Convert video — right in your browser
Drop in a .mov, .mkv, .webm, .avi — or whatever you've got. Compress to an exact file size, convert, trim, pull out the audio, make a GIF. Nothing uploads. No signup, no watermarks, no quotas.
//Tools
Video editor
A real timeline: cut, join, add text and music, crossfade, export MP4. No upload, no watermark.
Convert format
MP4, MOV, MKV, WebM, AVI, GIF, MP3, WAV, FLAC, Opus — pick input, pick output.
Compress video
Ask for 10 MB and get under 10 MB, or just pick a quality level.
Trim clip
Cut the start, cut the end. Lossless when possible, accurate when not.
Extract audio
Pull the soundtrack out as MP3, WAV, FLAC, or Opus.
Extract frames
One frame per second, every frame, or grab a single thumbnail at a timestamp.
Video to GIF
Make a clean, palette-optimized GIF from any clip.
Merge clips
Concatenate two or more videos into one. Same format goes fast; mixed formats re-encode.
Resize
1080p, 720p, 480p, or a custom size. Keep aspect ratio or stretch.
Rotate & flip
Fix sideways phone videos. 90°, 180°, mirror horizontally or vertically.
Change speed
Slow-motion or speed-up. Audio retunes with the video.
Burn subtitles
Hard-code an .srt file into the video so it plays anywhere.
Transcribe to text
Speech to text on your own device. English audio, nothing uploaded.
Generate subtitles
Make an .srt from the speech in a video, in the browser.
Compress MP4
Shrink an MP4 to a target size, keeping it an MP4.
GIF to MP4
Turn a GIF into a video — far smaller, and it plays anywhere.
How it works
Why converting without uploading is possible at all.
Mute / strip audio
Remove the soundtrack and re-export.
//Format-specific
MOV → MP4
The iPhone-to-everything-else conversion.
MKV → MP4
Open MKV anywhere — including phones.
WebM → MP4
Twitter, Discord, and Premiere-friendly.
AVI → MP4
Modernize an old AVI file in one click.
MP4 → MP3
Pull just the audio out of any video.
MP4 → GIF
Make a shareable GIF without uploading.
HEVC → H.264
iPhone / GoPro 10-bit fix for Premiere & Resolve.
ProRes → MP4
Editor master to shareable delivery file.
MTS / M2TS → MP4
AVCHD camcorder footage to universal MP4.
TS → MP4
DVR / IPTV transport streams to MP4.
VOB → MP4
DVD home video archives.
FLV → MP4
Old Flash video archives.
WMV → MP4
Windows Media to universal MP4.
OBS MKV remux
Stream-copy, no quality loss, instant.
//Use cases
Compress for Discord
Fit the 10, 25 or 500 MB upload cap.
Compress for WhatsApp
16 MB Status / 100 MB chat.
Compress for email
Gmail 25 MB / Outlook 20 MB.
iPhone screen recording
Shrink huge iOS .mov files.
4K to 1080p
Downscale for size and editing speed.
iPhone ringtone (M4R)
Trim 40s, export AAC ringtone.
VFR → CFR
Fix variable framerate for Premiere & Resolve.
10-bit → 8-bit
Fix HEVC import errors in editors.
//Why ShrinkVideo?
No uploads, ever
Your video is read by WebAssembly inside your browser. The bytes never leave the tab.
Works offline
After the first conversion the converter is stored on your device, so it keeps working with no connection.
No limits
No quotas, no daily caps, no signup, no waiting in a queue. Only your RAM matters.
Exact file sizes
Ask for 10 MB and get a file under 10 MB. The tool measures the clip and works out the bitrate for you.
//FAQ
Do my videos actually stay on my device?
Yes. Every operation runs in WebAssembly inside your browser, and no part of your file is ever sent anywhere. Open your browser's network tab while you convert and you will see nothing uploaded.
Which formats does ShrinkVideo support?
Read: MP4, MOV, MKV, WebM, AVI, FLV, WMV, 3GP, MTS, M2TS, TS, VOB, OGV. Write: MP4 (H.264), MKV, MOV, WebM (VP8), GIF, and audio as MP3, M4A, WAV, FLAC or Opus.
How big a video can I convert?
Roughly your tab's available memory. WebAssembly is capped at 2–4 GB per file. Most 1080p videos under a gigabyte work fine on a laptop. Multi-gigabyte 4K should use a desktop FFmpeg.
Is there a watermark?
No. No watermark, no signup, no “upgrade to remove” nag.
How fast is it?
Converting uses your CPU through WebAssembly, so expect seconds for a short clip and minutes for a long one. Jobs that only repackage the file rather than re-encode it — trimming on a keyframe, muting, or an MKV to MP4 remux — finish almost instantly.
Why is it free?
The site is supported by unobtrusive ads. There's no server doing the conversion, so running it is mostly the cost of static hosting.
Does it work on mobile?
Yes, on modern iOS, iPadOS and Android browsers. Phones have slower processors and less memory, so large files take longer and very large ones may not fit at all.