XML Merge Tool [2025]

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Combine two XML documents using automatic appending or precise key-based merging.

✓ Merge Two XML Inputs✓ Automatic Append Strategy✓ Key-Based Merging (Attribute/Element)✓ Formatted Output

XML Input 1 (Base)

XML Input 2 (Merge In)

Merged XML Output

How It Works

  1. Input XML: Paste your first XML document into "XML Input 1 (Base)" and the second document into "XML Input 2 (Merge In)". You can also load the provided examples.
  2. Choose Strategy: Select a merge strategy from the options:
    • Automatic (Append): If root elements match, children from Input 2 are appended to Input 1's root. If roots differ, Input 2's root is appended under Input 1's root.
    • Key-Based (Replace): Specify a unique identifier (either an attribute name like `id` or a child element tag name like `uniqueID`). Elements under the root in Input 2 will replace elements in Input 1 if their keys match. Elements from Input 2 without a match (or without a key) are appended. Root elements must have the same name for this strategy.
  3. Specify Key (If Key-Based): If using the Key-Based strategy, enter the name of the attribute OR the child element tag name that acts as the unique key. Only provide one (attribute or element).
  4. Format Option: Toggle "Format Output" to get a pretty-printed, indented XML result.
  5. Merge: Click the "Merge XML" button.
  6. Review Output: The merged XML result will appear in the "Merged XML Output" area. Copy it for your use.

Features & Strategies

Merging Capabilities

  • ✓ Merges two distinct XML inputs.
  • ✓ Handles basic XML structures and attributes.
  • ✓ Client-side processing for speed and privacy.
  • ✓ Option for formatted, readable output.

Merge Strategies

  • ✓ Automatic: Simple appending logic, useful for combining lists under the same root.
  • ✓ Key-Based: Allows updating/adding elements based on a unique identifier (attribute or child element). Uses replacement logic for matches.
  • ✓ Specify key type (attribute name or element tag name).

Frequently Asked Questions

What does 'Key-Based (Replace)' mean?

When using the key-based strategy, the tool looks for elements under the root in both inputs that share the same key value (based on the attribute or element you specify). If a match is found, the entire element from "XML Input 2" replaces the corresponding element in "XML Input 1". If an element in Input 2 has no matching key in Input 1, it's added to the end.

Can I merge based on nested keys?

Currently, the key-based merging works on direct children of the root element. It uses either an attribute of the child element or the text content of a *direct* child element of that child. It does not support deeply nested keys or complex XPath expressions for matching.

What happens if the XML is invalid?

The tool uses the browser's built-in XML parser. If either input contains syntax errors (is not well-formed), the merge operation will fail, and an error message will be displayed indicating which input is invalid.

Is there a file size limit?

Since the merging happens in your browser, performance depends on your computer's resources and the complexity/size of the XML documents. Very large files (many megabytes) might cause the browser to become slow or unresponsive. There's no explicit server-side limit.

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