Free · No signup · No watermark

Compress video on iPhone

No app to install, no subscription, no “free trial” trap. Open this page in Safari, pick a video from Photos, and get back a smaller MP4 — all on your device.

Drop your video here

or

MP4, MOV, WebM… — processed 100% on your device

Target size

🔒 Your video never leaves your device. No upload, no signup, no watermark.

Compress on iPhone in 3 steps

1

Open it in Safari or Chrome

No app to install — the tool runs right in your mobile browser. Tap to browse your photo library or Files.

2

Use the 20 MB default

20 MB is pre-selected as a safe default for sharing. VidSizer computes the exact bitrate for your clip automatically.

3

Save and share

Download the compressed video to your iPhone and share it anywhere — small file, full quality control.

How it works on iPhone

Tap browse files above and choose a video from your Photo Library. Pick a target size — 20 MB is a safe default for sharing — and hit Compress. When it's done, the MP4 downloads to your Files app, where you can save it back to Photos or share it anywhere.

Two iPhone tips: keep Safari in the foreground while it encodes (iOS throttles background tabs), and plug in if the clip is long — encoding uses your phone's CPU, which is the whole reason nothing gets uploaded.

Need a different target? Compress on Android · Compress to 20 MB · Compress for WhatsApp

FAQ

Does this work in Safari on iPhone?

Yes. Open this page in Safari, tap browse files, and pick a video from your Photo Library. No app install, no configuration — it runs entirely in the browser tab.

Where does the compressed video go?

Safari downloads the MP4 to your Files app. From there you can save it to Photos, AirDrop it, or attach it to any message or email.

Is my video uploaded to a server?

No. Compression runs on your iPhone's own chip via WebAssembly. Your video never leaves your device — which is also why it works on airplane mode after the page loads.