The term 'image joiner' describes a straightforward need: take multiple separate image files and produce one unified output. This need arises constantly in professional and personal workflows. A teacher needs to join four diagram screenshots into one worksheet image. A contractor joins before-and-after photos into one file for a client email. A marketer joins product mockups into one comparison image for a stakeholder presentation. A developer joins error screenshots into one bug report attachment. A content creator joins frame captures into one grid for social media. MergeFrame's image joiner addresses all of these scenarios with a single tool. The workflow is intentionally minimal: open the site, choose a grid layout that matches your image count, drag your files into the canvas, adjust spacing if desired, and export. The entire process takes under 30 seconds, even for first-time users. The joiner handles format mixing seamlessly — JPG, PNG, WebP, and even HEIC files can be joined in the same operation. Images of different resolutions are proportionally fitted to their cells without distortion. The output is always a lossless PNG, preserving every pixel of your source images at the exact resolution you specify. For users who join images regularly, the tool's consistency is a time-saver: same interface every time, same reliable output, same zero-privacy-risk processing. The optional Pro tier adds batch join capabilities and custom background colors for users who need advanced features, but the core image joining functionality is complete and unrestricted in the free version.