NEW · FFmpeg.wasm · 100% Browser-Based

Free Video Trimmer

Trim videos with frame-accurate precision in your browser. Set in/out points, preview, export trimmed MP4. No upload, no signup, no watermark.

🎬
Drop a video file
MP4 · MOV · WebM · MKV · AVI · GIF
Files stay on your device · Never uploaded

Why Do This in Your Browser?

Trimming a video — picking a start and end point and discarding the rest — is the single most common video edit. Yet it's strangely hard to do well online: cloud tools upload your file, paid editors want a subscription, and desktop apps require installing software for a 30-second job.

This tool puts a frame-accurate trim in your browser. Drop a video, scrub to the start, set the in-point; scrub to the end, set the out-point; preview the trimmed range; export. When possible, the export is a stream copy (no re-encode, byte-exact, completes in seconds). When the trim doesn't land on a keyframe, the tool re-encodes only the affected segment to keep timing accurate.

How It Works

Video is encoded in groups of pictures (GOPs) — chunks of frames that depend on a single keyframe. Cutting between keyframes requires re-encoding the partial GOP; cutting on a keyframe is free. The tool auto-detects which mode applies to your trim points and picks the fastest path that preserves quality.

Use keyboard shortcuts for precision: J/K/L for shuttle, arrow keys for single-frame steps, I and O to set in/out points (DaVinci Resolve convention). Visual scrubber shows keyframes as bright marks — snap your trim points to them for instant export.

Tip: After trimming, shrink the result to a target file size with the Video Compressor. Trim multiple segments separately, then join them with the Video Merger for a multi-cut edit.

Common Use Cases

Cut Dead Space
Phone recordings always start late and end late. Trim 5 seconds off each end before sharing.
Extract a Clip
Pull a specific moment out of a longer recording — interview soundbite, sports highlight, podcast pull-quote.
Pre-Edit Trim
Trim raw footage to the useful range before importing into Premiere, Final Cut, or DaVinci Resolve. Smaller files, faster import.
Social Media Cuts
TikTok and Reels max at 60–90 seconds. Trim long-form content down to the strongest moment.
Confidential Redaction
Trim out the sensitive portion of a screen recording before sharing externally.
Looping Snippet
Extract a 10–30 second clip that loops well for embedded backgrounds or animated headers.

How We Compare

Honest read on free, paid, and self-hosted options for this kind of job:

UDT Video Trimmer (this tool): Free, browser-based, frame-accurate. Stream-copy when possible (seconds, not minutes). No upload, no watermark, no signup.
Clideo Trim: Free tier watermarks output. $9/mo to remove. Cloud-based — full file uploaded.
Kapwing Trim: Free tier 4-min limit + watermark. $16/mo. Cloud.
VEED.io Trim: Free tier watermarks + 720p cap. $12–$30/mo. Cloud.
QuickTime Player (Mac): Free, fast, frame-accurate — but Mac-only and re-encodes some formats slowly. This tool is the cross-platform equivalent.
Premiere / Final Cut / DaVinci Resolve: Professional-grade — overkill if you just need to trim 5 seconds off a clip and move on.

Frequently Asked Questions

Is the trim frame-accurate?
Yes — keyboard arrow keys step single frames at a time, and the in/out points snap to exact frame boundaries. When export hits a non-keyframe boundary, the tool re-encodes only the partial GOP to preserve frame accuracy.
Will the export be re-encoded?
When the in and out points both land on keyframes, the export is a stream copy — byte-exact and complete in seconds. Otherwise, only the partial GOP at each end is re-encoded; the middle is copied. Quality stays identical.
Are my videos uploaded anywhere?
No. The entire trim and export runs in your browser using FFmpeg.wasm. The 32MB engine downloads once, caches, and runs locally.
What formats are supported?
Input: MP4, MOV, WebM, MKV, AVI, and most common video containers. Output: MP4 (H.264 + AAC) by default, with options for MOV and WebM.
Can I trim multiple sections from one video?
Not in a single export — for multi-section edits, trim each section separately, then use the Video Merger to concatenate. We may add multi-range trim in a future update.
What's the maximum file length?
There's no hard limit. Practical ceiling is browser memory: laptops handle 1–2 hour videos, phones cap around 30 minutes.
Does scrubbing the timeline use bandwidth?
No — once the video is loaded into the page, all scrubbing is local. The video never leaves your device.
Why are some frames marked brighter on the timeline?
Those are keyframes (I-frames). Trimming on a keyframe is byte-exact and completes in seconds. Snap your in/out points to keyframes when speed matters more than precision.

Related Tools on UDT

Video Compressor →
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Video Merger →
Concatenate multiple videos into one — no re-encode when codecs match.
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