Video Compressor: Photo Review

Shrink large 4K and HD videos straight on your iPhone, then review the duplicates, near-identical bursts and screenshots quietly filling your camera roll. Video compression runs through Apple's AVFoundation; photo matching runs on Apple's Accelerate and Vision frameworks. Everything happens on-device — nothing is uploaded, and no account is required.

VIDEO COMPRESSION THAT SHOWS ITS WORK
- Three export presets — 1080p, 720p and 480p — for MP4 movies of any length.
- See the estimated size before you export, so you know what each file will save you.
- A pre-flight storage check confirms there's room to write the new file before compression starts.
- Compressed copies are saved back into your Photos library, ready to share, message or upload anywhere.
- Exports run on a dedicated background engine, so long 4K clips don't freeze the app.

FIND DUPLICATE AND SIMILAR PHOTOS
- Exact duplicates are matched across your whole library, however many years apart they were saved.
- Similar shots — burst sequences, retries, the same scene five times — are grouped by visual structure, not by file name or date.
- Matching combines a 64-bit gradient hash, a hardware-accelerated DCT perceptual hash built on Apple's Accelerate (vDSP) framework, and 2D Haar wavelet analysis.
- Similar videos are compared using Apple Vision feature prints after a duration and resolution pre-filter.
- Move the sensitivity slider and the entire library regroups in memory in milliseconds.

REVIEW BEFORE ANYTHING IS REMOVED
- Open any group into a side-by-side workspace with synchronized pinch-to-zoom and pan, so you can compare two shots at the same point in the frame.
- Every photo carries a quality score drawn from sensor resolution tier (12MP vs 48MP), Vision facial sharpness and exposure histogram analysis.
- Four selection strategies: Keep Best, Keep Newest, Keep Largest, Keep Favorites.
- Favorites stay protected, and you confirm every deletion yourself.

MERGE DUPLICATE CONTACTS WITHOUT LOSING DAT…