PDF417 vs QR vs Code 128: Which Barcode Should You Use?

Choosing the right barcode for a label, document, or product package determines whether scanning works seamlessly or fails in the field.

Here is a direct comparison of PDF417, QR Codes, and Code 128 to help you choose the best format.

Comparison at a Glance

| Feature | PDF417 | QR Code | Code 128 | | :--- | :--- | :--- | :--- | | Dimension | 2D (Stacked) | 2D (Matrix) | 1D (Linear) | | Max Capacity | ~1,100 bytes (binary) | ~3,000 bytes (binary) | ~80 alphanumeric | | Ideal Shape | Wide & short | Square | Extremely wide & short | | Laser Scanning | Yes (specific scanners) | No (requires camera) | Yes (all lasers & cameras) | | Error Correction | Built-in (levels 0-8) | Built-in (levels L, M, Q, H) | None (parity check only) | | Best For | Shipping, IDs, legacy hardware | Mobile apps, URLs, square layouts | Serial numbers, retail assets |

Code 128: The 1D Standard for Simple Data

Code 128 is a high-density linear (1D) barcode. It only encodes a single row of bars.

• Best use case: Serial numbers, tracking numbers, or retail labels containing 10–30 characters.
• Limitations: If you try to encode more than 50 characters, Code 128 becomes extremely wide. This makes it very difficult to print on small labels and hard to scan.
• Scanning compatibility: Virtually 100% of scanners — including cheap laser scanners — can read Code 128.

PDF417: The Wide Stacked 2D Barcode

PDF417 is a stacked 2D barcode. Instead of a single row, it consists of multiple rows stacked on top of each other.

• Best use case: Shipping labels (FedEx/UPS), boarding passes, and identity documents where you must store a substantial amount of data (up to ~1 KB) without a network connection.
• Advantage over Code 128: It can store much more data in a fraction of the width.
• Advantage over QR: PDF417 has a wide-and-short aspect ratio that fits perfectly along the edges of rectangular shipping labels or documents. It can also be read by some specialized laser scanners that sweep vertically.
• Error Correction: Built-in Reed-Solomon error correction ensures the barcode remains readable even if a part of it is torn or smudged.

QR Code: The Square 2D Standard

QR Code is a matrix 2D barcode arranged in a square grid of dark and light modules.

• Best use case: Consumer scanning, mobile applications, URLs, and square spaces.
• Advantage: Omnidirectional scanning (scans from any angle) and ultra-fast detection. It also handles larger payloads (up to ~3 KB).
• Limitations: Requires a camera-based scanner or smartphone image sensor. Traditional laser scanners cannot read QR codes at all. Its square layout is also harder to fit on narrow/rectangular labels.

Key Decision Factors

1. How much data do you have?
2. Under 20 characters: Use Code 128.
3. 20–1,000 characters: Use PDF417 (rectangular space) or QR Code (square space).

4. Over 1,000 characters: Use QR Code.

5. What scanners will be used?

6. If you must support legacy laser scanners, use Code 128 or a PDF417 configured for rastering scanners.

7. If you are targeting smartphones or modern image scanners, use QR Code or PDF417.

8. What is the layout of your label?

9. Wide, narrow space: Use PDF417 or Code 128.
10. Square space: Use QR Code.

Ready to Generate?

• To generate print-ready PDF417 codes, use our Free PDF417 Generator.
• For automated workflows, check the developer-friendly PDF417 Barcode API.