Use an HTML table with two cells
Use CSS flexbox with two image elements
Use CSS grid with two columns
Place both images in a single row container
Set each image to display inline-block
Use a photo editor or collage app
Use Microsoft Word or Google Docs in a two-column layout
Use PowerPoint or Keynote to position images side by side
Use Canva or similar design tools
Use an image editing program to combine them into one canvas