21K Tools とは？
Most free online tools are slow, ad-stuffed, or sketchy with your files. We built 21K Tools because we got tired of that. Everything runs in your browser, your files never leave your device. No account needed, no paywalls, no tracking. Tools available: → URL Shortener with analytics & QR codes → QR Code Generator & Scanner → PDF Toolkit — merge, split, compress, convert → File Converter — 100+ formats → Image Resizer & Compressor → Age & Time Calculator → Interest Calculator → Unit Converter
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