Interactive Coordinate Engine

Interactive 4×6 PDF Label Cropper & Custom Courier Bounding-Box Tool

Designed for multi-channel dispatchers shipping via Delhivery, BlueDart, Shadowfax, Shiprocket, Xpressbees, Ecom Express, and India Post. Manually drag, resize, rotate, and multi-select custom crop regions on any A4 or Letter PDF manifest with real-time 4×6 thermal preview.

Interactive PDF Coordinate & Multi-Box Cropping Specifications

Parameter	Standard Specification	Engineering & Fulfillment Note
Coordinate Precision	0.1% Normalized Page Ratio (Sub-millimeter)	Supports arbitrary aspect ratios mapped cleanly onto 100×150 mm thermal pages.
Multi-Box Extraction	Up to 4 Independent Crop Zones per Page	Extract both the top shipping label and bottom packing slip or 2-up/4-up quadrant labels in one pass.
Rotation Normalization	0°, 90°, 180°, 270° Lossless Page Orientation	Automatically rotates landscape FBA or courier airway bills into portrait 4×6 orientation.
Supported Couriers	Delhivery, Shiprocket, BlueDart, Ecom Express, DTDC	Works with any custom ERP, Shopify, WooCommerce, or 3PL aggregator PDF layout.

Custom Bounding-Box Calibration for Aggregators & 3PL Manifests

While marketplaces like Meesho and Flipkart follow standardized A4 split ratios, third-party logistics aggregators such as Shiprocket, Pickrr, NimbusPost, Shyplite, and direct courier portals (Delhivery One, BlueDart, DTDC) allow merchants to customize label templates. Depending on whether SKU tables, company logos, or COD collect banners are enabled, the label height can vary from 42% to 65% of the A4 sheet.

The Interactive 4×6 PDF Label Cropper provides eight-point drag handles and an intelligent content-bounding auto-detector. When you click Auto-Detect, the engine scans pixel luminance across the rendered page to locate the exact outer black border of the shipping slip while ignoring empty bottom paper margins.

Dual-box mode lets you extract 2-up labels printed side-by-side or stacked vertically on a single A4 page.
Independent per-edge margin sliders (Top, Bottom, Left, Right in millimeters) prevent thermal printhead clipping.
Page Range Filter supports Odd pages only, Even pages only, or custom ranges (e.g., 1-15, 18, 22-50) for mixed manifests.

Preventing Aspect-Ratio Distortion on 100×150 mm Thermal Rolls

A common mistake when cropping custom courier slips is stretching a wide horizontal slip to fill a portrait 4×6 label, which warps barcode bar-to-space ratios. CropLabel preserves the native aspect ratio of your selected bounding box, centering it within the 4×6 canvas and applying uniform white quiet-zone padding.

How to Calibrate a Custom Courier Label Crop

Step 1: Load Your Aggregator or Courier PDF Drop your Shiprocket, Delhivery, or custom ERP shipping manifest into the interactive workbench.

Step 2: Drag the Blue Bounding Handles or Run Auto-Detect Position the crop rectangle tightly around the outer border of the airway bill, including the return address and barcode.

Step 3: Add a Secondary Crop Box for 2-Up Sheets (Optional) If your manifest contains two labels per A4 page, click "+ Add Crop Box" to capture both labels into separate 4×6 pages.

Step 4: Verify Orientation & Export Use the 90° rotation controls if your label is sideways, then click Crop & Download PDF.

Technical Q&A & Related Guides

Can I extract two shipping labels printed on the same A4 sheet into two separate 4×6 pages?

Yes. Click the "+ Add Crop Box" button in the toolbar to place a second bounding box on the lower half of the page. When exported, each box becomes its own full-size 4×6 thermal page in sequential order.

How do I save my custom crop coordinates for tomorrow’s dispatch?

CropLabel automatically remembers your active margin settings and allows you to re-apply your exact bounding box across unlimited PDF files in your session.

Read Full Guide: Barcode Quiet Zones & Vector Clarity Rules →