We haven’t had many reasons to use Google’s reverse image search, but some people find it invaluable. Put simply, you can search using an image you already have instead of entering a text search term. You get visually similar images as a result, the same image in different sizes, and websites that feature the image or those similar to the one you’ve searched with.

For some reason, Google doesn’t allow you to upload an image if you’re using a phone, even if you’re using the Chrome browser. All you can do in Chrome for iOS or Android is to long-press on an image you’ve found in the search results and use that to find similar images:

How to do a reverse Google Image search

Fortunately, someone has created a web app that gets around this limitation.

How to do a reverse Google Image search on Android or iPhone

To use the web app, head to ctrlq.org/google/images/ and tap on the Select Image button. You should then see options to take a photo using the camera – potentially useful for landmarks or buildings – or choose an image from your camera roll or documents.

In the main, you’ll probably use the latter: a photo already stored on your phone. Once you select it, the photo will be uploaded and appear as a thumbnail below the Select Image button.

Simply tap the Reverse Search button to run the reverse Google image search, just as you can on a PC or laptop.

How to do a reverse Google Image search on a laptop or PC

When you need to search using an image on your PC, just head to images.google.com in a browser and click the camera icon which is usually on the right-hand side of the search box. You can then choose an image from your hard drive.

You can also drag an image onto the search box (when on the Images tab of Google) to quickly upload a photo to use for a search.

How to do a reverse Google Image search

Another handy tip is that you right-click on any image on any website in Google Chrome and choose the Search Google for image.