Peppol Validator vs ecosio
Two free Peppol validators, side by side, with the comparison set to features that can be verified from each tool's public pages. Both are good. They are not identical.
By Peppol Validator · Last updated
Short version
For a one-shot manual validation of a UBL or CII invoice, both tools do the job and the choice is mostly preference. If you need a public API or an agent interface that you can call from your own code with no sales conversation, Peppol Validator is the easier path: the REST API is documented at /developers and the agent interface lives at /ai-agents. ecosio is a strong, established commercial e-invoicing vendor and their free validator is widely used in the European Peppol community.
Feature comparison
Every row in this table is sourced from the two tools' own public product pages. Where ecosio does not state something on the free product page, the cell says so explicitly. Nothing about ecosio's commercial product, customers, internals or pricing is included, because none of that is verifiable from public pages.
| Feature | Peppol Validator | ecosio (free validator) |
|---|---|---|
| Free to use | Yes | Yes |
| Signup required | No | No |
| Web upload (drag-and-drop XML in the browser) | Yes | Yes |
| EN 16931 (CEN) schematron | Yes | Yes |
| Peppol BIS Billing 3.0 | Yes | Yes |
| UBL 2.1 invoice & credit note | Yes | Yes |
| CII (Cross Industry Invoice) | Yes | Yes |
| Factur-X / ZUGFeRD CII payload | Yes | Yes |
| XRechnung CIUS | Yes | Yes |
| Country-specific CIUS profiles | Peppol BIS country profiles via the same engine | Multiple country-specific CIUS formats per ecosio |
| Auto-detects UBL vs CII | Yes | Yes |
| Public REST API | Yes (documented at /developers, free, no signup) | Available (contact ecosio for details) |
| AI agent / MCP interface | Yes (/ai-agents) | Not stated on the public product page |
| Open per-rule reference pages | Yes (every EN 16931 and Peppol BIS rule has its own URL) | Not stated on the public product page |
- Public REST API: ecosio mentions a RESTful web service on their product page; the public access path is not on the free product page.
Where each one shines
Peppol Validator
- Documented public REST API, free, no signup. Suitable for CI pipelines, ERP integration tests, automation jobs.
- Agent / MCP interface for LLMs and tool-using AI assistants.
- Per-rule reference pages: every EN 16931 (BR-) and Peppol BIS (PEPPOL-EN16931-) rule has its own indexable URL with explanation, fix and links to the affected business terms.
- Reference pages for the wider Peppol ecosystem (network, mandates by country, business terms, diagrams) so the validator is part of a broader knowledge base.
ecosio (free validator)
- Free, no signup, runs in the browser. Same on-ramp as the Peppol Validator.
- Multiple country-specific CIUS rule sets selectable from a dropdown, per ecosio's product page.
- Backed by a long-established commercial e-invoicing and EDI vendor with a paid platform you can grow into if your needs go beyond a free validation tool.
What this comparison does not cover
We deliberately leave several things out of the table because we cannot verify them from public pages. Specifically: file-size limits, rate limits, specific schematron versions, response time guarantees, uptime, anything about ecosio's paid commercial platform, and anything about either vendor's customers. If a column is not in the table, it is not because we do not know our own answer; it is because we cannot honestly fill in ecosio's side without access to non-public information.
If you are evaluating either tool for production use, the right next step is to run an actual invoice through both and compare the output, not to rely on a marketing page from either side.
Try Peppol Validator
Drop a UBL or CII XML invoice and see the merged EN 16931 + Peppol BIS validation output, rule by rule. Free, instant, no signup.
Frequently asked questions
Are both validators really free?
Yes. Peppol Validator (peppolvalidator.com) is free and requires no signup. ecosio's free Peppol/e-invoice/XML validator is also free and, per their public product page, requires no registration. Both run in the browser as upload-and-check tools.
Which standards do they cover?
Both validators check documents against EN 16931 (the European e-invoicing standard) and Peppol BIS Billing 3.0. Both support UBL 2.1 and CII (the two official EN 16931 syntaxes). Both can validate XRechnung as a national CIUS, and both can check the CII payload that lives inside Factur-X / ZUGFeRD PDFs. Country-specific CIUS coverage and the way each tool surfaces results differ in detail.
Is there an API?
Peppol Validator has a public REST API documented at /developers. It is free, requires no signup and returns the same EN 16931 + Peppol BIS validation results as the web tool. ecosio's product page mentions that their validator is also available as a RESTful web service; the access path is not surfaced on the public free product page, so the practical answer is 'available (contact ecosio for details)'.
Which one should I use?
If you want a one-shot manual check of an invoice file, both tools work and there is no wrong choice. Try both and see which UI you prefer. If you need a documented public API to call from your CI pipeline, your ERP integration, or an AI agent, Peppol Validator is currently the path of least resistance because the API and agent interface are public, free and self-serve. If you want a tool from a vendor with a long commercial track record in EDI and e-invoicing, ecosio is a strong choice.
Based on publicly available information from ecosio.com as of April 2026. ecosio is a trademark of its respective owner. We have no affiliation with ecosio. If anything on this page is inaccurate or out of date, please let us know and we will correct it.