REST API
Integrate label conversion, generation, and processing directly into your warehouse management systems (WMS) or ERPs. Built for speed and reliability.
Scale to millions of labels generated per day.
Sub-100ms latency for real-time operations.
Geographic redundancy and latency-based routing.
Your first label, this afternoon.
Official LabelZoom libraries for .NET, Node, Java, Python, PHP, Go, Ruby and Rust. Install one package, write one line, get a label back — no HTTP plumbing to build and maintain.
npm install @labelzoom/sdkconst client = new LabelZoomClient(); const label = await client.convert() .fromZpl(zpl) .toPdf() .execute();
Try it before you sign up
No API key required to get started. Install the library, run the example, and you'll have a real label back in minutes — add your key when you're ready to go to production.
The same everywhere
Every library is tested against one shared suite before release, so they all behave identically. Teams running Java in the warehouse and Python in the back office get the same results from the same labels.
Every format, both directions
ZPL, EPL, TSPL, DPL, IPL, SBPL, PDF, images, XML and JSON — convert into any of them and back out again. One library covers every printer language your sites use, not just the one you started with. See the full conversion matrix. Primarily working with ZPL? Start at the dedicated ZPL API page.
Working in another language? The API is a standard REST call from anything that can make one — see the documentation. Every library above is checked against the same shared conformance suite, so the wire behaviour is identical whichever you pick.
Any label format in, any label format out.
Ten formats, every combination, one API call. Pick a source on the left and a target along the top — highlighted cells open a free online converter, so you can check the output on your own labels before writing any code.
| From ↓ To → | XML | JSON | Images | ZPL | DPL | EPL | IPL | SBPL | TSPL | |
|---|---|---|---|---|---|---|---|---|---|---|
| XML | XML to XML: API | XML to JSON: API, paid plans only | XML to Images: API | XML to PDF: API | XML to ZPL: API | XML to DPL: API | XML to EPL: API | XML to IPL: API | XML to SBPL: API | XML to TSPL: API |
| JSON | JSON to XML: API | JSON to JSON: API, paid plans only | JSON to Images: API | JSON to PDF: API | JSON to ZPL: API | JSON to DPL: API | JSON to EPL: API | JSON to IPL: API | JSON to SBPL: API | JSON to TSPL: API |
| ImagesPNG, JPEG, GIF, BMP | Images to XML: API | Images to JSON: API, paid plans only | Images to Images: API, paid plans only | Images to PDF: API, paid plans only | Images to ZPL: free online converter | Images to DPL: free online converter | Images to EPL: free online converter | Images to IPL: free online converter | Images to SBPL: free online converter | Images to TSPL: free online converter |
| PDF to XML: API | PDF to JSON: API, paid plans only | PDF to Images: API, paid plans only | PDF to PDF: API, paid plans only | PDF to ZPL: free online converter | PDF to DPL: free online converter | PDF to EPL: free online converter | PDF to IPL: free online converter | PDF to SBPL: free online converter | PDF to TSPL: free online converter | |
| ZPL | ZPL to XML: API | ZPL to JSON: API, paid plans only | ZPL to Images: free online converter | ZPL to PDF: free online converter | ZPL to ZPL: API | ZPL to DPL: API | ZPL to EPL: API | ZPL to IPL: API | ZPL to SBPL: API | ZPL to TSPL: API |
| DPL | DPL to XML: API | DPL to JSON: API, paid plans only | DPL to Images: free online converter | DPL to PDF: free online converter | DPL to ZPL: free online converter | DPL to DPL: API | DPL to EPL: API | DPL to IPL: API | DPL to SBPL: API | DPL to TSPL: API |
| EPL | EPL to XML: API | EPL to JSON: API, paid plans only | EPL to Images: free online converter | EPL to PDF: free online converter | EPL to ZPL: free online converter | EPL to DPL: API | EPL to EPL: API | EPL to IPL: API | EPL to SBPL: API | EPL to TSPL: API |
| IPL | IPL to XML: API | IPL to JSON: API, paid plans only | IPL to Images: free online converter | IPL to PDF: free online converter | IPL to ZPL: free online converter | IPL to DPL: API | IPL to EPL: API | IPL to IPL: API | IPL to SBPL: API | IPL to TSPL: API |
| SBPL | SBPL to XML: API | SBPL to JSON: API, paid plans only | SBPL to Images: free online converter | SBPL to PDF: free online converter | SBPL to ZPL: free online converter | SBPL to DPL: API | SBPL to EPL: API | SBPL to IPL: API | SBPL to SBPL: API | SBPL to TSPL: API |
| TSPL | TSPL to XML: API | TSPL to JSON: API, paid plans only | TSPL to Images: free online converter | TSPL to PDF: free online converter | TSPL to ZPL: free online converter | TSPL to DPL: API | TSPL to EPL: API | TSPL to IPL: API | TSPL to SBPL: API | TSPL to TSPL: API |
JSON export, and any conversion between two image or PDF formats, needs a paid plan. Every other combination — same-format round trips included — works on every plan.
Ready for your production shipping lane.
When a mis-rendered label stops a conveyor or fails a carrier audit, "close enough" isn't. LabelZoom is built and operated for workflows where labels are mission-critical.
Decode-verified barcode accuracy
A barcode that scans but carries the wrong payload is worse than an error. Our rendering engine's barcode output is verified by decoding the rendered symbols back — the same check a scan tunnel performs — not by eyeballing pixels.
Uptime SLAs up to 99.99%
Pro plans carry a 99.9% SLA, Business 99.95%, and Enterprise 99.99% — backed by geographic redundancy and latency-based routing across regions. Check current status any time at status.labelzoom.com.
Data retention you can put in a DPA
Shipping labels carry customer addresses. On Pro plans and above, label payloads are not retained after conversion; Enterprise plans support custom retention and data-residency requirements. Data processing agreements are available for enterprise customers.
A real company behind the API
LabelZoom is operated by RJF Technology Solutions LLC with a staffed support desk, invoicing for procurement, dedicated account management on Enterprise, and a stable release train — not an anonymous side project.
Simple, predictable pricing
Full access to conversion tools and the core engine. Choose the tools your logistics operation needs to scale.
Free
Basic
Pro
Business
API & Web App Feature Comparison
A detailed breakdown of what's included in each API subscription plan.
| Feature | Free | Basic | Pro | Business | Enterprise |
|---|---|---|---|---|---|
| Conversions per month | Unlimited (Watermarked) | 1,000 | 10,000 | 1,000,000 | Unlimited |
| API Access | Basic | Basic | Production | Production | Custom |
| Multi-page PDFs | |||||
| Self-service API Keys | |||||
| Large Files (>1 MB) | |||||
| Latency-based routing | |||||
| SLA | None | None | 99.9% | 99.95% | 99.99% |
| Data Retention | Standard | Standard | None | None | Custom |
| Release Train | Beta | Beta | Stable | Stable | Stable |
| Support | Community | Priority Email | Phone & Email | Dedicated Account Manager | |
| Data Residency |