Search Free Online Tools
Explore developer, finance, image, PDF, and text tools available on Flowtooly.
Developer Tools
JWT Decoder
Decode JWT tokens instantly in your browser. View header and payload for debugging and inspection without uploading any data.
Password Generator
Generate strong, random, and secure passwords instantly. Customize length and character types to create safer passwords for any use.
UUID Generator
Generate UUIDs instantly in multiple versions such as v1, v4, and v7. Ideal for developers, databases, testing, and unique identifiers.
Base64 Encoder & Decoder
Encode or decode Base64 instantly in your browser. Supports text conversion with no data uploaded.
URL Encoder & Decoder
Encode or decode URLs instantly in your browser. Useful for debugging query strings, web development, and API integrations.
JSON Formatter & Validator
Format, minify, and validate JSON instantly in your browser. Improve readability, detect syntax errors, and debug JSON data easily.
YAML ⇄ JSON Converter
Convert YAML to JSON or JSON to YAML instantly in your browser. Ideal for DevOps, backend developers, and configuration files.
HTML Escape & Unescape
Escape or unescape HTML characters instantly. Convert special characters to HTML entities to display content safely and prevent XSS issues.
Regex Tester
Test and debug regular expressions instantly in your browser. Supports flags, match highlighting, and live results for easier regex development.
URL Parser
Parse a URL into its components, query parameters, and fragments instantly. Useful for developers to analyze and debug URL structures.
Color Converter (HEX, RGB, HSL)
Convert colors between HEX, RGB, and HSL formats instantly. Includes color picker, live preview, and copy-friendly outputs for developers and designers.
Image Tools
Image Converter
Convert images between popular formats such as JPG, PNG, WebP, and AVIF instantly in your browser.
Image Resizer
Resize images to exact dimensions in pixels. Perfect for websites, social media, and design requirements.
Image Cropper
Crop images with flexible aspect ratios to focus on specific areas. Ideal for avatars, thumbnails, and social media content.
Image Rotate
Rotate images instantly to fix orientation or adjust layout. Supports common rotation angles for photos and graphics.
Image to PDF
Convert one or multiple images into a clean PDF document instantly in your browser.
Image Metadata Viewer (EXIF Data Reader)
View image metadata including EXIF data, camera information, resolution, color details, and GPS coordinates directly in your browser. No upload required.
Placeholder Image Generator
Generate customizable placeholder images with specific dimensions, colors, and text for UI design, prototyping, and web development.
PDF Tools
PDF Merge
Combine multiple PDF files into a single document quickly and securely in your browser.
PDF Split
Split PDF pages into separate files easily and securely directly in your browser.
PDF Generator
Generate invoices, certificates, and custom PDF documents quickly using structured data directly in your browser.
Financial Tools
Cash Counter
Calculate cash totals quickly by denomination. Ideal for daily cash reconciliation, balance checking, and small business operations.
COGS & Profit Margin Calculator
Calculate Cost of Goods Sold (COGS), Gross Profit Margin, and Markup percentage to optimize your pricing strategy and business profitability.
Product HPP Calculator
Calculate product cost of goods sold (COGS) based on materials, packaging, labor, and overhead. Ideal for SMEs, food businesses, and handmade creators.
Financial Simulator
Simulate income, expenses, and financial scenarios starting from an initial balance. See how your money grows or declines over time based on different actions.
Loan Calculator – Flat & Effective Interest
Calculate loan installments, total interest, and repayment using flat or effective (annuity) interest methods. Fast, accurate, and privacy-friendly.
Investment Return Calculator (CAGR)
Calculate your investment's annual growth rate using the CAGR formula. Understand long-term investment performance based on your initial value, final value, and duration.
Savings Goal Calculator
Calculate how much you need to save each month to reach your financial goal. Supports interest growth for accurate future value planning.
Retirement Savings Estimator
Estimate how much you need to save each month to reach your retirement goal based on your age, current savings, target retirement age, and expected annual return.
Asset Allocation Calculator
Visualize how your assets are distributed across categories and see their percentage composition based on your inputs.
Percentage Calculator (Increase, Decrease & Difference)
Free percentage calculator to calculate percentage of a value, percentage increase, decrease, and percentage difference. Ideal for business, finance, and education.
Compound Interest Calculator
Calculate compound interest easily and see how your investments grow over time. Supports recurring contributions, multiple compounding periods, and long-term projections.
Text Tools
Case Converter
Convert text to uppercase, lowercase, Title Case, or Sentence case instantly. All processing happens locally in your browser.
Word Counter
Count words and characters instantly in your text. Perfect for writing, assignments, and content creation with full privacy.
Remove Duplicate Lines
Remove duplicate lines from text instantly to keep only unique lines. Clean, fast, and processed locally in your browser.
Text Diff
Compare two text blocks and instantly see added, removed, or changed content. Fast, simple, and fully private.
URL Extractor
Extract all URLs from any text instantly. Fast, accurate, and fully processed locally in your browser.
Slug Generator
Convert any text into a clean, URL-friendly slug instantly. Ideal for blogs, SEO, and clean URL structures.
Lorem Ipsum Generator
Generate random Lorem Ipsum placeholder text instantly. Ideal for design mockups, UI testing, and content layout.
Math Tools
Square Calculator (Area & Perimeter)
Calculate the area and perimeter of a square based on its side length. Includes formulas, visual illustration, and interactive practice questions.
Rectangle Calculator (Area & Perimeter)
Calculate the area and perimeter of a rectangle based on its length and width. Includes formulas, visual illustration, and interactive practice questions.
Triangle Calculator (Area, Hypotenuse & Perimeter)
Calculate the area, hypotenuse, and perimeter of a right triangle using base and height. Includes formulas, visual illustration, and interactive practice questions.
Circle Calculator (Area & Circumference)
Calculate the area and circumference of a circle using its radius. Includes formulas, visual illustration, and interactive practice questions.
Trapezoid Calculator (Area & Perimeter)
Calculate the area and perimeter of a trapezoid using parallel sides, height, and non-parallel sides. Includes formulas, visual illustration, and interactive practice questions.
Parallelogram Calculator (Area & Perimeter)
Calculate the area and perimeter of a parallelogram using base, height, and side length. Includes formulas, visual illustration, and interactive practice questions.
Rhombus Calculator (Area & Perimeter)
Calculate the area and perimeter of a rhombus using diagonals and side length. Includes formulas, visual illustration, and interactive practice questions.
Kite Calculator (Area & Perimeter)
Calculate the area and perimeter of a kite using diagonals and equal side lengths. Includes formulas, visual illustration, and interactive practice questions.
Semicircle Calculator (Area & Perimeter)
Calculate the area and perimeter of a semicircle based on its radius. Includes formulas, visual illustration, and interactive practice questions.