Why AirDrop can quietly lower your video quality
You AirDropped a clip from your iPhone and the file that arrived is smaller than the one you shot. You are not imagining it, and it is not a bug: it is a compatibility conversion most people never see.
What is actually happening
Modern iPhones record video in HEVC (often in HDR) and photos in HEIC — formats older devices and many apps cannot read. Apple documents that when you share this media with AirDrop, Messages or email and the receiving device doesn't support the newer formats, it might be shared in a more compatible format, such as JPEG or H.264 (Apple Support). That conversion is a re-encode: what arrives is a new copy made from your original, not the original itself. Apple does not document exactly what happens to HDR in that conversion, so the honest test is to compare the files.
Messages follows the same format rule, and its optional Low Quality Image Mode sends smaller images on purpose. The quick sign that something was converted along the way: the file that arrives is smaller than the file that left.
How to send true originals from an iPhone
- Check the switch: in the Photos share sheet, tap Options at the top and enable All Photos Data before AirDropping — that sends the genuine original, metadata and all.
- Camera formats: Settings → Camera → Formats. "Most Compatible" makes the phone itself record in older, heavier formats. "High Efficiency" keeps the good stuff — you just need a transfer path that respects it.
- Use a wire for batches: Image Capture or the Photos app over a USB cable — after setting Settings → Apps → Photos → Transfer to Mac or PC → Keep Originals on the iPhone (on “Automatic” it may convert while importing).
- Never Messages/WhatsApp for keepsakes — WhatsApp compresses photos and videos sent as media by default, and Messages may convert them.
The deeper problem: "sharing" is not "transferring"
Every share pipeline optimizes for convenience and compatibility, not fidelity. Once you care about your footage — editing it, archiving it, selling it — you need a transfer path: one that moves the exact bytes and proves it.
That is the principle ZiggSend is built on. It moves the exact bytes from iPhone and Android to a Mac or Windows PC over your own Wi-Fi (and from Android to a Mac by cable), verifying every file byte for byte — anything that arrives different from the original is discarded and flagged. No cloud, no account, no compression.