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Guides, how-tos and tips for getting more out of free online tools.
comparisondeveloper
UUID vs ULID: Which Unique ID Should You Use?
A clear comparison of UUID and ULID — how they differ, when to use each, and the trade-offs in sorting, size and readability.
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PNG vs JPG vs WebP: Which Image Format Should You Use?
A practical comparison of PNG, JPG and WebP — quality, file size, transparency and browser support — so you pick the right format every time.
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JSON vs CSV vs XML: Which Data Format to Use
How JSON, CSV and XML compare for storing and exchanging data — structure, readability, size and best use cases — with free converters.
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How to Remove EXIF & GPS Metadata From Your Photos
Photos carry hidden metadata — including your GPS location. Here's how to strip EXIF data from an image for free, privately, before you share it.
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How to Convert JSON to CSV (Free, No Upload)
A quick guide to converting a JSON array into a clean CSV file you can open in Excel or Google Sheets — with proper escaping and no data upload.
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CM to Inches: The Simple Conversion Guide
How to convert centimeters to inches (and back) with the exact formula, a quick reference table, and a free instant converter.
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20 Best Free Online Tools You Can Use Without Signing Up
A hand-picked list of genuinely useful free online tools — no sign-up, no watermarks, and everything runs privately in your browser.
Read more →How-to guides for every tool
Step-by-step articles for each of our 300+ tools.
⚡ Developer Tools
How to use JSON Formatter & ValidatorHow to use Base64 Encode / DecodeHow to use URL Encoder / DecoderHow to use HTML Entity Encoder / DecoderHow to use JWT DecoderHow to use Hash Generator (MD5, SHA-256, …)How to use UUID GeneratorHow to use NanoID GeneratorHow to use Password GeneratorHow to use Lorem Ipsum GeneratorHow to use Unix Timestamp ConverterHow to use Case ConverterHow to use Color Converter (HEX / RGB / HSL)How to use Regex TesterHow to use CSS Gradient GeneratorHow to use CSS Box Shadow GeneratorHow to use Text Diff CheckerHow to use QR Code GeneratorHow to use URL Slug GeneratorHow to use Number Base ConverterHow to use YAML to JSON ConverterHow to use JSON to YAML ConverterHow to use XML Formatter & ValidatorHow to use CSV to JSON ConverterHow to use JSON to CSV ConverterHow to use Cron Expression ParserHow to use Color Palette GeneratorHow to use Color Contrast Checker (WCAG)How to use CSS Border Radius GeneratorHow to use CSS Clamp() GeneratorHow to use JSON to TypeScriptHow to use URL ParserHow to use String Escape / UnescapeHow to use HTML Formatter & MinifierHow to use CSS Formatter & MinifierHow to use JavaScript FormatterHow to use SQL FormatterHow to use Markdown to HTMLHow to use SVG MinifierHow to use JSON Tree ViewerHow to use HMAC GeneratorHow to use JSON to XML ConverterHow to use Basic Auth Header GeneratorHow to use CSS Flexbox GeneratorHow to use Glassmorphism CSS GeneratorHow to use CSS Text Shadow GeneratorHow to use File Hash / Checksum CheckerHow to use Text Encrypt / Decrypt (AES)How to use JSON Diff CheckerHow to use Aspect Ratio CalculatorHow to use Cron Expression BuilderHow to use CSS Grid GeneratorHow to use CSS Animation GeneratorHow to use Cubic Bezier GeneratorHow to use Markdown Table GeneratorHow to use ULID GeneratorHow to use IP Subnet CalculatorHow to use User Agent ParserHow to use API Tester (REST Client)
📄 PDF Tools
How to use Merge PDFHow to use Split PDFHow to use Delete PDF PagesHow to use Rotate PDFHow to use Images to PDFHow to use Add Page Numbers to PDFHow to use PDF Metadata EditorHow to use PDF Editor — Fill & SignHow to use PDF Text Editor — Edit Existing TextHow to use PDF to ImagesHow to use Extract Text from PDFHow to use Add Watermark to PDFHow to use Reorder PDF Pages
