# xmlvalid vs Liquid Technologies' online validators

Source: https://xmlvalid.com/compare/liquid-technologies

> Liquid Technologies, the makers of Liquid Studio, offer free online validators for XSD, RelaxNG and Schematron. They are a quick check for a small document and a single schema file; xmlvalid is built for large files, schemas spread over many files, e-invoices and automation.

Last updated · 19 October 2026

## At a glance

| What | xmlvalid | Liquid Technologies |
|---|---|---|
| Price | Free in the browser. API: 100 validations a month free, Pro from $29 a month | Free online; Liquid Studio for the desktop has a free Community Edition and paid editions |
| Where the check runs | In your browser (WebAssembly): the file is not uploaded. The API and URL monitors run on our servers | On Liquid's servers: "all data is stored on our servers for processing and may be retained for service improvement" |
| Document size | Up to 1 GB (50 MB without an account); API up to 1 GB on Pro | Up to 512 KB online; unlimited in the desktop editions |
| Schema files | Many: an XSD or RelaxNG set with its includes and imports, chosen together or as a folder | One schema file online |
| Schema languages | XSD 1.0, DTD, RelaxNG (XML and compact syntax), Schematron | XSD, RelaxNG and Schematron; well-formedness on its own page |
| Input | Paste, file, URL, a folder or .zip of up to 1,000 documents; Factur-X and ZUGFeRD PDFs | Pasted into a form |
| E-invoices | 71 profiles with their official schemas and business rules, for 21 countries with a page each | Not offered |
| Findings | Line and column, the rule id, the XPath where a rule fired, and a page for every rule and for 90 common error messages | Severity, location and message |
| API and CI | REST API with OpenAPI, command-line client, GitHub Action, SDKs for PHP (with Laravel and Symfony packages), Python and TypeScript, an MCP server for AI agents, n8n, Apify and a Postman collection | Not offered for the online validators |

## Where xmlvalid fits better

- Large documents: up to 1 GB, streamed, where the online validators stop at 512 KB.
- Real schema sets: an XSD that includes or imports others works as uploaded, and so do the 166 schemas of [the catalog](https://xmlvalid.com/schemas).
- Privacy: the document is validated in your browser and not uploaded, so there is nothing to retain.
- E-invoices with their business rules (Peppol, XRechnung, Factur-X and more), and an API, a GitHub Action and SDKs for the same checks in CI.
- Error messages explained: [what each common message means](https://xmlvalid.com/errors) and how to fix it.

## Where Liquid Technologies fits better

- Designing schemas: Liquid Studio is a desktop IDE with a graphical XSD editor, and its data binder writes code from a schema. xmlvalid validates and does not edit schemas.
- Everything offline on your desktop, including the free Community Edition.

## Questions

### Is my document kept?

Liquid's online validators say that data is stored on their servers and may be retained. xmlvalid validates in your browser, so the document never reaches our servers; only the API and URL monitors validate there, and they delete the document when the check finishes.

### My schema includes other files. Can I validate against it?

Yes, in xmlvalid: choose all the files of the set (or their folder) and mark the main one; includes and imports resolve between them. Liquid's online validators take one schema file.

### Can xmlvalid write an XSD from a sample?

Yes, with the free [XSD generator](https://xmlvalid.com/tools/xsd-generator), which also checks the samples against the result. The [XML from XSD](https://xmlvalid.com/tools/xsd-to-xml) tool goes the other way.

## How we compared

What the table says about Liquid Technologies comes from its own public pages, as they read on 19 October 2026; "Not stated" means we found no answer there. Products change: if something here is out of date, [tell us](https://xmlvalid.com/contacts) and we will correct it.

- [Liquid Technologies: Free Online XML Validator (XSD)](https://www.liquid-technologies.com/online-xsd-validator)
- [Liquid Technologies: Free Online XML Validator (RelaxNG)](https://www.liquid-technologies.com/online-relaxng-validator)
- [Liquid Technologies: Free Online XML Validator (Schematron)](https://www.liquid-technologies.com/online-schematron-validator)
- [Liquid Studio editions](https://www.liquid-technologies.com/xml-studio-editions)

### Other comparisons

- [xmlvalid vs the ecosio validator](https://xmlvalid.com/compare/ecosio)
- [xmlvalid vs the EU Interoperability Test Bed validator](https://xmlvalid.com/compare/eu-itb)