The browser is the editor now
Safari on iOS 17 and newer runs web-based video editors natively. Decoding, processing and exporting happen on the phone itself. That means trimming, compressing, merging and format conversion all work in a browser tab, with no App Store download and no account.
What works in an iPhone browser
The practical list: trim the boring parts, compress a big clip before sending it, merge several clips into one, convert iPhone's MOV files to MP4 so they play everywhere, and crop to 9:16 for Shorts and Reels. All of it runs locally. The video never leaves the phone.
One honest limit: screen recording
Web-based screen capture doesn't work on phones. Mobile browsers block it. Use the iPhone's built-in screen recorder for that, then bring the clip into the browser to trim or convert it. Editing after recording: yes. Recording itself: use the phone's own tool.
Step by step from camera roll to share
Open the tool page in Safari, tap the upload area and pick the clip from Photos. Choose your operation (trim, compress, merge, convert or crop) and let the page process it on the phone. When it's done, tap download and the file lands in your Files app, ready to share.
iPhone-specific tips
iPhone footage often comes out as MOV with HEVC compression. Convert to MP4 when the recipient might not have an Apple device. Clear some space before editing long clips in the browser, and use compression presets when sending over chat, where a 4K file is overkill anyway.