ECHA never shipped a standalone IUCLID 5 → 6 file converter, so legacy .i5z and
.i5a files are easy to get stuck with. We close that gap.
How it works
We run the real software, end to end, so the conversion is faithful:
- Your IUCLID 5 file is read and validated with the genuine IUCLID 5 engine.
- A headless IUCLID 6 imports it — ECHA’s own 5→6 structure mapping
auto-migrates the data — and exports a valid
.i6z. - You get the converted file back, with a short QA summary.
No GUI, no manual re-keying, and batch conversion for whole archives.
Why use it
- Free — a no-obligation service for prospective and existing customers.
- Faithful — substance, dossier and document data is preserved; the 5→6 mapping is ECHA’s own, not a third-party guess.
- EU-hosted, GDPR-compliant — files are processed in the EU and deleted after conversion; see our Trust Center.
- A natural first step — once on IUCLID 6, you can migrate to managed cloud hosting with us.
- Registering in Türkiye under KKDİK? The Turkish KKS is aligned to IUCLID 6, so legacy IUCLID 5 files must be converted first. Details: IUCLID 5 to 6 conversion for KKDİK, also in Turkish.
Got a folder of old IUCLID 5 dossiers? Send a sample to migration [at] 4chems.com and we’ll convert it.
Oliver helps regulatory and IT teams move IUCLID, CHESAR and the QSAR Toolbox to secure, managed cloud hosting.
See your own tool stack running in the EU cloud — in a 30-minute walkthrough.
Book a slot and we reply within one business day. You get a live walkthrough of IUCLID, CHESAR, QSAR Toolbox and the AI assistants on a dedicated environment, and a straight recommendation at the end.