Shipping Label Guide for India: 4×6 Format, Barcode Placement & Printing

An e-commerce warehouse in Mumbai prepares 200 parcels for dispatch. The orders are packed, courier pickups are scheduled and shipping labels are printed.

But when the pickup agent starts scanning parcels, several barcodes fail. Some labels have been printed too small, while others are folded across carton edges.

The warehouse team must reprint and reattach them, delaying the handover.

The most widely used shipping label format in India for e-commerce parcels is 4×6 inches, approximately 100 × 150 mm. A typical label includes the recipient’s address, airway bill (AWB) number, barcode and courier routing information. The label must be printed at the correct size, remain scannable and be attached securely to the parcel.

Whether a business prints five labels a day on A4 paper or 500 using a thermal printer, the same principles apply.

What Information Should a Courier Shipping Label Include?

A shipping label connects a physical package to its courier booking.

Common information includes:

• Sender and recipient names
• Complete delivery address and PIN code
• Contact details
• Airway bill or tracking number
• Scannable barcode
• Order reference
• Courier name and service type
• Package and COD information where applicable

The barcode allows the courier to identify the shipment at pickup, sorting centres and delivery checkpoints.

A shipping label is different from a GST invoice. The label supports identification and routing, while the invoice records the commercial transaction and applicable taxes.

What Is the Standard 4×6 Shipping Label Size in India?

The 4×6 shipping label format is widely used by Indian e-commerce and courier platforms.

Its exact dimensions are 101.6 × 152.4 mm. Label rolls marketed as 100 × 150 mm are a common near-equivalent, but the printer settings must match the actual stock and file dimensions.

There is no universal Indian requirement that every courier shipment must use a 4×6 label.

Courier partners and marketplaces may prescribe their own formats, routing information and barcode layouts.

How to Print Shipping Labels on A4 Paper

Small businesses do not need to purchase a thermal printer immediately.

An ordinary inkjet or laser printer can produce usable courier labels when the print quality and attachment method are appropriate.

Step 1: Download the Shipping Label

Generate the shipment through the courier portal or marketplace dashboard.

Download the carrier-generated PDF containing the AWB barcode and address information.

Step 2: Print at the Correct Size

If the label appears within an A4 document, print it at the size intended by the carrier.

Avoid using a setting that shrinks the entire page to fit a smaller paper format.

Step 3: Cut and Attach the Label

Cut around the label without removing required margins or routing information.

Attach it to the parcel using an appropriate adhesive-backed sheet or transparent document pouch.

Ensure the barcode lies flat and remains unobstructed.

When Should Small Sellers Switch to Thermal Printing?

There is no fixed shipment-volume threshold.

As a practical starting point, businesses printing fewer than approximately 20 labels per day may find A4 printing manageable.

At 30–50 or more daily shipments, a dedicated thermal printer often becomes easier to justify because it eliminates cutting and individually attaching paper labels.

These are operational guidelines, not mandatory volume limits. The decision depends on labour costs, label costs and available equipment.

How to Choose a Thermal Printer for Shipping Labels

A direct thermal printer uses heat-sensitive paper and does not require ink or toner.

Before purchasing one, evaluate four specifications.

Print width: Choose a model capable of printing at least the full width of the label stock you intend to use. A printer advertised as 4-inch class should be checked for its actual printable width.

Resolution: DPI means dots per inch. A 203 DPI printer is generally sufficient for standard full-size courier labels. A 300 DPI printer may be useful for smaller text or dense barcode layouts.

Connectivity: USB is suitable for one workstation. Ethernet, Wi-Fi or Bluetooth may be useful when several devices need access, subject to software compatibility.

Label compatibility: Check whether the printer supports the desired label rolls or fanfold stock, along with gap or black-mark sensing and suitable adhesive materials.

For most e-commerce operations, a compatible 203 DPI, 4-inch-class direct thermal printer is a practical starting point.

Where Should the Barcode Be Placed?

The AWB barcode should remain flat, visible and easy to scan.

