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tools / video-trimmer

Cut a video to the exact frame.

Drag the handles, preview the selection, export MP4 or WebM. Everything is encoded in your browser and checked before you download.

video_fileOpen videoplay_circleTest cliptest-clip.mp4 · 1280×720 · 0:06.00

opens→saves

.mp4.webm.mov.ogg.mkv.avi

content_cut

.mp4H.264 + AAC.webmVP9 + Opus

HighCRF 18

MediumCRF 23

LowCRF 28

play_arrowPlay selectionfirst_pageStart herelast_pageEnd herechevron_leftchevron_right0:01.00

0:00.00Drag the purple handles · click to move the playhead0:06.00

start0:01.00

end0:04.00

length0:03.00

format

MP4 · H.264 + AACWebM · VP9 + Opus

quality

High · CRF 18Medium · CRF 23Low · CRF 28

frame rate

24 fps30 fps60 fps

size

original 720p1080p720p

sound

keepremove

About 856.9 KB at 1280×720. 90 frames to encode.

content_cutExport 0:03.00 clip

Your clip, checked

radio_button_uncheckedExport a clip to see it checked here

downloadNothing exported yet

~/format-and-quality

Six exports of your selection, measured.

MP4 is encoded as H.264 with AAC sound, WebM as VP9 with Opus. High, Medium and Low set the bitrate per pixel, which plays the same role as ffmpeg's CRF 18, 23 and 28: more bits keep more detail. The test encodes two seconds from your selection at 640 px wide in all six combinations, decodes each one again and compares the middle frame with the source.

-encoded and decoded

-smallest 2 s

-best middle frame

Two seconds from the start of your selection, six times.scienceMeasure all six

format · qualitybitratesize for 2 sper minutemiddle frame

MP4 · HighH.264 + AAC · CRF 181.04 Mb/snot run--

MP4 · MediumH.264 + AAC · CRF 230.55 Mb/snot run--

MP4 · LowH.264 + AAC · CRF 280.31 Mb/snot run--

WebM · HighVP9 + Opus · CRF 181.04 Mb/snot run--

WebM · MediumVP9 + Opus · CRF 230.55 Mb/snot run--

WebM · LowVP9 + Opus · CRF 280.31 Mb/snot run--

Which settings for what

publicPosting to social mediaMP4 · MediumH.264 plays everywhere, and Medium keeps the upload quick while still looking clean on a phone.click to use these settings

movie_editKeeping it to edit laterMP4 · HighHigh stays close to the source, so you lose little detail when you import it into another editor.click to use these settings

languageEmbedding on a websiteWebM · MediumVP9 and Opus give similar picture quality to MP4 in a smaller file, so the page loads faster.click to use these settings

chatSending in a chatMP4 · LowLow plus a tight selection keeps the clip under typical messaging limits.click to use these settings

~/exact-or-fast

Why a fast cut starts early.

Video stores a full picture only at keyframes; the frames between are changes. A cut without re-encoding has to begin on a keyframe. This page re-encodes, so the clip starts on your exact frame.

Your selection starts at 0:01.00

keyframe every0.5 s1 s2 s4 s

source

fast cut

exact cut

0:00.000:01.000:02.000:03.000:04.00

0:00.00nearest keyframe before your start

+1.00 sextra at the start of a fast cut (30 frames)

0 framesextra in the exact cut

90 framesthe exact cut re-encodes

Fast, no re-encode

Instant and lossless, but starts at the keyframe before 0:01.00.ffmpeg -ss 00:00:01.000 -to 00:00:04.000 -i "test-clip.mp4" -c copy "test-clip-trim.mp4"

Exact, re-encoded

What this page does: starts on your frame, small quality loss.

ffmpeg -ss 00:00:01.000 -i "test-clip.mp4" -t 3.000 -c:v libx264 -crf 20 -preset medium -c:a aac -b:a 128k -movflags +faststart "test-clip-trim.mp4"

Exact, keep original quality

Starts on your frame at near-source quality; a large file for further editing.ffmpeg -ss 00:00:01.000 -i "test-clip.mp4" -t 3.000 -c:v libx264 -crf 12 -c:a copy "test-clip-trim.mp4"

compressVideo compressorMake the trimmed clip fit an upload limit.clip.mp4 · 48 MB → clip.mp4 · 9.6 MB gifVideo to GIFTurn a short trimmed moment into a looping GIF.clip.mp4 → clip.gif movie_editVideo editorLayer clips, text and music on a timeline.3 clips → edit.mp4 searchMP4 format referenceOpen the exported file: moov position, keyframes, codec string.clip-trim.mp4 → ftyp · moov · mdat