diff --git a/src/services/deduplicationService.ts b/src/services/deduplicationService.ts
new file mode 100644
index 000000000..f2c42e76b
--- /dev/null
+++ b/src/services/deduplicationService.ts
@@ -0,0 +1,126 @@
+import { EnteFile } from 'types/file';
+import { getEndpoint } from 'utils/common/apiUtil';
+import { getToken } from 'utils/common/key';
+import { logError } from 'utils/sentry';
+import { getLocalFiles } from './fileService';
+import HTTPService from './HTTPService';
+
+const ENDPOINT = getEndpoint();
+
+interface DuplicatesResponse {
+    duplicates: Array<{
+        fileIDs: number[];
+        size: number;
+    }>;
+}
+
+interface DuplicateFiles {
+    files: EnteFile[];
+    size: number;
+}
+
+class DeduplicationService {
+    public async getDuplicateFiles() {
+        try {
+            const dupes = await this.fetchDuplicateFileIDs();
+            let ids: number[] = [];
+            for (const dupe of dupes) {
+                ids = ids.concat(dupe.fileIDs);
+            }
+
+            const localFiles = await getLocalFiles();
+            const fileMap = new Map<number, EnteFile>();
+            for (const file of localFiles) {
+                fileMap.set(file.id, file);
+            }
+
+            const result: DuplicateFiles[] = [];
+
+            const missingFileIDs: number[] = [];
+
+            for (const dupe of dupes) {
+                const files: EnteFile[] = [];
+                for (const fileID of dupe.fileIDs) {
+                    if (fileMap.has(fileID)) {
+                        files.push(fileMap.get(fileID));
+                    } else {
+                        missingFileIDs.push(fileID);
+                    }
+                }
+
+                if (files.length > 1) {
+                    result.push({
+                        files,
+                        size: dupe.size,
+                    });
+                }
+            }
+
+            return result;
+        } catch (e) {
+            logError(e, 'failed to get');
+        }
+    }
+
+    public async clubDuplicatesByTime(dupes: DuplicateFiles[]) {
+        const result: DuplicateFiles[] = [];
+        for (const dupe of dupes) {
+            let files: EnteFile[] = [];
+            const creationTimeCounter = new Map<number, number>();
+
+            let mostFreqCreationTime = 0;
+            let mostFreqCreationTimeCount = 0;
+            for (const file of dupe.files) {
+                const creationTime = file.metadata.creationTime;
+                if (creationTimeCounter.has(creationTime)) {
+                    creationTimeCounter.set(
+                        creationTime,
+                        creationTimeCounter.get(creationTime) + 1
+                    );
+                } else {
+                    creationTimeCounter.set(creationTime, 1);
+                }
+                if (
+                    creationTimeCounter.get(creationTime) >
+                    mostFreqCreationTimeCount
+                ) {
+                    mostFreqCreationTime = creationTime;
+                    mostFreqCreationTimeCount =
+                        creationTimeCounter.get(creationTime);
+                }
+
+                files.push(file);
+            }
+
+            files = files.filter((file) => {
+                return file.metadata.creationTime === mostFreqCreationTime;
+            });
+
+            if (files.length > 1) {
+                result.push({
+                    files,
+                    size: dupe.size,
+                });
+            }
+        }
+
+        return result;
+    }
+
+    private async fetchDuplicateFileIDs() {
+        try {
+            const response = await HTTPService.get(
+                `${ENDPOINT}/files/duplicates`,
+                null,
+                {
+                    'X-Auth-Token': getToken(),
+                }
+            );
+            return (response.data as DuplicatesResponse).duplicates;
+        } catch (e) {
+            logError(e, 'failed to get');
+        }
+    }
+}
+
+export default new DeduplicationService();