5 Free Tools Every Chrome Extension Developer Needs in 2026

Building a Chrome extension is the easy part. Getting people to actually install it? That's where most of us get stuck. Here are 5 free tools I honestly wish I had when I started. 1. Screenshot Makeup This tool transforms basic screenshots into professional looking Chrome Web Store listings. You can add device frames like MacBook, Chrome browser, and iPhone. There are around 50 gradient backgrounds to pick from, plus text overlays. Everything exports at the exact Chrome Web Store sizes. Try it here: extensionbooster.com/tools/screenshot-makeup 2. Icons Generator Chrome requires 4 icon sizes: 16, 32, 48, and 128 pixels. Instead of manually resizing in Figma or Photoshop, just upload one image and get all 4 sizes in one click. Try it here: extensionbooster.com/tools/extension-icons-generator 3. MV2 to MV3 Converter Manifest V2 is being deprecated and the migration is genuinely painful. This tool lets you paste your MV2 JSON and get the MV3 output with migration notes explaining each chan