Validator · Coming Soon

XML Validator (XSD)

Validate your XML document against an XSD schema or check well-formedness — instantly in your browser with detailed error messages.

Get notified the day we launch. No spam, ever.

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What to expect

Built for developers

Validate XML against XSD schema or check basic XML well-formedness with clear, actionable error messages pointing to exact line numbers.

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Instant & in-browser

Runs client-side. Your data never leaves your browser.

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Zero ads

No ads, no trackers, no popups. Pure focus.

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File & paste support

Paste code or upload files. Both modes supported.

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Shareable links

Share output with teammates via a permanent link.

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Dark & light mode

Adapts to your system preference automatically.

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Mobile friendly

Fully responsive. Works on any screen size.

About this tool

OpenFormatter's XML Validator lets you validate XML online for free. Supports XSD (XML Schema Definition) validation, well-formedness checks, and namespace validation. Shows detailed error messages with line and column numbers. Handles complex XSD schemas including xs:include and xs:import. All processing happens in your browser — no data is sent to any server.

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