diff --git a/src/app/features/files/pages/file-detail/file-detail.component.spec.ts b/src/app/features/files/pages/file-detail/file-detail.component.spec.ts
index 6cb497816..42e09b7d9 100644
--- a/src/app/features/files/pages/file-detail/file-detail.component.spec.ts
+++ b/src/app/features/files/pages/file-detail/file-detail.component.spec.ts
@@ -169,11 +169,14 @@ describe('FileDetailComponent', () => {
     setup();
     (store.dispatch as Mock).mockClear();
     const openSpy = vi.spyOn(window, 'open').mockReturnValue({ focus: vi.fn() } as unknown as Window);
+    const timeZone = Intl.DateTimeFormat().resolvedOptions().timeZone;
 
     component.downloadRevision('3');
 
     expect(dataciteService.logIdentifiableDownload).toHaveBeenCalledWith(component.fileMetadata$);
-    expect(openSpy).toHaveBeenCalledWith('https://osf.test/download/?revision=3');
+    expect(openSpy).toHaveBeenCalledWith(
+      `https://osf.test/download/?revision=3&source=file-detail&tz=${encodeURIComponent(timeZone)}`
+    );
     expect(store.dispatch).toHaveBeenCalledWith(new GetFileRevisions('https://osf.test/upload'));
   });
 
@@ -223,11 +226,14 @@ describe('FileDetailComponent', () => {
     setup();
     (store.dispatch as Mock).mockClear();
     const openSpy = vi.spyOn(window, 'open').mockReturnValue({ focus: vi.fn() } as unknown as Window);
+    const timeZone = Intl.DateTimeFormat().resolvedOptions().timeZone;
 
     component.downloadFile();
 
     expect(dataciteService.logIdentifiableDownload).toHaveBeenCalledWith(component.fileMetadata$);
-    expect(openSpy).toHaveBeenCalledWith('https://osf.test/download');
+    expect(openSpy).toHaveBeenCalledWith(
+      `https://osf.test/download?source=file-detail&tz=${encodeURIComponent(timeZone)}`
+    );
     openSpy.mockRestore();
   });
 
diff --git a/src/app/features/files/pages/file-detail/file-detail.component.ts b/src/app/features/files/pages/file-detail/file-detail.component.ts
index 4e1591d22..5030355ae 100644
--- a/src/app/features/files/pages/file-detail/file-detail.component.ts
+++ b/src/app/features/files/pages/file-detail/file-detail.component.ts
@@ -40,6 +40,7 @@ import { MetadataTabsComponent } from '@osf/shared/components/metadata-tabs/meta
 import { SubHeaderComponent } from '@osf/shared/components/sub-header/sub-header.component';
 import { MetadataResourceEnum } from '@osf/shared/enums/metadata-resource.enum';
 import { ResourceType } from '@osf/shared/enums/resource-type.enum';
+import { appendDownloadTrackingParams } from '@osf/shared/helpers/download-link.helper';
 import { getMfrUrlWithVersion } from '@osf/shared/helpers/mfr-url.helper';
 import { CustomConfirmationService } from '@osf/shared/services/custom-confirmation.service';
 import { DataciteService } from '@osf/shared/services/datacite/datacite.service';
@@ -250,7 +251,8 @@ export class FileDetailComponent implements OnDestroy {
     const storageLink = this.file()?.links.upload || '';
 
     if (downloadUrl) {
-      window.open(`${downloadUrl}/?revision=${version}`)?.focus();
+      const link = appendDownloadTrackingParams(`${downloadUrl}/?revision=${version}`, 'file-detail');
+      window.open(link)?.focus();
       this.actions.getFileRevisions(storageLink);
     }
   }
@@ -266,7 +268,7 @@ export class FileDetailComponent implements OnDestroy {
       .logIdentifiableDownload(this.fileMetadata$)
       .pipe(takeUntilDestroyed(this.destroyRef))
       .subscribe();
-    window.open(link)?.focus();
+    window.open(appendDownloadTrackingParams(link, 'file-detail'))?.focus();
   }
 