Follow these rules:

1. Place the label on the largest suitable flat surface.
2. Keep the barcode away from carton folds, seams and corners.
3. Preserve the white space on either side of the barcode.
4. Avoid reflective or wrinkled tape over the barcode.
5. Maintain clear black bars against a light background.

The blank margins beside the barcode are called quiet zones.

They help scanners identify where the barcode begins and ends.

A practical rule is simple: nothing should touch or overlap the barcode’s surrounding clear area. The exact margin dimensions depend on the barcode type.

Do not manually stretch, compress or crop the carrier-generated barcode to make it fit another layout.

How to Label Different Types of Courier Packages

Not every parcel has a flat cardboard surface.

Poly Mailers and Soft Packaging

Place the label on a smooth, fully supported section of the mailer.

Avoid positioning it where the bag naturally folds when lifted or where the contents create deep wrinkles.

For small pouches, use an approved smaller label format if the carrier supports one.

Cylindrical Packages

Avoid wrapping a barcode around a narrow curved surface.

Where appropriate, use a flat label pouch or attach an approved tag that provides a sufficiently flat scanning area.

Multi-Box Shipments

A shipment may contain several cartons travelling under one master booking.

Depending on the courier system, each carton may need its own package identifier or child barcode linked to the master AWB.

Do not attach an identical master barcode to every carton unless the carrier specifically instructs you to do so.

Reverse Pickup and Return Labels

Return shipments may require a new AWB or reverse-pickup reference.

The original forward-delivery label should not be reused automatically.

Ensure the return label identifies the correct pickup address, return destination and reverse shipment reference.

Handwritten Shipping Labels

A handwritten address can help identify a package, but it does not replace a carrier-required scannable label.

When an automated booking system is unavailable, use the courier’s approved manual booking process and obtain the required shipment reference.

Why Do Shipping Labels Fail to Print or Scan?

The most common problems usually have straightforward fixes.

1. Barcode Prints Too Small

Cause: An A4 document has been reduced to fit 4×6 label stock.

Fix: Extract the shipping label from the A4 page using the print or crop function, select matching paper dimensions and print at actual size.

2. Barcode Is Too Light

Cause: Insufficient print darkness or unsuitable label stock.

Fix: Increase thermal printer darkness one setting at a time, print a test label and scan it. Avoid excessive darkness, which can make adjacent bars merge.

3. Printer Skips Every Second Label

Cause: The printer’s label sensor is not correctly detecting the gap between labels.

Fix: Run the printer’s media calibration function after loading the roll. Confirm that the selected media type matches gap or black-mark stock.

4. Address or Barcode Is Cut Off

Cause: The PDF size does not match the printer’s configured page size.

Fix: Match the file dimensions, printer driver settings and physical label stock before printing again.

5. Label Prints Blank

Cause: The heat-sensitive side of direct thermal paper may be facing away from the printhead.

Fix: Check the paper orientation. A quick test is to rub a small section of the thermal stock with a fingernail; the printable side will usually darken.

If the original barcode image is blurred or incomplete, regenerate the label through the courier system rather than trying to sharpen a screenshot.

What If a Shipping Label Is Damaged or Lost?

If a label becomes damaged before courier pickup, regenerate and replace it.

If the parcel has already entered the courier network, contact the provider with the AWB number, booking details and package information.

The courier may need to identify and relabel the parcel at an operational facility.

Do not create an unrelated new shipment label for a parcel already moving through the network without the carrier’s instructions. This could introduce conflicting tracking references.

Protect Customer Information

Shipping labels contain personal information, including names, phone numbers and delivery addresses.

Remove or obscure old shipping labels when reusing cartons.

Dispose of rejected labels and customer-address printouts securely rather than placing readable copies in general waste.

Practical Example: How Failed Scans Delay a 500-Order Dispatch

Consider a hypothetical D2C brand processing 500 parcels each day.

Initially, 4% of its shipping labels fail the pre-handover barcode scan.

That means:

500 × 4% = 20 failed labels per day

Assume each failure takes three minutes to investigate, reprint, reattach and scan again.

