0.5s Stream-Copy Remux•Zero Server Upload

Convert HEVC / H.265 to MP4

Convert Apple High Efficiency HEVC recordings into universal H.264 MP4 clips playable on Windows PC, Android, and Discord.

remux-engine · Convert HEVC / H.265 to MP4

Instant RAM Pipeline

Drop your MP4 file here or browse files

Convert Apple High Efficiency HEVC recordings into universal H.264 MP4 clips playable on Windows PC, Android, and Discord.

Sub-Second Remuxing 100% In-Browser RAM Zero Quality Loss

Instant In-Browser Pipeline

How In-Browser Stream Remuxing Works

Zero Upload

Drop Your File

Drop your MKV, HEVC, MOV, WebM, or audio file. The file is read directly into your browser's private memory.

0.5s Execution

Stream-Copy Remux

Our WebAssembly engine rewrites the container headers instantly without re-encoding video frames.

Verified Output

Preview & Download

Play your converted video right in the browser to verify quality, then download immediately with zero watermarks.

Performance Breakdown

ClipShrink In-Browser vs. Cloud Converters

Why stream-copying in browser RAM outperforms remote server conversions on every metric.

Feature	Traditional Cloud Converters	ClipShrink In-Browser RAM
Conversion Speed	30–90s (Upload + Queue + Encode)	0.5–2.0s (Local RAM Stream-Copy)
File Privacy	Uploaded & stored on remote servers	100% In-Browser RAM (Never leaves device)
Video Quality	Often compressed or re-encoded	Lossless (Bit-for-bit identical stream copy)
Free File Limits	Capped at 25MB–100MB on free tiers	Generous 500MB browser capacity
Watermarks & Ads	Aggressive ads, watermarks, paywalls	Zero watermarks, zero accounts, 100% free

Frequently Asked Questions

Everything You Need to Know

Why does Windows Media Player say 'HEVC Video Extension required'?

Modern iPhones record in High Efficiency Video Coding (H.265 / HEVC) by default. Microsoft charges $0.99 for the HEVC codec on Windows. ClipShrink converts your HEVC files into universally supported H.264 MP4 format for free.

Can I convert iPhone 4K HEVC video to standard MP4?

Yes. ClipShrink transcodes HEVC video into web-standard H.264 with AAC stereo audio and faststart metadata directly on your device CPU.

More Instant Format Converters

100% In-Browser RAM

MKV to MP4 (OBS) →HEVC to MP4 (iPhone) →MOV to MP4 (QuickTime) →WebM to MP4 (Screen) →QuickTime to MP3 →Opus to MP3 (Discord) →M4V to MP4 →GIF to MP4 (Meme) →