SwiftConvert

Convert video and audio right on your iPhone or iPad. Nothing uploads, nothing leaves the device.

SwiftConvert turns files into the formats your apps and devices actually accept, and does the whole job on-device. No server, no account, no tracking, no analytics.

PLAY THE MKVs THAT WOULDN'T PLAY
iPhone and iPad can't open MKV files. SwiftConvert reads them itself and rebuilds them as MP4. H.264 and HEVC video is copied across untouched — no quality loss, no long re-encode — while AC-3 and E-AC-3 soundtracks become AAC with 5.1 channels intact. Keep just the audio and subtitle track you pick, or keep every one of them as alternates you can switch between in the player. Chapter marks come across too.

TRIM, CROP AND ROTATE
Open any queued file and set a start and end point, straighten a clip shot sideways, or crop it to 16:9, 9:16, square, 4:3 or 21:9. Pick an aspect and SwiftConvert looks for the subject in the frame and offers to center the crop on it — a small on-device suggestion you can accept with one tap or ignore entirely and drag the position slider by hand, exactly as before. Nothing is applied until you tap Use, and if it doesn't find a clear subject the editor behaves just like it always has. Trimming and rotating are lossless — the video still passes through without being re-encoded. Only cropping changes the pixels, and the editor tells you when that's about to happen.

FORMATS AND PRESETS
Output MP4, MOV or M4V with H.264 or HEVC video and AAC audio, or pull the audio out on its own as M4A in AAC or lossless ALAC. Four presets are built in — iPhone, Web, Archive and Podcast — and any combination you settle on can be saved as your own preset with a name and an icon.

ENHANCE WHILE YOU CONVERT
Super Resolution upscales and sharpens. Motion Smoothing multiplies the frame rate 2x to 8x. Motion Blur, Noise Reduction and two faster low-latency modes round out the set. Everything runs on the media hardware in your device, one enhancement per conversion, and the app tells you up front which ones your device supports.

DESCRIBE WHAT YOU NEED
Smart Convert takes a plain sentence — "archive at the best quality", "just the audio" — and picks the container, codecs and quality for you, explains the choice in a line, and offers to save it as a preset. Needs a device that supports Apple Intelligence.

RUN IT FROM SHORTCUTS
Convert Files takes files and a preset and hands back the results without opening the app, so it can sit in the middle of a larger shortcut. Add Files to SwiftConvert Queue drops them into the app instead, ready for you to check the settings first. Both work with Siri. On iOS 27 and iPadOS 27, Convert Files carries on in the background for as long as a long conversion takes.

BUILT FOR BATCHES
Add files from the picker, or open them in SwiftConvert from the Files app or another app's share sheet, and queue as many as you like. Start them together, watch per-file progress, stop the batch at any point, and retry anything that didn't make it — straight from the completion notification if you like. Outputs are named so nothing gets overwritten.

ON YOUR WRIST
The Apple Watch app is a remote for the queue on your iPhone. See overall and per-file progress, start or stop the batch, retry failed files, and pick a different preset. A complication keeps the batch's progress on your watch face, and a Library page shows how many files you've converted and the most recent ones. The converting still happens on your iPhone, so Start, Stop and Retry need it nearby.

EVERYTHING YOU'VE CONVERTED
Finished files are listed with their size and format, ready to play, send through the share sheet, or delete when you need the space back. Each batch also leaves a report of what succeeded, what failed, and why.

PRIVATE BY DEFAULT
Every conversion happens on your device. There is no server to sign in to, no upload step, and no analytics — your videos stay yours.