Qlauson ToolsFree · Testing phase
Qlauson Tools
Small tools. Useful answers. 49 free utilities for AI, development, text, business, design and gaming hardware.
No registration. Your inputs stay in your browser.
49 tools
AI & Prompts 6
AI & Prompts
AI Prompt Builder
Turn a goal, context and requirements into a clear prompt.
Open toolAI & Prompts
AI Token Estimator
Estimate text tokens with a transparent character-based rule.
Open toolAI & Prompts
AI API Cost Calculator
Estimate input and output costs using your own API rates.
Open toolAI & Prompts
System Prompt Builder
Assemble an editable system prompt from clear requirements.
Open toolAI & Prompts
AI Output Evaluation Checklist
Review an AI answer against a checklist you can configure.
Open toolAI & Prompts
AI Use-Case Generator
Generate practical business ideas from deterministic templates.
Open toolDeveloper Tools 15
Developer Tools
JSON Formatter and Validator
Format, minify and check JSON without sending it away.
Open toolDeveloper Tools
UUID Generator
Create one or up to 100 securely random version 4 UUIDs.
Open toolDeveloper Tools
URL Encoder and Decoder
Encode and decode individual URL components safely.
Open toolDeveloper Tools
Base64 Encoder and Decoder
Convert UTF-8 text to standard Base64 and back.
Open toolDeveloper Tools
Unix Timestamp Converter
Convert seconds or milliseconds to dates, or dates to Unix time.
Open toolDeveloper Tools
Regex Tester
Test JavaScript regular expressions with highlighted matches.
Open toolDeveloper Tools
HTML Entity Encoder & Decoder
Encode and decode HTML entities without executing HTML.
Open toolDeveloper Tools
SQL Formatter
Format standard SQL with indentation and keyword casing.
Open toolDeveloper Tools
XML Formatter & Validator
Check XML syntax and format an XML document.
Open toolDeveloper Tools
YAML Formatter & Validator
Validate YAML 1.2 and produce consistent formatting.
Open toolDeveloper Tools
JWT Decoder
Read a JWT header and payload locally as formatted JSON.
Open toolDeveloper Tools
Cron Expression Helper
Validate a cron expression and show five example UTC runs.
Open toolDeveloper Tools
Hash Generator
Generate SHA-256, SHA-384 or SHA-512 hashes of UTF-8 text.
Open toolDeveloper Tools
Markdown Editor & Previewer
Write Markdown and preview a sanitized version.
Open toolDeveloper Tools
CSS Minifier & Beautifier
Parse CSS and minify or beautify its structure.
Open toolText & Data 9
Text & Data
Word and Character Counter
Count words, characters, sentences and paragraphs as you type.
Open toolText & Data
Text Case Converter
Convert text to common writing and programming cases.
Open toolText & Data
Duplicate Line Remover
Remove repeated lines while keeping your chosen occurrence.
Open toolText & Data
Line Sorter
Sort lines alphabetically or numerically with explicit options.
Open toolText & Data
Find & Replace Tool
Replace literal text and see how many replacements were made.
Open toolText & Data
Whitespace Cleaner
Choose whitespace cleanup rules and inspect the resulting text.
Open toolText & Data
CSV to JSON Converter
Convert CSV rows into JSON with reliable quoted-field handling.
Open toolText & Data
JSON to CSV Converter
Convert an array of JSON objects into escaped CSV.
Open toolText & Data
List & Delimiter Converter
Convert quoted lists between common delimiters.
Open toolBusiness & Productivity 8
Business & Productivity
Percentage Calculator
Find percentages, shares and percentage changes.
Open toolBusiness & Productivity
SaaS Subscription Cost Calculator
Compare monthly and annual software spending in one currency.
Open toolBusiness & Productivity
VAT & Sales Tax Calculator
Separate tax-inclusive prices or add a custom tax rate.
Open toolBusiness & Productivity
Discount Calculator
Find discount savings and the final price.
Open toolBusiness & Productivity
Freelance Hourly Rate Calculator
Estimate an hourly rate from annual goals and billable hours.
Open toolBusiness & Productivity
Project Cost Estimator
Add editable work items and expenses to estimate a project total.
Open toolBusiness & Productivity
ROI Calculator
Compare an investment cost with its total benefits.
Open toolBusiness & Productivity
Time-Savings Calculator
Estimate time saved per task and across a chosen period.
Open toolDesign & Web 6
Design & Web
Color Palette Generator
Explore five-color palettes and adjust each HEX value.
Open toolDesign & Web
HEX/RGB/HSL Color Converter
Convert opaque HEX, RGB and HSL colors with a preview.
Open toolDesign & Web
WCAG Color Contrast Checker
Check a foreground/background pair against WCAG text thresholds.
Open toolDesign & Web
CSS Gradient Generator
Build a linear gradient with three editable color stops.
Open toolDesign & Web
CSS Box Shadow Generator
Adjust shadow geometry, color and opacity with a preview.
Open toolDesign & Web
Meta Title & Description Previewer
Preview a title, description and URL with character counts.
Open toolGaming & Hardware 5
Gaming & Hardware
Download Time Calculator
Estimate download duration using file size and connection speed.
Open toolGaming & Hardware
Storage Unit Converter
Convert decimal and binary storage units without mixing their meanings.
Open toolGaming & Hardware
Display PPI Calculator
Calculate pixels per inch from resolution and screen diagonal.
Open toolGaming & Hardware
Aspect Ratio Calculator
Reduce a ratio or calculate a missing width or height.
Open toolGaming & Hardware
PC Power Cost Calculator
Estimate electricity spending from watts and hours of use.
Open toolThis first release is in testing. Found an unexpected result? Tell the Qlauson Team. Usage totals record successful actions, not unique visitors or your entered data.