Non-invasive programmable thermal label middleware. Convert, transform, and intercept print streams downstream without touching legacy ERP, WMS, or AS400 code. Devs integrate once. Business controls the flow.
Client Systems
WMS / ERP / TMS
ZplFlow.io
Label Output
Zebra · SATO · TEC
Inbound print streams from AS400, SAP, or WMS
Focus your IT on what matters most.
Every production line runs on labels. Every label starts as data, a PDF, a shipping manifest, an order. But somewhere between that data and the thermal printer, the process breaks. And every fix becomes an IT project lasting days or weeks.
Sign up in 30 seconds. No credit card required.
One click in the dashboard. Your key is ready.
Send a PDF, get ZPL. Or the other way around. Under 200ms.
ZplFlow is an API-first label conversion infrastructure, the Universal Label Bridge between PDF documents and ZPL (Zebra Programming Language) thermal printer commands. It provides bidirectional PDF to ZPL and ZPL to PDF conversion via a REST API and native CLI, purpose-built for high-throughput WMS, ERP, and TMS systems.
Every production line, warehouse, and distribution center runs on labels. But somewhere between the PDF generated by your ERP and the ZPL expected by your Zebra printer, the process breaks. ZplFlow bridges that gap with a single API call, no desktop software, no fixed licenses, no IT projects.
Beyond conversion, ZplFlow offers a programmable ZPL pipeline engine with 24 transformers: add barcodes, QR codes, Data Matrix, GS1-128 compliance, rotate, scale, crop, mirror labels, and apply conditional logic, all without touching your WMS. Labels adapt to carriers, clients, and regulations in real time.
ZplFlow is the first label platform with an MCP (Model Context Protocol) server, enabling AI agents like Claude and GPT to interact with label infrastructure using natural language. It is stateless by design, EU-hosted, GDPR-compliant, and uses AES-256 encryption at rest. Sync conversions complete in under 200ms. Async batch processing handles 10,000+ labels per hour.
Trusted by enterprise teams, ZplFlow is bootstrapped, open-source, and built by engineers with 20 years of software experience and 10 in logistics IT. Start with 6,000 free tokens, no credit card required.
REST API or native CLI. 3 lines or 1 command. That's it.
DocumentationI have PDFs from carriers but the printer wants ZPL. Or vice versa. I have to manage two systems.
Bidirectional PDF ↔ ZPL conversion in a single API.
One integration. Zero separate systems.
The line stops if I get a label wrong. Or if volumes exceed forecast.
Dynamic over-budget keeps printing even when volumes spike. Every operation is verified, no label is ever lost or double-charged.
The line never stops. Even during peaks.
On-premise software costs thousands of euros per year. And I have to maintain the servers.
Cloud-native, stateless, pay-per-use. No installation, no fixed licenses.
Pay only for what you use. Predictable costs. From €0 the first month.
Every warehouse runs on labels. Every label starts as data, a PDF, a shipping manifest, an order. But somewhere between that data and the thermal printer, the process breaks.
We built ZplFlow because the world doesn't need another label editor. It needs label infrastructure, an API that turns PDFs into ZPL, ZPL into PDFs, and both into pipelines that transform, validate, and optimize every label that touches a box.
Cloud-native. Stateless. AI-ready. Five minutes to first label. That's ZplFlow.
We didn't start from a pitch deck. We started from years of customer requests, the same label modifications asked over and over, by different teams, in different warehouses. 20 years building software, 10 of them in logistics IT, taught us the problem was never the printer or the label. It was the lack of infrastructure. ZplFlow is bootstrapped, we built it to solve the problem, not to raise money for it.
Built in the open
Every statement below maps to a real file in our codebase. If it's not documented, we don't say it.
Early access
1416 engineers on the early-access list
We grow this number only when it's real. Launching September 29, 2026, request early access to be counted.
Get 6,000 free tokens. No credit card required. API access in 5 minutes.