🖼️ Image Tools
How to use Image CompressorHow to use Image ResizerHow to use Image ConverterHow to use Image Rotator & FlipperHow to use Image Filters & EffectsHow to use Meme GeneratorHow to use Image Watermark ToolHow to use Image CropperHow to use Image Color PickerHow to use Image to Base64How to use Favicon GeneratorHow to use Image Info ViewerHow to use Image to Text (OCR)How to use SVG to PNGHow to use Signature PadHow to use Image Color Palette ExtractorHow to use Image to ASCII ArtHow to use Image Metadata RemoverHow to use Base64 to ImageHow to use Circle Image CropperHow to use Image PixelatorHow to use Photo Collage Maker
🎬 Video Tools
🎧 Audio Tools
🤖 AI Tools
How to use AI Text SummarizerHow to use AI Email WriterHow to use AI Text Rewriter & ParaphraserHow to use AI TranslatorHow to use AI Content Idea GeneratorHow to use AI Homework Helper (Photo Solver)How to use AI Paragraph WriterHow to use AI Essay WriterHow to use AI Blog Post GeneratorHow to use AI Blog Outline GeneratorHow to use AI Story GeneratorHow to use AI Poem GeneratorHow to use AI Song Lyrics GeneratorHow to use AI Slogan GeneratorHow to use AI Business Name GeneratorHow to use AI Headline GeneratorHow to use AI Product Description GeneratorHow to use AI Ad Copy GeneratorHow to use AI Elevator Pitch GeneratorHow to use AI Mission Statement GeneratorHow to use AI Instagram Caption GeneratorHow to use AI Tweet GeneratorHow to use AI LinkedIn Post GeneratorHow to use AI YouTube Title GeneratorHow to use AI YouTube Description GeneratorHow to use AI Video Script GeneratorHow to use AI Hashtag GeneratorHow to use AI Cold Email GeneratorHow to use AI Reply GeneratorHow to use AI Review Response GeneratorHow to use AI Thank-You Note GeneratorHow to use AI Apology Letter GeneratorHow to use AI Resignation Letter GeneratorHow to use AI Birthday Wish GeneratorHow to use AI Cover Letter GeneratorHow to use AI Resume Summary GeneratorHow to use AI Bio GeneratorHow to use AI Interview Question GeneratorHow to use AI Interview Answer HelperHow to use AI Concept ExplainerHow to use Explain Like I'm 5 (AI)How to use AI Study Notes GeneratorHow to use AI Quiz GeneratorHow to use AI Flashcard GeneratorHow to use AI Analogy GeneratorHow to use AI Code ExplainerHow to use AI Code GeneratorHow to use AI Regex GeneratorHow to use AI SQL Query GeneratorHow to use AI Excel Formula GeneratorHow to use AI JSON GeneratorHow to use AI Commit Message GeneratorHow to use AI Meta Description GeneratorHow to use AI Keyword GeneratorHow to use AI FAQ GeneratorHow to use AI Tone ChangerHow to use AI Text ExpanderHow to use AI Grammar CheckerHow to use AI Pros & Cons GeneratorHow to use AI Recipe GeneratorHow to use AI Meal Plan GeneratorHow to use AI Workout Plan GeneratorHow to use AI Gift Idea GeneratorHow to use AI Motivational Quote GeneratorHow to use AI Startup Idea GeneratorHow to use AI Math Solver
🔍 SEO Tools
How to use Meta Tag GeneratorHow to use Open Graph GeneratorHow to use Twitter Card GeneratorHow to use Robots.txt GeneratorHow to use Schema Markup GeneratorHow to use Keyword Density CheckerHow to use SERP Snippet PreviewHow to use Readability Score CheckerHow to use Heading Structure AnalyzerHow to use UTM Campaign URL BuilderHow to use XML Sitemap GeneratorHow to use Keyword Combiner
✍️ Writing Tools
How to use Word CounterHow to use Character CounterHow to use Reading Time CalculatorHow to use Remove Duplicate LinesHow to use Remove Empty LinesHow to use Sort Text LinesHow to use Find and Replace TextHow to use Reverse TextHow to use Remove Extra SpacesHow to use Remove Line BreaksHow to use Add Line NumbersHow to use Text RepeaterHow to use Word Frequency CounterHow to use Morse Code TranslatorHow to use Caesar Cipher / ROT13How to use Fancy Text GeneratorHow to use Remove Accents from TextHow to use Title Case ConverterHow to use Bionic Reading ConverterHow to use Text to Binary ConverterHow to use Random Word GeneratorHow to use Palindrome CheckerHow to use Extract Email AddressesHow to use Pig Latin TranslatorHow to use Leetspeak (1337) Converter
