Online Free Image Resizer Online UniConverter enables you to bulk resize images online free without losing quality. How to resize photos? Step 1. Click the Image Resizer extension icon on the top right corner of your Chrome browser. It will open an online free Image Resizer. Step 2. Select photo files from your local disk or drag & drop them to the page directly. Step 3. Change image size by pixels or by percentage. Step 4. Click on the RESIZE button to start resizing. Step 5. Click the DOWNLOAD or Save to Dropbox button to get the resized images.