WhatsApp caps video attachments (often 16–64 MB depending on platform). Uploading to random online compressors sends your clip to third-party servers first. Open MBox’s video compressor, drop your MP4 or MOV, and set a target size under WhatsApp’s limit. Processing stays on your device — no queue, no account. Export locally and attach from your phone or desktop. Ideal for family videos, work updates, and groups where privacy matters.