diff --git a/src/core/operations/Diff.mjs b/src/core/operations/Diff.mjs
deleted file mode 100644
index 7adea178..00000000
--- a/src/core/operations/Diff.mjs
+++ /dev/null
@@ -1,129 +0,0 @@
-/**
- * @author n1474335 [n1474335@gmail.com]
- * @copyright Crown Copyright 2016
- * @license Apache-2.0
- */
-
-import Operation from "../Operation.mjs";
-import Utils from "../Utils.mjs";
-import * as JsDiff from "diff";
-import OperationError from "../errors/OperationError.mjs";
-
-/**
- * Diff operation
- */
-class Diff extends Operation {
-
-    /**
-     * Diff constructor
-     */
-    constructor() {
-        super();
-
-        this.name = "Diff";
-        this.module = "Diff";
-        this.description = "Compares two inputs (separated by the specified delimiter) and highlights the differences between them.";
-        this.infoURL = "https://wikipedia.org/wiki/File_comparison";
-        this.inputType = "string";
-        this.outputType = "html";
-        this.args = [
-            {
-                "name": "Sample delimiter",
-                "type": "binaryString",
-                "value": "\\n\\n"
-            },
-            {
-                "name": "Diff by",
-                "type": "option",
-                "value": ["Character", "Word", "Line", "Sentence", "CSS", "JSON"]
-            },
-            {
-                "name": "Show added",
-                "type": "boolean",
-                "value": true
-            },
-            {
-                "name": "Show removed",
-                "type": "boolean",
-                "value": true
-            },
-            {
-                "name": "Ignore whitespace",
-                "type": "boolean",
-                "value": false,
-                "hint": "Relevant for word and line"
-            }
-        ];
-    }
-
-    /**
-     * @param {string} input
-     * @param {Object[]} args
-     * @returns {html}
-     */
-    run(input, args) {
-        const [
-                sampleDelim,
-                diffBy,
-                showAdded,
-                showRemoved,
-                ignoreWhitespace
-            ] = args,
-            samples = input.split(sampleDelim);
-        let output = "",
-            diff;
-
-        // Node and Webpack load modules slightly differently
-        const jsdiff = JsDiff.default ? JsDiff.default : JsDiff;
-
-        if (!samples || samples.length !== 2) {
-            throw new OperationError("Incorrect number of samples, perhaps you need to modify the sample delimiter or add more samples?");
-        }
-
-        switch (diffBy) {
-            case "Character":
-                diff = jsdiff.diffChars(samples[0], samples[1]);
-                break;
-            case "Word":
-                if (ignoreWhitespace) {
-                    diff = jsdiff.diffWords(samples[0], samples[1]);
-                } else {
-                    diff = jsdiff.diffWordsWithSpace(samples[0], samples[1]);
-                }
-                break;
-            case "Line":
-                if (ignoreWhitespace) {
-                    diff = jsdiff.diffTrimmedLines(samples[0], samples[1]);
-                } else {
-                    diff = jsdiff.diffLines(samples[0], samples[1]);
-                }
-                break;
-            case "Sentence":
-                diff = jsdiff.diffSentences(samples[0], samples[1]);
-                break;
-            case "CSS":
-                diff = jsdiff.diffCss(samples[0], samples[1]);
-                break;
-            case "JSON":
-                diff = jsdiff.diffJson(samples[0], samples[1]);
-                break;
-            default:
-                throw new OperationError("Invalid 'Diff by' option.");
-        }
-
-        for (let i = 0; i < diff.length; i++) {
-            if (diff[i].added) {
-                if (showAdded) output += "<span class='hl5'>" + Utils.escapeHtml(diff[i].value) + "</span>";
-            } else if (diff[i].removed) {
-                if (showRemoved) output += "<span class='hl3'>" + Utils.escapeHtml(diff[i].value) + "</span>";
-            } else {
-                output += Utils.escapeHtml(diff[i].value);
-            }
-        }
-
-        return output;
-    }
-
-}
-
-export default Diff;