How to compress videos on iPhone without losing quality
Use MemeScanr's Boost feature. Boost compresses videos on iPhone using hardware-accelerated H.264 or H.265 encoding at quality settings tuned to preserve visible fidelity. Typical compression saves 50-70% of file size without noticeable loss. Runs entirely on-device — no internet, no upload, no cloud processing.
How Boost compresses videos
Boost uses iOS's built-in AVFoundation video encoding pipeline. That's the same hardware encoder Apple's Camera app uses when it records HEVC video. Boost feeds your existing video through it at a configurable target bitrate, producing a smaller H.264 or H.265 file that looks virtually identical to the original on an iPhone screen.
Typical compression results
| Source | Original size | After Boost | Saved |
|---|---|---|---|
| 4K 60fps recording (1 min) | ~340 MB | ~120 MB | ~65% |
| 1080p 30fps recording (1 min) | ~90 MB | ~32 MB | ~64% |
| Slo-mo recording (30 sec) | ~280 MB | ~95 MB | ~66% |
| Screen recording (1 min) | ~55 MB | ~18 MB | ~67% |
Compression ratios vary based on content. Low-motion video (talking heads, screen recordings) compresses more than fast-motion sports or concert footage.
Replace original or save a copy?
Boost offers two modes:
Replace original — the compressed version takes the place of the original in your Photos library. The original is moved to Recently Deleted and permanently purged after 30 days. Maximum storage savings.
Save new copy — both files coexist. Use this if you want to compare before deleting, or if you're shipping a compressed version somewhere but keeping the master.
Can Boost compress PDFs?
Yes. The same pipeline runs PDF compression by recompressing embedded images inside the PDF. Typical PDFs shrink 30-50%. Good for sharing documents over iMessage or email where the 25 MB attachment cap bites.
Does Boost work offline?
Yes. Every step of Boost runs on your device using Apple's built-in encoders. No internet connection is required. Your video never leaves your iPhone.