4K clips blow past WhatsApp and mailbox limits fast. Knock resolution down first, then set an exact megabyte target in the cloud so a long encode does not kill the browser tab.
1. Upload the 4K source
Open vidsmaller.com. Drop MP4, MOV, or another supported file. Guests get large per-file limits and limited credits. No watermark; uploads are removed after the job.
2. Cap the size, then fix resolution
In Basic, tap WhatsApp or Email, or drag Output file size (often ~16MB for WhatsApp comfort, ~18–20MB toward a 25MB mailbox).
In Advanced, set 1080p (or 720p) before chasing codecs. Prefer H.264 + MP4 for playback. H.265 can go smaller but older phones may fail.
3. Download and send
Start the job, wait, download. You can leave the page; the result link stays until it expires.
Still too big? Drop one more resolution step and re-run before switching codecs.
Short private clips that fit in memory can stay local: videocompress.dev.
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