The POSTNET Generator creates a scannable POSTNET barcode image from any text or number you enter, ready to download and use in US ZIP code encoding on mail.
POSTNET (Postal Numeric Encoding Technique) encodes US ZIP and ZIP+4 codes on mail for automated USPS sorting, though it has largely been superseded by the Intelligent Mail Barcode.
Developers, warehouse operators, and businesses use this generator to produce real, standards-compliant barcode images without needing dedicated barcode software.
Different barcode symbologies exist because different industries have different requirements — data density, character support, error tolerance, and printing space all vary by use case. POSTNET was designed and adopted specifically for US ZIP code encoding on mail, which is why it remains the standard choice in that context.
Choosing the right barcode format for your application matters, since scanning equipment and industry standards are often built around a specific symbology.
The defining technical characteristic of this format.
The industry or context where this format is standard.
Generate and download a ready-to-use barcode image.