💰 Finance Tools
How to use Loan CalculatorHow to use Mortgage CalculatorHow to use EMI CalculatorHow to use Compound Interest CalculatorHow to use Simple Interest CalculatorHow to use Investment Return CalculatorHow to use Savings Goal CalculatorHow to use Retirement CalculatorHow to use VAT CalculatorHow to use Sales Tax CalculatorHow to use Tip CalculatorHow to use Discount CalculatorHow to use Salary CalculatorHow to use Inflation CalculatorHow to use Loan Amortization ScheduleHow to use Credit Card Payoff CalculatorHow to use Net Worth CalculatorHow to use Currency Converter
❤️ Health Tools
How to use BMI CalculatorHow to use BMR CalculatorHow to use Calorie Calculator (TDEE)How to use Body Fat CalculatorHow to use Ideal Weight CalculatorHow to use Macro CalculatorHow to use Water Intake CalculatorHow to use Heart Rate Zone CalculatorHow to use Running Pace CalculatorHow to use Pregnancy Due Date CalculatorHow to use Ovulation CalculatorHow to use Sleep CalculatorHow to use Calories Burned CalculatorHow to use Waist-to-Hip Ratio CalculatorHow to use Blood Alcohol (BAC) CalculatorHow to use Steps to Calories Calculator
🎓 Education Tools
How to use GPA CalculatorHow to use CGPA CalculatorHow to use Grade Percentage CalculatorHow to use Final Grade CalculatorHow to use Weighted Grade CalculatorHow to use Attendance CalculatorHow to use Average Calculator (Mean, Median, Mode)How to use Ratio CalculatorHow to use Roman Numeral ConverterHow to use Number to Words ConverterHow to use Test Grade CalculatorHow to use Scientific Notation ConverterHow to use Fraction CalculatorHow to use GCD & LCM CalculatorHow to use Math Equation Editor (LaTeX)How to use Visual Equation Editor (MathType-style)How to use Factorial CalculatorHow to use Prime Number CheckerHow to use Permutation & Combination CalculatorHow to use Quadratic Equation Solver
💼 Business Tools
How to use Invoice GeneratorHow to use Profit Margin CalculatorHow to use Markup CalculatorHow to use Break-Even CalculatorHow to use ROI CalculatorHow to use Sales Commission CalculatorHow to use Freelance Hourly Rate CalculatorHow to use CAGR CalculatorHow to use Payment Processing Fee CalculatorHow to use Customer Lifetime Value CalculatorHow to use Average Order Value CalculatorHow to use Chart MakerHow to use JSON to ExcelHow to use Word Document GeneratorHow to use Excel to JSONHow to use Excel to CSVHow to use CSV to ExcelHow to use CV / Resume MakerHow to use Meeting Cost CalculatorHow to use Business Card Maker
📱 Social Media Tools
How to use Engagement Rate CalculatorHow to use Hashtag GeneratorHow to use Social Media Character CounterHow to use YouTube Earnings CalculatorHow to use Username GeneratorHow to use Tweet / Thread SplitterHow to use CPM CalculatorHow to use Emoji PickerHow to use Social Media Image Size GuideHow to use YouTube Thumbnail DownloaderHow to use TikTok Money Calculator
✈️ Travel Tools
🧰 Everyday Utilities
How to use Age CalculatorHow to use Date Difference CalculatorHow to use Percentage CalculatorHow to use Unit ConverterHow to use Coin FlipHow to use Dice RollerHow to use Random Number GeneratorHow to use Random Name PickerHow to use Random Team GeneratorHow to use Wheel Spinner (Random Picker)How to use Countdown TimerHow to use StopwatchHow to use Calendar GeneratorHow to use Barcode GeneratorHow to use QR Code ScannerHow to use Password Strength CheckerHow to use NATO Phonetic Alphabet TranslatorHow to use Pomodoro TimerHow to use Scientific CalculatorHow to use Time Duration CalculatorHow to use Timesheet CalculatorHow to use To-Do ListHow to use Length ConverterHow to use Weight / Mass ConverterHow to use Temperature ConverterHow to use Area ConverterHow to use Volume ConverterHow to use Speed ConverterHow to use Time ConverterHow to use Data Storage ConverterHow to use Pressure ConverterHow to use Energy ConverterHow to use Power ConverterHow to use Angle ConverterHow to use Data Transfer Rate ConverterHow to use Frequency Converter