   deleteEntry(link: string): void {
diff --git a/src/app/features/preprints/components/preprint-details/share-and-download/share-and-download.component.spec.ts b/src/app/features/preprints/components/preprint-details/share-and-download/share-and-download.component.spec.ts
index 13f353715..011056ab2 100644
--- a/src/app/features/preprints/components/preprint-details/share-and-download/share-and-download.component.spec.ts
+++ b/src/app/features/preprints/components/preprint-details/share-and-download/share-and-download.component.spec.ts
@@ -85,7 +85,7 @@ describe('ShareAndDownloadComponent', () => {
 
     component.download();
 
-    expect(socialShareService.createDownloadUrl).toHaveBeenCalledWith(mockPreprint.id);
+    expect(socialShareService.createDownloadUrl).toHaveBeenCalledWith(mockPreprint.id, 'preprint');
     expect(openSpy).toHaveBeenCalledWith('https://example.com/download');
     expect(focus).toHaveBeenCalled();
     expect(dataciteService.logIdentifiableDownload).toHaveBeenCalledWith(component.preprint$);
@@ -124,7 +124,7 @@ describe('ShareAndDownloadComponent', () => {
 
     component.download();
 
-    expect(socialShareService.createDownloadUrl).toHaveBeenCalledWith(mockPreprint.id);
+    expect(socialShareService.createDownloadUrl).toHaveBeenCalledWith(mockPreprint.id, 'preprint');
     expect(dataciteService.logIdentifiableDownload).not.toHaveBeenCalled();
     openSpy.mockRestore();
   });
diff --git a/src/app/features/preprints/components/preprint-details/share-and-download/share-and-download.component.ts b/src/app/features/preprints/components/preprint-details/share-and-download/share-and-download.component.ts
index 896c48f40..bc504b085 100644
--- a/src/app/features/preprints/components/preprint-details/share-and-download/share-and-download.component.ts
+++ b/src/app/features/preprints/components/preprint-details/share-and-download/share-and-download.component.ts
@@ -43,7 +43,7 @@ export class ShareAndDownloadComponent {
       return;
     }
 
-    const downloadLink = this.socialShareService.createDownloadUrl(preprint.id);
+    const downloadLink = this.socialShareService.createDownloadUrl(preprint.id, 'preprint');
     const downloadWindow = window.open(downloadLink);
 
     if (!downloadWindow) {
diff --git a/src/app/features/preprints/pages/preprint-download-redirect/preprint-download-redirect.component.spec.ts b/src/app/features/preprints/pages/preprint-download-redirect/preprint-download-redirect.component.spec.ts
index 8bbf62371..a1f9454cd 100644
--- a/src/app/features/preprints/pages/preprint-download-redirect/preprint-download-redirect.component.spec.ts
+++ b/src/app/features/preprints/pages/preprint-download-redirect/preprint-download-redirect.component.spec.ts
@@ -58,7 +58,7 @@ describe('PreprintDownloadRedirectComponent', () => {
   it('should redirect to download URL when id is present in browser', () => {
     const redirectSpy = vi.spyOn(PreprintDownloadRedirectComponent.prototype, 'redirect').mockImplementation(vi.fn());
     const { mockSocialShareService } = setup({ id: MOCK_ID });
-    expect(mockSocialShareService.createDownloadUrl).toHaveBeenCalledWith(MOCK_ID);
+    expect(mockSocialShareService.createDownloadUrl).toHaveBeenCalledWith(MOCK_ID, 'preprint');
     expect(redirectSpy).toHaveBeenCalledWith(MOCK_DOWNLOAD_URL);
     redirectSpy.mockRestore();
   });
diff --git a/src/app/features/preprints/pages/preprint-download-redirect/preprint-download-redirect.component.ts b/src/app/features/preprints/pages/preprint-download-redirect/preprint-download-redirect.component.ts
index 95dae4b89..81d1a9823 100644
--- a/src/app/features/preprints/pages/preprint-download-redirect/preprint-download-redirect.component.ts
+++ b/src/app/features/preprints/pages/preprint-download-redirect/preprint-download-redirect.component.ts
@@ -24,7 +24,7 @@ export class PreprintDownloadRedirectComponent {
       return;
     }
 
-    const url = this.socialShareService.createDownloadUrl(id);
+    const url = this.socialShareService.createDownloadUrl(id, 'preprint');
     this.redirect(url);
   }
 
diff --git a/src/app/shared/helpers/download-link.helper.ts b/src/app/shared/helpers/download-link.helper.ts
new file mode 100644
index 000000000..7de4b7176
--- /dev/null
+++ b/src/app/shared/helpers/download-link.helper.ts
@@ -0,0 +1,5 @@
+export function appendDownloadTrackingParams(link: string, source: string): string {
+  const separator = link.includes('?') ? '&' : '?';
+  const tz = Intl.DateTimeFormat().resolvedOptions().timeZone;
+  return `${link}${separator}source=${encodeURIComponent(source)}&tz=${encodeURIComponent(tz)}`;
+}
diff --git a/src/app/shared/services/file-download.service.spec.ts b/src/app/shared/services/file-download.service.spec.ts
index afb9e2372..5e6706eb6 100644
--- a/src/app/shared/services/file-download.service.spec.ts
+++ b/src/app/shared/services/file-download.service.spec.ts
@@ -44,7 +44,7 @@ describe('FileDownloadService', () => {
     });
 
     expect(dataciteService.logFileDownload).toHaveBeenCalledWith('node-1', 'nodes');
-    expect(filesService.getFolderDownloadLink).toHaveBeenCalledWith('/folder/download/');
+    expect(filesService.getFolderDownloadLink).toHaveBeenCalledWith('/folder/download/', 'files');
     expect(openSpy).toHaveBeenCalledWith('/folder/download/?zip=', '_blank');
   });
 
@@ -63,6 +63,7 @@ describe('FileDownloadService', () => {
 
   it('logs datacite and opens file download link', () => {
     const openSpy = vi.spyOn(window, 'open').mockReturnValue({ focus: vi.fn() } as unknown as Window);
+    const timeZone = Intl.DateTimeFormat().resolvedOptions().timeZone;
 
     service.downloadFile({
       resourceId: 'node-1',
@@ -71,11 +72,12 @@ describe('FileDownloadService', () => {
     });
 
     expect(dataciteService.logFileDownload).toHaveBeenCalledWith('node-1', 'nodes');
-    expect(openSpy).toHaveBeenCalledWith('/file/download/', '_blank');
+    expect(openSpy).toHaveBeenCalledWith(`/file/download/?source=files&tz=${encodeURIComponent(timeZone)}`, '_blank');
   });
 
   it('downloads file from file model', () => {
     const openSpy = vi.spyOn(window, 'open').mockReturnValue({ focus: vi.fn() } as unknown as Window);
+    const timeZone = Intl.DateTimeFormat().resolvedOptions().timeZone;
     const file = FileModelMock.simple({
       kind: FileKind.File,
       links: { ...FileModelMock.simple().links, download: '/file/download/' },
@@ -88,7 +90,7 @@ describe('FileDownloadService', () => {
     });
 
     expect(dataciteService.logFileDownload).toHaveBeenCalledWith('node-1', 'nodes');
-    expect(openSpy).toHaveBeenCalledWith('/file/download/', '_blank');
+    expect(openSpy).toHaveBeenCalledWith(`/file/download/?source=files&tz=${encodeURIComponent(timeZone)}`, '_blank');
   });
 
   it('downloads folder zip from file model', () => {
@@ -106,7 +108,7 @@ describe('FileDownloadService', () => {
     });
 
