Showing image previews before upload significantly improves user experience by letting users verify their selection instantly. As the creator of CoreUI with over 11 years of React development experience since 2014, I’ve implemented image preview functionality in countless profile editors and galleries. The most effective solution is to use URL.createObjectURL() to create a temporary URL for the selected file. This approach is fast, efficient, and works seamlessly without reading the entire file into memory.

Showing image previews before upload greatly improves user experience by letting users verify their selection before submitting. As the creator of CoreUI with over 11 years of Vue development experience since 2014, I’ve built this feature into numerous profile editors and content management systems. The most effective solution is to use the FileReader API to read the selected file and create a data URL for display. This approach works entirely in the browser without requiring a server roundtrip.