How to use the Video Size Reducer
- Choose the video.
- Type your target size in MB.
- Lower the resolution for small targets on long videos.
- Click Compress video and download.
How the target size is reached
The reducer divides the size you ask for by the video's length to work out how many bits each second can use, keeps a little room for audio and file overhead, and encodes at that rate. The result usually lands at 85–100% of your target.
What size is realistic?
- 1 minute at 720p: about 8–15 MB looks good.
- 1 minute at 1080p: about 15–30 MB looks good.
- If the target is too small for the length, the tool tells you the smallest size that will work.
Good to know
Compression uses H.264 (x264, "veryfast" preset) with either a quality target (CRF) or a calculated bitrate for target sizes. Audio is re-encoded to AAC. The file is never uploaded, so even private videos can be compressed safely.
Supported files
MP4, MOV, MKV, WEBM, AVI, WMV, FLV, M4V, 3GP, 3G2, MPEG, MPG, TS, MTS, M2TS, VOB, OGV, MXF, ASF, DIVX, F4V, SWF, DV, MOD, TOD, WTV, RM and RMVB video, with H.264, HEVC, VP8, VP9, MPEG-4, MPEG-2, WMV, Theora and other codecs. AV1 videos cannot be read in the browser yet. Files up to 1 GB each.
Frequently asked questions
Why is my file smaller than the target?
The tool aims slightly below your limit so the file never goes over it.
Do I have to pay or sign up to use the Video Size Reducer?
No. There is no account, no payment and no watermark. The only limit is 1 GB per file, set by what browsers can handle.
Is my file uploaded to a server?
No. The converter runs inside your browser using WebAssembly, so your file is processed on your own device and never sent to us or anyone else.
Does it work on iPhone and Android?
Yes, in Safari, Chrome and other modern mobile browsers. Short files work best on phones; for long or high-resolution videos a computer is faster.