Decoder
Encode or decode Base64 text.
EncodeURL Encoder Decoder
Prepare and decode URL-safe text.
DesignColor Converter
Convert HEX, RGB, and HSL values.
DateTimestamp Converter
Convert Unix timestamps and dates.
RandomRandom Number Generator
Generate random numbers in a range.
FinanceTip Calculator
Calculate tips and split bills.
ShoppingDiscount Calculator
Find sale price and savings.
WritingLorem Ipsum Generator
Generate placeholder paragraphs.
DevHash Generator
Generate SHA-256, SHA-1, and SHA-512 hashes.
DevNumber Base Converter
Convert binary, octal, decimal, and hex.
DesignColor Contrast Checker
Check WCAG AA/AAA color contrast.
DevUUID Generator
Create random UUID values.
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Tool Categories
OneTools includes calculators, converters, generators, developer utilities, writing tools, career tools, design helpers, health estimates, and finance calculators. Each utility has a dedicated page, clean URL, focused metadata, FAQ content, and instant browser-based results.
Fast Browser Tools
Most tools run locally in your browser, which keeps results fast and makes common workflows simple. Search by task, filter by category, open a tool, enter your values, and get the result without reloading the page.
How To Choose a Tool
Start with calculators for numbers, converters for units and encoded text, generators for passwords or IDs, writing tools for content cleanup, and career tools like the CV Builder and Cover Letter Generator for professional documents. Developer tools like JSON Formatter, URL Encoder, Base64 Encoder, Timestamp Converter, and UUID Generator are useful when working with APIs, logs, links, and test data.
Focused Tools, Faster Results
Every tool page is built around one clear task, with practical examples, useful guidance, and nearby recommendations when you need to continue the workflow.
One Directory For Everyday Utilities
The tool directory groups calculators, converters, generators, developer utilities, writing helpers, career tools, and finance helpers into a single searchable workspace.
Easy Navigation Across Related Tasks
Each card opens a focused workspace, while contextual related tools help you move naturally to the next calculation, conversion, writing, or developer task.