Can I edit 4K video in a browser?
Editing 4K footage in a browser — yes: EseCut remuxes imported media for instant scrubbing and previews smoothly regardless of source resolution, so cutting 4K camera files works fine on an ordinary laptop. The preview pipeline is doing the clever work, not brute-forcing full-res frames.
Exporting in 4K is the separate question: EseCut's free plan exports up to 1080p (which is also what most social platforms serve viewers anyway), while 4K export sits in the Pro tier ($12/mo) with a priority render queue. Practical guidance: shoot 4K if you like — the extra resolution gives you crop/zoom room in the edit — and export 1080p until a specific delivery actually demands a 4K master.
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EseCut runs in your browser: timeline, auto captions, effects, and clean 1080p export.