Similar is not identical
Fictional example: Nina finds two photographs of her mother’s birthday. They look alike in the overview. Enlarging them reveals that one is cropped, removing a person at the edge. The original also has higher resolution. Nina keeps the original and the deliberately composed cropped version.
There is no need to call both a mistake merely because they show a similar scene. Separate identical copies, intentional edits and photographs taken moments apart. These groups need different decisions.
Establish the backup first
Create an independently preserved copy of important pictures before a substantial cleanup. A synchronised library on a second device may receive the same deletions and is not automatically a separate backup.
Actually open several files from the backup. Are they complete images, readable and the versions you wanted? When exporting, pay attention to the selected version and accompanying information. Small previews do not replace the full photographs. For irreplaceable family pictures, another independently stored backup is worthwhile.
Compare four characteristics
First look at the image itself: expressions, edges and small differences can matter. Then compare resolution and visible quality in an enlarged view. File size alone is not a dependable quality judgement because formats and compression differ.
Also compare edits and information such as capture date or description. A recently saved file is not necessarily the original. With motion photos or videos, a still-image copy may lose movement or sound. Preserve variants whose differences you deliberately want to use.
Apply automatic suggestions to small groups
Some photo applications detect duplicates and offer merging; Apple describes this feature for its Photos app. Before confirming, read what the particular tool does with originals and removed versions. Controls and retention of deleted items vary across services and versions.
Start, for example, with five clearly understood pairs. Check afterwards that the intended version remains and still works in your albums. Do not begin with an unchecked bulk deletion across the whole collection. A duplicate count cannot decide which versions have personal value to you.
Stop before uncertainty takes over
Leave unclear cases in place or mark them for later review. A few extra files are usually less troubling than a lost memory. Do not empty the trash merely to make the task feel finished; check the result and the service’s rules first.
Note the date and scope of the cleanup. If pictures subsequently appear to be missing, stop deleting and examine available recovery routes. This guide cannot guarantee rescue. For future imports, use a clear sequence: import once, verify the result and only then deliberately manage the source.
Your checklist
The checkboxes are for your own reference. No entries are sent to us. To keep a copy, print the page or save it as a PDF using your browser menu.
Common questions
Is the largest file always the best?
No. Format and compression affect size. Compare resolution, visible content and the use you have in mind.
Can I merge every similar burst photograph?
Similarity is not enough. Expressions, movement and framing may differ and may be worth keeping deliberately.
Why do not all duplicates appear immediately?
Detection may take time and depends on the tool. An empty or short suggestion list does not prove the whole collection is clean.
Sources and further information
Primary sources from public authorities, consumer organisations and providers. A source may be in another language; follow the guidance that applies to your service and where you live.
- Apple: Doppelte Fotos und Videos zusammenführenSource review date:
- Apple: Dubletten auf dem Mac prüfen und entfernenSource review date:
- Library of Congress: Persönliche Digitalfotos erhaltenSource review date:
- BACS: Lesbare unabhängige SicherungenSource review date:
