No: Dropbox keeps the file as uploaded

Does Dropbox compress photos?

No. Dropbox keeps the file you upload, and downloading it saves a separate local copy of that same file. Previews have size limits: on paid plans a photo previews in the browser if it is under 100 MB or 50 megapixels, or 200 MB or 50 megapixels for RAW, and anything bigger has to be downloaded to be seen.

Last updated 1 October 2026

What Dropbox does to a photo

From the Dropbox help center, checked 1 October 2026.

What you do	What happens to the photo	Limit
Upload	Kept as the file you uploaded	2 TB per file. Browser uploads over 375 GB may time out.
Preview	Shown in the browser without downloading	Paid plans: images under 100 MB or 50 MP, RAW under 200 MB or 50 MP
Download a file	Saves a separate local copy of that file	No size limit for single files
Download a folder	Arrives as a .zip file	Under 250 GB uncompressed and fewer than 10,000 files
Share a link	Recipients can view and download without a Dropbox account	Passwords and expiry only on Professional, Standard, Advanced and Enterprise
iPhone camera uploads	Can save HEIC photos as JPG, which removes some HEIF features	Set with Save HEIC Photos as

Preview or file: know which one you are looking at

A Dropbox preview lets you view, comment on and share a file without downloading it. Previews depend on the file: Dropbox only previews supported types under its size limits, shows This file is too big to preview for anything larger, and generates previews only for the file types available to the file's owner.

A download is different: it is a separate local copy of the file stored in Dropbox, so judge sharpness and color on the downloaded file. To confirm a copy is exact, compare it with your original in the file comparison tool.

One exception: iPhone camera uploads as JPG

The Dropbox app can upload iPhone photos as HEIC or save them as JPG, using the Save HEIC Photos as setting. Dropbox notes that converting to JPG removes some features of HEIF files, and that changing the setting does not affect photos already uploaded. If you want the HEIC files as your iPhone saved them, check this setting before camera uploads run.

Share photos from Dropbox at full quality

Upload the finished files
For big uploads use the Dropbox desktop app; uploads over 375 GB in a browser may time out.
Copy a link
On dropbox.com, hover over the folder, click Share, then Copy link. Your client does not need a Dropbox account to view or download.
Ask your client to download, not just preview
A preview is for viewing; a download is a copy of the file itself, so ask your client to judge quality on the downloaded photos.

Common questions

Does Dropbox reduce photo quality on upload?

No. Dropbox keeps the file you upload. One exception: iPhone camera uploads set to save HEIC photos as JPG, which Dropbox says removes some HEIF features.

Can Dropbox preview RAW files?

Yes, for RAW types including .cr2, .nef, .dng, .arw and .raf, as long as the file is under 200 MB or 50 megapixels. Dropbox lists these previews for paid plans. Anything bigger shows This file is too big to preview, so download it instead.

Can clients download from a Dropbox link without an account?

Yes. Dropbox says you don't need an account to view the files in a shared link, and you can download them to your computer. Joining a shared folder does need an account.

Does downloading a Dropbox folder as a ZIP lower photo quality?

No. ZIP is a lossless archive, so the photos inside are unchanged. Dropbox only downloads a folder that is under 250 GB uncompressed with fewer than 10,000 files.

Can I password protect a Dropbox link?

Only on Dropbox Professional, Standard, Advanced and Enterprise, which can add passwords and expiration dates to shared links.

How big can a Dropbox Transfer be?

2 GB on Basic, 50 GB on Plus and Family, 100 GB on Professional, Essentials, Standard, Advanced, Business and Education, and 250 GB on Business Plus and Enterprise. Basic, Plus and Family transfers expire after 7 days; other plans default to 30 days. The recipient needs no Dropbox account.

Deliver a shoot as a gallery link

Clients see 2000 px previews of every photo and can download the files you uploaded, byte for byte, with no account. Free up to 2 GB.

Prepare a gallery

Sources

Dropbox Help Center: What is the Dropbox file size limit?, How to preview files in Dropbox, What types of files can I preview in Dropbox?, Types of file preview errors and how to handle them, How to download a file or folder from Dropbox, How to share Dropbox files and folders with anyone, Do I need a Dropbox account to join a shared folder?, Dropbox Transfer: an overview, Support for HEIF and HEVC photo and video files. Checked on 1 October 2026.