20 × 3 = 60 minutes of additional handling daily

Across 26 operating days:

60 × 26 ÷ 60 = 26 labour-hours per month

The warehouse introduces three changes:

• Standardised 4×6 printer settings
• Barcode scanning before dispatch
• Flat label placement checks during packing

The label failure rate falls from an illustrative 4% to 1%.

Now only five labels require correction daily.

5 × 3 × 26 ÷ 60 = 6.5 labour-hours per month

Monthly labour time saved: 19.5 hours.

The operational benefit goes beyond labour time.

A label that cannot be scanned at pickup may delay parcel acceptance. If an incorrect or damaged label survives the initial check, it can also create sorting exceptions or shipment identification problems.

The scenario illustrates the potential benefit of standardisation; it is not a documented Bombax customer case, and the improvement is an assumption rather than a guaranteed outcome.

Shipping Label Checklist Before Courier Pickup

Before handing a parcel to the courier, verify:

1. The correct carrier-generated label is attached.
2. The AWB matches the shipment booking.
3. The delivery address and PIN code are accurate.
4. The barcode scans successfully.
5. The label is flat, secure and unobstructed.
6. Every carton in a multi-box shipment is identified correctly.
7. Return shipments carry the appropriate reverse label.
8. Previous labels are removed or obscured.
9. Required invoices and transport paperwork are available separately.

For business consignments, review Bombax’s e-way bill guide to understand related documentation requirements.

How Bombax Supports Shipping Label Generation and Tracking

For businesses managing regular courier dispatches, label accuracy begins with correct booking data.

Bombax offers API-based shipment booking and tracking integration, allowing businesses to connect their internal order systems with courier operations.

Its API integration solution supports automated booking workflows, bulk shipment processing and label generation.

This offers three practical advantages.

Reduced manual entry: Shipment information can flow from a connected business system into the booking process, reducing the need to repeatedly enter order details.

More consistent label generation: API-enabled workflows can generate shipment labels as part of the booking process, helping teams keep shipping references connected to the correct orders.

Tracking linked to physical scans: When a courier scans a valid shipment barcode at pickup and subsequent checkpoints, the AWB can be used to follow that parcel through the tracking network.

Bombax’s surface courier services also provide shipment tracking and visibility for domestic business movements.

For businesses printing high volumes, the important step is to connect booking, label generation, printing and dispatch verification into one repeatable process.

Bombax’s published API information confirms label generation and bulk booking capabilities, but does not establish that every integration supports both 4×6 thermal output and A4 PDF layouts. Businesses should use the actual label file supplied through their selected integration without assuming interchangeability.

Conclusion

Correct shipping labels help courier shipments move through pickup, sorting and delivery with fewer identification problems.

The 4×6 format is widely used in India, but businesses should follow their courier’s approved layout and ensure every barcode is printed clearly.

Small sellers can begin with A4 printing. Higher-volume operations may benefit from thermal printers, automated label generation and pre-dispatch barcode checks.

The goal is not simply to print labels faster. It is to ensure every parcel can be identified correctly from the moment it enters the courier network.

Looking to streamline courier bookings, shipment labels and tracking for your business?

Contact Bombax to discuss domestic courier services and API integration options.

Frequently Asked Questions

1. What is the standard shipping label format in India?

The 4×6-inch format, approximately 100 × 150 mm, is widely used for e-commerce courier shipments. Individual courier platforms may require different approved layouts.

2. Can I print shipping labels on A4 paper?

Yes. Small businesses can print carrier-generated labels on A4 paper, cut them carefully and attach them using a secure adhesive or pouch. The barcode must remain clear and scannable.

3. Is a 203 DPI thermal printer suitable for shipping labels?

Yes. A 203 DPI thermal printer is generally suitable for standard 4×6 courier labels. Higher resolution can be useful for smaller or denser print layouts.

4. Does every carton in a multi-box shipment need its own label?

Every carton should carry the package identification required by the courier. This may involve unique parcel barcodes or labels linked to a master AWB. The same master barcode should not be duplicated without carrier instructions.

5. Can Bombax generate shipping labels through API integration?

Bombax’s published API integration information includes automated label generation, bulk shipment booking and tracking capabilities. The supported output format depends on the implemented booking and integration setup.