"HD" is better, not lossless
It's a common misconception that WhatsApp's HD toggle sends a truly original file. In reality, it applies a lighter, higher-bitrate compression than the standard setting β a real improvement, but not identical to the source file.
The tradeoff of sending as a document
A file sent as a document appears in the chat as a downloadable attachment rather than an inline image or video preview, and it also doesn't get automatically saved to the recipient's photo gallery the way a normal photo message does β the recipient needs to download and save it manually if they want it in their gallery.
Frequently Asked Questions
Does sending as HD use more data than the default setting?
Yes β HD photos and videos are larger files than the standard compressed version, so they use more mobile data if you're not on Wi-Fi, though still less than sending as an uncompressed document.
Can I send a video as a document too?
Yes β the same Document attachment option works for video files, and it preserves the original file exactly, with no re-encoding or quality loss.