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4Code, format conversion and barcode generation tools
QR / Barcode
Generate QR codes, barcodes (Code 128, EAN 13, Code 39), and Data Matrix codes online free. No signup, no server upload. Download as PNG or SVG.
Read QR / Barcode
Read and decode QR codes, barcodes, and Data Matrix from uploaded images or paste directly. Free online barcode scanner with multi-format support.
Text to Speech
Convert text to speech online free using Web Speech API. No API key, no server upload. Listen to your text in multiple voices and languages instantly.
Unit Converter
Free online unit converter for length, weight, temperature, volume, and more. Convert between metric and imperial units instantly. Easy to use and accurate.