What is POSTNET Barcode?
POSTNET (Postal Numeric Encoding Technique) is a barcode standard used by the United States Postal Service (USPS) for mail sorting and automation. It encodes ZIP codes (5, 9, or 11 digits) and is printed on envelopes and mail pieces to enable automated sorting. POSTNET uses tall and short bars to represent digits, making it easy for postal sorting machines to read.
Why Use POSTNET Barcodes?
USPS Standard
Official USPS standard for automated mail sorting, enabling faster and more accurate mail processing.
Faster Delivery
Enables automated sorting, reducing manual handling and speeding up mail delivery times.
Built-in Checksum
Includes checksum digit for error detection, ensuring accurate ZIP code reading by sorting machines.
Bulk Mail
Required for bulk mailings and business mail to qualify for postal discounts and automated processing.
How to Use POSTNET Barcodes
- Enter ZIP Code: Type a 5-digit, 9-digit (ZIP+4), or 11-digit (ZIP+4+2) ZIP code. The checksum is automatically calculated.
- Customize Design: Adjust width scale and height. POSTNET uses specific bar heights (tall and short bars) for encoding.
- Print on Mail: Print POSTNET barcodes on envelopes or mail pieces in the address area, following USPS placement guidelines.
- Verify Placement: Ensure the barcode is positioned correctly according to USPS specifications for automated sorting.
Frequently Asked Questions
POSTNET supports 5-digit ZIP codes, 9-digit ZIP+4 codes, and 11-digit ZIP+4+2 codes (delivery point codes). The system automatically adds the checksum digit for error detection.
POSTNET has been largely replaced by Intelligent Mail Barcode (IMB) for new mailings, but USPS still accepts and processes POSTNET barcodes. IMB is the current standard for new bulk mailings.
POSTNET barcodes should be placed in the address area, typically in the lower right portion of the envelope, below the delivery address. Follow USPS guidelines for exact placement and clear zone requirements.
No, POSTNET is specifically for US mail. It only encodes US ZIP codes. International mail uses different barcode standards specific to each country's postal service.
POSTNET or Intelligent Mail Barcode (IMB) is required for bulk mailings to qualify for postal discounts. IMB is now preferred for new bulk mailings, but POSTNET is still accepted.
POSTNET encodes ZIP codes for sorting. PLANET (Postal Alpha Numeric Encoding Technique) encodes tracking information. Both are USPS standards, but IMB has largely replaced both for new mailings.
POSTNET barcodes should be printed in high contrast (typically black bars) for reliable scanning by postal sorting machines. USPS has specific requirements for barcode contrast and quality.
POSTNET barcodes have specific USPS size requirements. Tall bars should be 0.125" tall, short bars should be 0.050" tall. Follow USPS specifications for exact dimensions and spacing.
POSTNET is not required for personal mail, but it can help speed up processing. It's primarily used for bulk business mail to qualify for postal discounts and automated sorting.
Yes! If you're logged in, you can edit saved POSTNET barcodes and update the ZIP code, colors, size, or other settings. The checksum will be automatically recalculated when you update the ZIP code.
