Free online X81 to XML converter

What the X81 format is

X81 has no generally recognized Internet file format. The established use of the .x81 extension is a ZX81 emulator snapshot, which stores machine memory and emulator state rather than web, metadata, or interchange data. Such a snapshot is binary and normally cannot be represented as meaningful XML without a format-specific decoder.

If your file came from a website, network application, or specialist program, verify its origin and internal format before converting it. File extensions alone do not identify a reliable data model.

What the XML format is

XML is a plain-text markup format for hierarchical data. Elements, attributes, namespaces, and character encoding make XML suitable for configuration files, data exchange, syndication, and long-term inspection by both people and software.

XML does not preserve arbitrary binary state automatically. A converter must know what each source byte means and map it to a defined XML schema; otherwise the result is only a byte dump wrapped in tags.

How to actually convert X81 to XML

1. Identify the producing software and confirm that the file is genuinely an X81 file. Do not rename the extension to .xml; renaming changes no data.
2. Open the file in the program that created it. Look for File → Export, File → Save As, or a data-export command offering XML.
3. If the application offers XML export, select it, choose UTF-8 when available, and save the result with an .xml extension.
4. Validate the exported file with the application's schema or an XML validator. Check that required elements, attributes, character encoding, and numeric values are present.
5. If you do not know the source format, inspect a copy with a hex viewer or identify it using file-signature tools. Do not upload confidential or executable data to an online converter.

You can also check whether the built-in converter on 101convert.com supports your particular X81 variant and XML output; the service can be used free without installing software. If X81 is not listed as a supported input, a generic conversion will not produce a trustworthy XML document.

Compatibility and limitations

There is no common X81-to-XML mapping or standard X81 XML schema. A successful export may preserve descriptive metadata while losing binary state, emulator-specific settings, memory layout, timing information, or unsupported extensions.

For a ZX81 snapshot, XML can describe selected metadata or decoded program content, but it cannot serve as a drop-in replacement for the original snapshot. Keep the original .x81 file alongside any XML export, and record the emulator, version, export settings, and character encoding used.