A free Mirth Connect alternative for HL7 → FHIR conversion
Mirth Connect went commercial under NextGen. For the everyday job of turning an HL7 v2 message into a FHIR R4 bundle, you don’t need a license or a server — you need a converter that runs in your browser and doesn’t make you upload PHI. Here’s an honest one.
Need to convert HL7 v2 to FHIR without standing up Mirth Connect (now commercially licensed under NextGen)? This is a free, 100% in-browser HL7→FHIR R4 converter — no install, no server, no license. Paste a message, get a bundle. For the conversion step specifically, it’s the fastest path; for full interface routing/transport you still need an engine.
Why people look for a Mirth alternative
- Licensing changed. Mirth Connect moved to a commercial, NextGen-licensed distribution; teams want an open, no-cost option for the everyday conversion work.
- Overkill for a quick conversion. Spinning up a channel to see what an HL7 message looks like as FHIR is heavy. Pasting it into a browser is instant.
- PHI can’t leave the building. Most online converters are server-side — you legally can’t paste real patient data. This one runs entirely in your browser; nothing is uploaded.
What this tool replaces — and what it doesn’t
| Job | This tool | Still need an engine? |
|---|---|---|
| HL7 v2 → FHIR R4 conversion | Yes — free, instant, in-browser | No |
| See what a message maps to / debug a mapping | Yes — with a “needs review” panel | No |
| MLLP/TCP transport, ACKs, channels, routing | No | Yes — that’s an interface engine’s job |
| Scheduling, retries, monitoring, audit | No | Yes |
In other words: it replaces the part of Mirth you’d hand-write a transformer for, not the message bus.
Try it
Load a sample or paste your own — it converts as you type, and nothing leaves your browser.
Zkeleton builds conversion and data infrastructure for healthcare. This converter is free, runs entirely in your browser, and never sends a message anywhere — we keep it open because clean data plumbing should be a commodity, not a toll.