0.1s Keyframe Stream-Copy•Zero Server Upload

Trim MP4 Video Online

Slice intro and outro dead air from MP4 videos in 0.1s with zero re-encoding artifacts. 100% private in-browser RAM.

stream-cut v1.0 · Trim MP4 Video Online

0.1s Stream-Copy Ready

Drop your MP4 here or browse files

Slice intro and outro dead air from MP4 videos in 0.1s with zero re-encoding artifacts. 100% private in-browser RAM.

0.1s Stream-Cut 100% Private RAM No Watermarks

End-to-End Local Architecture

Trimmed on Your Device, End to End

Your video never uploads to an external server. Browser RAM cuts the stream in 0.1 seconds.

Your Device

Original Video File

In-Browser RAM

WASM Stream-Cut (0.1s)

Instant Download

100% Watermark-Free

Everyday Applications

Why Use In-Browser Stream Trimming?

Cut Dead Air from Gaming Clips

Slice off the first 30 seconds of waiting in lobby queues before sharing your clutch highlights on Discord or Reddit.

Clean Up Meeting & Screen Recordings

Trim out awkward pre-meeting banter or sensitive browser tabs from Loom and Zoom captures in under 1 second.

Prep Footage for Social Media

Cut videos down to the exact 15, 30, or 60-second limit required for Instagram Reels, YouTube Shorts, and TikTok.

Instant Video Shortening for Email

Quickly reduce presentation clips to just the relevant 20 seconds to stay safely under Gmail’s 25MB attachment limit.

Architectural Comparison

ClipShrink vs. Cloud Cutters (Clideo & 123apps)

Why stream-cutting inside local browser memory is faster, cleaner, and strictly safer.

Feature	Legacy Cloud Editors (Clideo / 123apps)	ClipShrink In-Browser RAM
Trimming Speed	45–90s (Slow network upload + server queue)	0.1–0.5s (Instant in-memory stream copy)
Watermark Policy	Prominent branding watermark unless paid (Clideo)	100% Clean & Watermark-Free Always
File Privacy & Storage	Stored on remote servers for several hours	100% In-Browser RAM (Never leaves your device)
Video Quality	Re-encoded / compressed on free tiers	100% Lossless (Bit-for-bit stream copy)
Account Requirement	Email signup or Google login required to export	Zero signups, no accounts, unlimited use

Frequently Asked Questions

Everything You Need to Know

How do I trim an MP4 video online without losing quality?

Drop your MP4 into ClipShrink, drag the start and end handles, and click 'Trim Video Now'. Our WebAssembly engine performs an instant stream-copy cut (-c copy) directly in browser RAM. It rewrites container timestamps without re-encoding frames, giving you bit-for-bit identical video quality in 0.1 seconds.

Does trimming an MP4 file reduce its file size?

Yes. Removing unwanted intro or outro segments physically discards those frames from the file container, proportionally reducing file size without any compression degradation.

Is there a file size limit for trimming MP4 videos?

ClipShrink supports MP4 files up to 500MB on desktop browsers and up to 150MB on mobile Safari and Chrome. Because stream-copying does not re-encode, multi-minute files process almost instantly.

Dedicated Video Trimming Tools

0.1s Stream-Copy

Trim MP4 Video (4.4K) →Cut MKV Video (OBS) →Trim MOV Video (iPhone) →Cut Video for Discord →Trim WebM (Screens) →Cut GIF (Memes) →Lossless Stream Cutter →Trim No Watermark →