Developer & Utilities
62 tools · No registration · Temporary file processing
TCP Port CheckerTCP Port Checker with server-side checks of public network targets and result export.Online StopwatchOnline Stopwatch, processed in your browser with copy and download.Online Alarm ClockSet an alarm using the device clock, with sound previews and timed or looping ringing.Keyboard TestKeyboard Test with local browser interaction and inspection.Keyboard KeyCode ReferenceKeyboard KeyCode Reference with local browser interaction and inspection.Mouse Button TestMouse Button Test with local browser interaction and inspection.Screen TestScreen Test with local browser interaction and inspection.Microphone TestMicrophone Test with explicit, local browser inspection or testing.Webcam TestWebcam Test with explicit, local browser inspection or testing.Mortgage CalculatorCommercial, housing-fund and combined loans with independent terms, equal-payment/equal-principal schedules and monthly detail. User-entered fixed rates are estimates, not bank quotes.Batch Barcode GeneratorBatch Barcode Generator from text or CSV, with PNG/SVG images, ZIP and print sheet downloads.BMI CalculatorLocal height/weight calculation using Chinese adult WS/T 428—2013 categories. For initial screening of non-pregnant adults aged 18+, not diagnosis.Batch Barcode ReaderRead multiple codes from batches of images, copy contents and export CSV or JSON.Batch QR Code GeneratorBatch QR Code Generator from text or CSV, with PNG/SVG images, ZIP and print sheet downloads.