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Video editors that don’t upload your footage

Most AI video editors send your media to a server for at least some features — transcription and captioning especially, because the models are large. On iPhone, iMovie and LumaFusion are fully local because they have no cloud AI at all. Talk keeps transcription, captions, voice isolation, silence detection and export on the device, and goes off-device only for AI image generation and dubbing. You can verify any such claim in thirty seconds with Airplane Mode.

“On-device” is a per-feature claim, not a per-app one

This is the part marketing copy tends to blur. An app is not simply local or cloud; each feature makes its own trip. The same editor can transcribe on your phone’s neural engine and still upload a frame to generate an image, because a diffusion model does not fit on a phone. When you read “processed on device”, the useful question is which processing.

Talk is a concrete example. Transcription, captions, voice isolation, silence detection, scene detection, face blur and export all run locally. AI image generation and AI dubbing do not, and cannot — the models are far too large. That is a real boundary rather than a marketing line, and it is worth demanding the same specificity from any vendor.

How to verify the claim yourself

1. Turn on Airplane Mode No Wi-Fi, no cellular. This is the whole test.
2. Import a clip and generate captions If captions appear, transcription is genuinely running on your device. If it spins, errors, or asks you to reconnect, your audio was being uploaded.
3. Try the other features you care about Silence removal, background removal, upscaling. Each one either works offline or it doesn’t, and that answers the question per feature.
4. Read the App Store privacy card, not the marketing page Apple requires disclosure of what data is collected and whether it is linked to you. It is less flattering and more accurate than a landing page.

Where each iPhone editor processes your footage

Compiled from vendor documentation and App Store privacy disclosures in August 2026. Vendors change processing locations without announcement — run the Airplane Mode test yourself rather than trusting this table a year from now.

When this actually matters

Not always. If you are editing holiday footage, cloud processing is a reasonable trade for a couple of accuracy points. It stops being reasonable in three situations:

• Confidential material. Client work, unreleased product footage, medical or legal recordings, anything under an NDA. “We uploaded it to a captioning service” is not a defence.
• Other people’s faces and voices. The people you filmed consented to being filmed by you. They did not consent to their biometrics being sent to a vendor they have never heard of. In some jurisdictions that distinction has legal weight.
• Long-term retention. Deletion is a promise, not a mechanism you control, and terms of service change. Footage that never left your phone has no retention policy to read.

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