Local-first video editing: what stays on your computer?
Local-first describes where important work and data live, but it does not automatically mean every feature works offline or no information ever leaves the device. Evaluate each part of the workflow separately: media storage, transcription, reasoning, exports and connected services.
Separate media from information about media
A source recording contains the picture and sound. A transcript contains the spoken content. Thumbnails, filenames and project titles can also reveal private information. A tool that never uploads the original video might still send a transcript for an AI feature.
Ask what each feature sends, to whom, for what purpose and whether you can decline. ‘AI runs locally’ and ‘this app has AI’ are not interchangeable statements. Optional hosted reasoning should have a clear boundary distinct from local processing.
Check offline behavior with a representative project
Install any required models or assets before testing without a connection. Use a non-sensitive sample and check opening, playback, editing, saving and export independently. If a feature needs a licence refresh, find out how long an already activated installation remains usable offline.
Do not treat a disconnected launch screen as proof of an offline workflow. The meaningful test is whether the tasks you rely on can finish, and whether failure leaves the local project available. Performance, supported formats and model availability are separate questions from privacy.
‘Is this private?’
‘When I generate an edit plan, do you send video, audio, transcript text, thumbnails or filenames? Can I finish the same project without that request?’
A workflow-specific question is easier to verify than a broad privacy slogan. A missing answer is a reason to investigate, not proof of wrongdoing.
Account for the services around editing
Update checks, model downloads, stock searches and billing can make network requests without uploading source footage. A stock query can still reveal the topic of a confidential project. Review what you are sending before using external search.
For Motionlark, the privacy page explains the product’s separation between local media and optional text-only reasoning, along with the website’s behavior. The browser tour uses synthetic material and keeps its edits in memory; it is not an offline desktop benchmark or proof of an installed editor’s performance.
Local storage still needs a backup plan
Keeping a project on your computer does not protect it from disk failure or accidental deletion. Understand whether a project contains media or only references it. Copying a small project file may not copy the source recordings it needs.
Decide whether a backup service is allowed to upload that material. A locally processing editor cannot prevent a separately configured sync folder from sending files to a cloud provider. Test restoring a non-sensitive project and relinking its media before relying on a backup strategy.
- I know which data classes each online feature receives.
- I can distinguish local models from hosted reasoning.
- I have checked the actual tasks I need without a connection.
- I understand account, update and stock-search requests.
- My backup includes the required source files and respects my privacy choices.
Explore the approach.
Try a reversible cut, a vertical frame and caption treatments in Motionlark’s interactive sample. No account or upload needed.
Take the product tour Read Motionlark’s privacy approach