People who never delete old photos aren't sentimental; they might be strengthening their autobiographical memory, say psychologists

Smartphones have made it easier than ever to capture everyday moments. Birthdays, holidays, random meals, old screenshots, blurry selfies and pictures that may not seem important at first often stay in people's galleries for years. While many regularly clear storage space by deleting old images, others rarely remove them.

According to psychologists, that habit does not always mean someone is overly emotional or simply attached to the past. In many cases, those photos may help people hold on to their personal memories and life story.

Photos can help people revisit personal experiences

Psychologists describe autobiographical memory as the memory of events people have personally experienced. These memories play a major role in how individuals understand their lives and identity.


A 2024 review published in Nature Reviews Psychology explains that autobiographical memories are not fixed records. Instead, they are reconstructed over time as people remember them. The review notes that external cues, including photographs and personal narratives, help people preserve meaningful life events and maintain a sense of continuity in their identity.

The paper also points out that emotional memories naturally change with time. Some details fade, while others are added or reshaped. Even so, people continue relying on these memories in everyday life, from getting to know someone to psychotherapy. The researchers highlight that narratives help people make sense of emotional experiences and draw meaning from them.

Keeping photos may strengthen memory retrieval

Research suggests that photographs do more than simply store moments. They often act as cues that make memories easier to retrieve.

A 2023 study published in Applied Cognitive Psychology compared smartphone photos that participants had saved with those they had deleted. Researchers found that events linked to saved photographs were remembered more vividly, with greater emotional intensity and more positively than events connected to deleted images.

The researchers also found that people usually keep photos taken as mementos, while images deleted later often served temporary purposes, such as storing information or documenting something briefly.

Rather than replacing memory, photographs appear to reactivate details that might otherwise remain difficult to recall.

Photos support memory, but they are not perfect records

The Nature Reviews Psychology review also stresses that autobiographical memories are malleable, meaning they naturally change over time. Photographs can provide relatively stable prompts during this reconstruction process, but they do not guarantee perfect accuracy. People may still remember events differently as years pass.

Because of this, psychologists sometimes describe photographs as a form of external memory support. They help trigger memories without acting as exact copies of the past.

Even edited photos can help people remember

Research published in the Journal of Applied Research in Memory and Cognition found that editing personal photographs generally did not harm memory for the original event. In some cases, cropping images actually strengthened memory for the remaining parts of the scene because it directed attention toward them.

The researchers also reported that reviewing photos improved recognition of the original experience, suggesting that looking back at meaningful images can reinforce memory over time.

The habit may be about memory, not nostalgia

Another line of research has shown that taking photos can sometimes reduce immediate memory for objects, a phenomenon known as the photo-taking impairment effect. However, psychologists say this does not mean photographs are harmful to memory in the long run. Reviewing and keeping meaningful images can still play an important role in helping people recall important experiences later.

Taken together, these findings suggest that someone who never deletes old photos may not simply be sentimental. Instead, they may be using those images as personal memory cues that help reconnect them with important experiences, emotions and the story of their own life.