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Useful by design
Fast, free, private online tools for everyday tasks.
Useful text, image, calculation and developer tools, free to use in a growing browser-first collection.
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Useful now. More on the way.
30 live tools, a platform ready to grow.
Markdown Viewer
Open and preview Markdown files with GitHub Flavored Markdown, math, code, frontmatter detection and compatibility checks. Private and browser-based.
LiveOpen tool →Word Counter
Count words, characters, sentences and reading time instantly. Free, private and processed in your browser.
LiveOpen tool →Character Counter
Count visible characters, check X and SMS limits, and keep text private in your browser.
LiveOpen tool →Case Converter
Convert text case privately in your browser. Compare writing, developer and fun cases, protect words, copy or download results.
LiveOpen tool →Image Resizer
Resize JPG, PNG and WebP images online for free. Change dimensions by pixels or percentage, process multiple images, and keep your files private in your browser.
LiveOpen tool →Favicon Generator
Create a favicon from an image, text or emoji, preview it at real sizes and download a private browser-generated favicon pack.
LiveOpen tool →Image Compressor
Compress JPG, PNG and WebP images online for free. Batch compress images privately in your browser with no uploads or signup.
LiveOpen tool →Percentage Calculator
Calculate percentages, percentage changes, differences and percentage points instantly. See the formula and what your result means.
LiveOpen tool →Tip Calculator
Calculate restaurant tips, sales tax and penny-perfect split bills online.
LiveOpen tool →Calorie Calculator
Estimate daily calorie needs, BMR, TDEE and macros with visible assumptions and no signup.
LiveOpen tool →Random Number Generator
Generate random numbers privately in your browser with ranges, exclusions, sorting and elimination mode.
LiveOpen tool →Yes No Wheel
Spin a fair Yes, No or Maybe wheel for a quick, private and playful decision.
LiveOpen tool →Currency Converter
Convert currencies using clearly sourced reference exchange rates. See the rate, inverse rate, update time and cache status.
LiveOpen tool →Unit Converter
Convert length, weight, volume, temperature, speed, area and more with browser-local, human-friendly unit conversions.
LiveOpen tool →Decimal to Fraction Converter
Convert decimals and fractions, simplify results and find practical inch approximations locally in your browser.
LiveOpen tool →Mortgage Calculator
Estimate principal, interest, taxes, insurance, PMI and extra-payment impact with transparent assumptions. No signup.
LiveOpen tool →Password Generator
Available on PassRule.
LiveVisit external tool ↗QR Code Generator
Create permanent QR codes locally with no redirect, account or subscription dependency. Check content, digital decoding and print-risk guidance.
LiveOpen tool →Barcode Generator
Create UPC, EAN, Code 128, Code 39 and other barcodes online for free. Validate check digits and download PNG or SVG.
LiveOpen tool →QR Code Scanner
Scan QR codes and barcodes from your camera, screenshots or images with private local decoding and safe link previews.
LiveOpen tool →JSON Formatter
Format and validate JSON without uploading it. Beautify JSON, inspect its structure, fix common errors and keep data in your browser.
LiveOpen tool →JSON Validator
Validate JSON syntax, understand diagnostics and preview safe repairs without uploading your data.
LiveOpen tool →M3U8 Player
Play authorized M3U8 HLS streams, inspect manifests and troubleshoot browser playback locally without a proxy or downloader.
LiveOpen tool →Ecommerce Profit Calculator
Available on MaiJiaTools.
LiveVisit external tool ↗Find your lane.
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Focused
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