diff --git a/src/topics/thumbs.js b/src/topics/thumbs.js
index 484c84a0a0..ed81e04e89 100644
--- a/src/topics/thumbs.js
+++ b/src/topics/thumbs.js
@@ -3,27 +3,14 @@
 
 var nconf = require('nconf');
 var path = require('path');
-var fs = require('fs');
-var request = require('request');
-var mime = require('mime');
-var validator = require('validator');
-var util = require('util');
 
 const db = require('../database');
-var meta = require('../meta');
-var image = require('../image');
 var file = require('../file');
 var plugins = require('../plugins');
 
 const Thumbs = {};
 module.exports = Thumbs;
 
-const getHead = util.promisify(request.head);
-
-function pipeToFile(source, destination, callback) {
-	request(source).pipe(fs.createWriteStream(destination)).on('close', callback);
-}
-const pipeToFileAsync = util.promisify(pipeToFile);
 
 Thumbs.exists = async function (tid, path) {
 	// TODO: tests
@@ -80,66 +67,3 @@ Thumbs.delete = async function (tid, relativePath) {
 		await file.delete(absolutePath);
 	}
 };
-
-Thumbs.resizeAndUpload = async function (data) {
-	const allowedExtensions = file.allowedExtensions();
-
-	// Handle protocol-relative URLs
-	if (data.thumb && data.thumb.startsWith('//')) {
-		data.thumb = `${nconf.get('secure') ? 'https' : 'http'}:${data.thumb}`;
-	}
-
-	// Only continue if passed in thumbnail exists and is a URL. A system path means an upload is not necessary.
-	if (!data.thumb || !validator.isURL(data.thumb)) {
-		return;
-	}
-	var pathToUpload;
-	const res = await getHead(data.thumb);
-
-	try {
-		const type = res.headers['content-type'];
-		if (!type.match(/image./)) {
-			throw new Error('[[error:invalid-file]]');
-		}
-
-		var extension = path.extname(data.thumb);
-		if (!extension) {
-			extension = '.' + mime.getExtension(type);
-		}
-
-		if (!allowedExtensions.includes(extension)) {
-			throw new Error('[[error:invalid-file]]');
-		}
-
-		const filename = Date.now() + '-topic-thumb' + extension;
-		const folder = 'files';
-		pathToUpload = path.join(nconf.get('upload_path'), folder, filename);
-
-		await pipeToFileAsync(data.thumb, pathToUpload);
-
-		await image.isFileTypeAllowed(pathToUpload);
-
-		await image.checkDimensions(pathToUpload);
-		await image.resizeImage({
-			path: pathToUpload,
-			width: meta.config.topicThumbSize,
-			height: meta.config.topicThumbSize,
-		});
-
-		if (!plugins.hooks.hasListeners('filter:uploadImage')) {
-			data.thumb = '/assets/uploads/' + folder + '/' + filename;
-			return;
-		}
-
-		const uploadedFile = await plugins.hooks.fire('filter:uploadImage', {
-			image: { path: pathToUpload, name: '' },
-			uid: data.uid,
-			folder: folder,
-		});
-		file.delete(pathToUpload);
-		data.thumb = uploadedFile.url;
-	} catch (err) {
-		file.delete(pathToUpload);
-		throw err;
-	}
-};