Clinical images are the worst files to hand to a random upload service. A wound photo, a scan screenshot, a pre-op reference shot — that is identifiable patient data, and a browser upload means it lands on somebody else's disk under somebody else's policy. Skwish compresses files in the browser using the canvas API, so the pixels never leave the device. Files get smaller; nothing gets transmitted. That matters for a single photo sent to a colleague and it matters even more for a batch exported for a case file. The practical wins are the same as anywhere else: phone cameras output 3-8MB photos, email and messaging tools cap attachments well below that, and a clinical folder of forty images is unmanageable in its raw state. Compress the batch, keep enough detail for the clinical purpose, and export one ZIP.