Use Apple's Duplicates collection for exact copies, then open similar groups in Gallery Dash. Compare focus, expression, framing and context, keep the best frame and review the rest.
1. Know what counts as a similar photo
Similar files may show the same subject seconds apart, the same document from another angle or the same scene with a slightly different crop. They can still contain distinct memories.
2. Search within a focused part of the library
Begin with an event, album or year where repeated shots are likely. A smaller scope lets you finish the comparison without mixing family memories, work images and screenshots.
3. Compare quality in the same order
Check sharpness first, then expression or motion, composition, exposure and unique context. For screenshots, replace expression with readability and whether the information is still current.
4. Keep the best, then review the rest
Choose the strongest frame before marking weaker ones. Archive uncertainty instead of forcing a choice, and inspect the complete delete batch once more outside the comparison group.
Common questions
Does iPhone group every similar photo automatically?
No. Photos detects exact duplicates and handles bursts, but not every near-identical group appears as a clean-up recommendation.
Is the largest file always the best photo?
No. File size reflects format, resolution and edit history, not necessarily better focus, expression or composition.
Should I keep edited and original versions?
Keep both when they serve different purposes. If the edit is final and reversible in Photos, an extra exported copy may be unnecessary.