     expect(dataciteService.logFileDownload).toHaveBeenCalledWith('node-1', 'nodes');
-    expect(filesService.getFolderDownloadLink).toHaveBeenCalledWith('/folder/upload/');
+    expect(filesService.getFolderDownloadLink).toHaveBeenCalledWith('/folder/upload/', 'files');
     expect(openSpy).toHaveBeenCalledWith('/folder/upload/?zip=', '_blank');
   });
 });
diff --git a/src/app/shared/services/file-download.service.ts b/src/app/shared/services/file-download.service.ts
index 61f377a74..5999f8d79 100644
--- a/src/app/shared/services/file-download.service.ts
+++ b/src/app/shared/services/file-download.service.ts
@@ -2,12 +2,17 @@ import { isPlatformBrowser } from '@angular/common';
 import { inject, Injectable, PLATFORM_ID } from '@angular/core';
 
 import { FileKind } from '@osf/shared/enums/file-kind.enum';
+import { appendDownloadTrackingParams } from '@osf/shared/helpers/download-link.helper';
 import { FileModel } from '@osf/shared/models/files/file.model';
 import { DataciteService } from '@osf/shared/services/datacite/datacite.service';
 import { FilesService } from '@osf/shared/services/files.service';
 
 import { FileDownloadContext } from '../models/files/file-download-context.model';
 
+// Downloads that go through this service all originate from the files UI, so they're
+// tagged with the 'files' source for download telemetry.
+const DOWNLOAD_SOURCE = 'files';
+
 @Injectable({
   providedIn: 'root',
 })
@@ -22,7 +27,7 @@ export class FileDownloadService {
     }
 
     this.dataciteService.logFileDownload(resourceId, resourceType).subscribe();
-    this.openInNewTab(this.filesService.getFolderDownloadLink(downloadLink));
+    this.openInNewTab(this.filesService.getFolderDownloadLink(downloadLink, DOWNLOAD_SOURCE));
   }
 
   downloadFile({ resourceId, resourceType, downloadLink }: FileDownloadContext): void {
@@ -31,7 +36,7 @@ export class FileDownloadService {
     }
 
     this.dataciteService.logFileDownload(resourceId, resourceType).subscribe();
-    this.openInNewTab(downloadLink);
+    this.openInNewTab(appendDownloadTrackingParams(downloadLink, DOWNLOAD_SOURCE));
   }
 
   downloadFileOrFolder(params: { resourceId: string; resourceType: string; file: FileModel }): void {
@@ -44,12 +49,12 @@ export class FileDownloadService {
     this.dataciteService.logFileDownload(resourceId, resourceType).subscribe();
 
     if (file.kind === FileKind.File) {
-      this.openInNewTab(file.links.download);
+      this.openInNewTab(appendDownloadTrackingParams(file.links.download, DOWNLOAD_SOURCE));
       return;
     }
 
     if (file.links.upload) {
-      this.openInNewTab(this.filesService.getFolderDownloadLink(file.links.upload));
+      this.openInNewTab(this.filesService.getFolderDownloadLink(file.links.upload, DOWNLOAD_SOURCE));
     }
   }
 
diff --git a/src/app/shared/services/files.service.spec.ts b/src/app/shared/services/files.service.spec.ts
index 6f8a355ab..5168591cb 100644
--- a/src/app/shared/services/files.service.spec.ts
+++ b/src/app/shared/services/files.service.spec.ts
@@ -118,8 +118,11 @@ describe('FilesService', () => {
 
   it('should build folder download link with correct separator', () => {
     setup();
-    expect(service.getFolderDownloadLink('/files/1')).toBe('/files/1?zip=');
-    expect(service.getFolderDownloadLink('/files/1?foo=bar')).toBe('/files/1?foo=bar&zip=');
+    const timeZone = Intl.DateTimeFormat().resolvedOptions().timeZone;
+    expect(service.getFolderDownloadLink('/files/1')).toBe(`/files/1?zip=&source=&tz=${encodeURIComponent(timeZone)}`);
+    expect(service.getFolderDownloadLink('/files/1?foo=bar')).toBe(
+      `/files/1?foo=bar&zip=&source=&tz=${encodeURIComponent(timeZone)}`
+    );
   });
 
   it('should return empty reference when addons api response has no data', async () => {
diff --git a/src/app/shared/services/files.service.ts b/src/app/shared/services/files.service.ts
index 4958da928..2aa60a2e1 100644
--- a/src/app/shared/services/files.service.ts
+++ b/src/app/shared/services/files.service.ts
@@ -21,6 +21,7 @@ import { PaginatedData } from '@osf/shared/models/paginated-data.model';
 
 import { FileKind } from '../enums/file-kind.enum';
 import { ResourceType } from '../enums/resource-type.enum';
+import { appendDownloadTrackingParams } from '../helpers/download-link.helper';
 import { AddonMapper } from '../mappers/addon.mapper';
 import { ContributorsMapper } from '../mappers/contributors';
 import { FilesMapper } from '../mappers/files/files.mapper';
@@ -173,9 +174,9 @@ export class FilesService {
     return this.jsonApiService.post<FileResponseJsonApi>(link, body);
   }
 
-  getFolderDownloadLink(link: string): string {
+  getFolderDownloadLink(link: string, source = ''): string {
     const separator = link.includes('?') ? '&' : '?';
-    return `${link}${separator}zip=`;
+    return appendDownloadTrackingParams(`${link}${separator}zip=`, source);
   }
 
   getFileTarget(fileGuid: string): Observable<FileDetailsWithMeta> {
diff --git a/src/app/shared/services/social-share.service.spec.ts b/src/app/shared/services/social-share.service.spec.ts
index 04060b9f7..5e1c51ec6 100644
--- a/src/app/shared/services/social-share.service.spec.ts
+++ b/src/app/shared/services/social-share.service.spec.ts
@@ -79,9 +79,13 @@ describe('SocialShareService', () => {
   it('should create web urls', () => {
     setup();
 
+    const timeZone = Intl.DateTimeFormat().resolvedOptions().timeZone;
+
     expect(service.createPreprintUrl('pp-1', 'osf')).toBe('https://osf.test/preprints/osf/pp-1');
     expect(service.createGuidUrl('abc12')).toBe('https://osf.test/abc12');
-    expect(service.createDownloadUrl('res-1')).toBe('https://osf.test/download/res-1');
+    expect(service.createDownloadUrl('res-1')).toBe(
+      `https://osf.test/download/res-1?source=&tz=${encodeURIComponent(timeZone)}`
+    );
   });
 
   it('should generate social action items from platform config', () => {
diff --git a/src/app/shared/services/social-share.service.ts b/src/app/shared/services/social-share.service.ts
index d8c9832f2..faa5db904 100644
--- a/src/app/shared/services/social-share.service.ts
+++ b/src/app/shared/services/social-share.service.ts
@@ -4,6 +4,7 @@ import { ENVIRONMENT } from '@core/provider/environment.provider';
 
 import { SOCIAL_PLATFORMS } from '../constants/social-platforms.const';
 import { SOCIAL_SHARE_URLS } from '../constants/social-share.config';
+import { appendDownloadTrackingParams } from '../helpers/download-link.helper';
 import { SocialShareContentModel } from '../models/socials/social-share-content.model';
 import { SocialShareLinksModel } from '../models/socials/social-share-links.model';
 import { SocialsShareActionItem } from '../models/socials/socials-share-action-item.model';
@@ -56,8 +57,8 @@ export class SocialShareService {
     return `${this.webUrl}/${guid}`;
   }
 
-  createDownloadUrl(resourceId: string): string {
-    return `${this.webUrl}/download/${resourceId}`;
+  createDownloadUrl(resourceId: string, source = ''): string {
+    return appendDownloadTrackingParams(`${this.webUrl}/download/${resourceId}`, source);
   }
 
   generateSocialActionItems(content: SocialShareContentModel): SocialsShareActionItem[] {