ZPL vs EPL: what’s the difference?

What is ZPL?

ZPL means Zebra Programming Language. ZPL II formats commonly use ^XA and ^XZ with commands such as ^FO for positioning and ^FD for data. Its command set covers text, graphics and barcode formats; features such as RFID also require suitable printer hardware and firmware. Check the target printer rather than assuming every ZPL command is available.

What is EPL?

EPL means Eltron Programming Language. Here we focus on EPL2 page-mode label formats, with short line-oriented commands such as N, A, B and P. EPL also has a line mode on some printers, which behaves differently. It remains relevant to existing label systems. Supported fonts and barcode symbologies depend on the printer; EPL is not simply a language without 2D barcodes.

The key differences

At a glance, how ZPL and EPL compare:

ZPL and EPL code examples: the same message

These two small layouts print “HELLO” inside a 400 × 240 dot area. They illustrate the structure of each language, not identical typography: the built-in fonts differ. In ZPL, ^XA and ^XZ delimit a format, ^FO positions a field, ^A0 selects a font and ^FD supplies its data. In EPL2, N clears the image buffer, q sets width, Q defines label length and gap, A draws text and P1 requests one copy. The sample EPL gap is 24 dots; adapt it to your stock before a physical test.

^XA
^PW400
^LL240
^FO30,30^A0N,30,30^FDHELLO^FS
^XZ

N
q400
Q240,24
A30,30,0,3,1,1,N,"HELLO"
P1

DPI matters even when the language is correct

Both samples use printer dots. At 203 DPI, 400 dots measure about 50 mm; at 300 DPI, the same 400 dots measure about 34 mm. Changing the language does not automatically preserve physical size. Match the printer resolution, label width, length and media gap before comparing results. Check barcode module widths, quiet zones and text wrapping separately. A label that looks plausible on screen can still be too small for a warehouse scanner or clipped at the printhead edge.

Which language should you choose?

Start with the exact printer model and the software that generates your labels. For an existing EPL workflow that prints correctly, migration is not automatically worthwhile. For a new ZPL-compatible deployment, ZPL can simplify sharing templates with other ZPL systems. List your required fonts, barcodes, graphics and stored formats before choosing. Do not buy or configure a printer on the assumption that every Zebra model accepts both languages. Check its manual, firmware and supported command set; language support can differ within a product family.

How to tell which one you have

You usually need to know which language a file is written in, or which one your printer expects. Quick checks:

• Look at the file: if it starts with ^XA and ends with ^XZ, with ^-prefixed commands, it is ZPL.
• EPL files don’t use ^XA; they start with short line commands like N, Q, q or A and end with a P (print) command.
• Check the exact model manual and its configuration report. On devices supporting SGD, ! U1 getvar "device.languages" reads the language setting. Available values and automatic detection depend on the model and firmware.

Raw code or unexpected characters can also result from line mode, a driver mismatch, diagnostic mode or encoding issues. Follow the guide on garbled output.

A practical EPL-to-ZPL migration checklist

1. Keep the original EPL and a printed reference. Start with one representative label, then test long names, accents, empty fields and your actual barcode data.
2. Convert the file and read every warning. This converter approximates EPL font metrics and does not automatically convert GW/GG/GM graphics. Unsupported commands can be omitted, so a successful conversion is not proof of a complete label.
3. Preview at the target DPI and dimensions. Compare positions, rotation, barcode types, image content and copy count. Rebuild missing graphics or unsupported features explicitly.
4. Print a small sample on the target device and scan the barcodes. Validate against your reference before replacing the production template; keep the original available for rollback.

Frequently asked questions

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