Video Converter
A video file is a container holding separately compressed video and audio streams. Converting between containers sometimes means only repackaging those streams; more often it means decoding and re-encoding them, which is why video conversion takes real time.
FileTools360 runs FFmpeg compiled to WebAssembly directly in your browser. It is the same engine most video tooling is built on, so the results match what you would get on the command line — without your footage leaving your device.
Most used video converters
Video tools
Operations that change a file without changing its format.
Compress Video
Cut video file size down with H.264 while keeping it watchable.
Open toolTrim Video
Keep just the section you need by start and end timestamp.
Open toolMerge Videos
Join several clips into one continuous video, in the order you arrange them.
Open toolExtract Audio from Video
Pull the soundtrack out of any video as an MP3.
Open toolRemove Audio from Video
Strip the audio track and keep the picture untouched.
Open toolVideo to Images
Export frames as individual images, at an interval or a fixed count.
Open toolGenerate Video Thumbnail
Grab a single poster frame — by default from 10% into the clip.
Open toolAll video conversions
142 supported conversions. Every one is a working converter, not a placeholder.
Video formats explained
MPEG-4 Part 14
.mp4, .m4v
The default video container of the internet.
Best for: Sharing anywhere · Streaming · Social media
QuickTime Movie
.mov, .qt
Apple's QuickTime container, common from iPhones and cameras.
Best for: Apple ecosystem · Video editing
WebM Video
.webm
Open, royalty-free container built for the web.
Best for: Websites · Open-source projects · Small file sizes
Matroska Video
.mkv
Flexible container that holds any codec, subtitles and tracks.
Best for: Multi-track video · Archiving · Media servers
Audio Video Interleave
.avi
Legacy Microsoft container. Widely readable, inefficient.
Best for: Older Windows software · Legacy hardware
Flash Video
.flv
Obsolete Flash container. Convert to MP4 to keep it playable.
Best for: Recovering old archives
MPEG-1/2 Program Stream
.mpeg, .mpg, .mpe, .m1v, .m2v
Classic MPEG program stream from DVDs and camcorders.
Best for: DVD-era footage · Broadcast archives
3GPP Multimedia
.3gp, .3g2
Mobile-era container from feature phones and old Androids.
Best for: Recovering old phone recordings
MPEG Transport Stream
.ts, .m2ts, .mts
Broadcast and camcorder stream format (AVCHD).
Best for: Camcorder footage · TV recordings · HLS segments
Ogg Video
.ogv
Open Ogg container carrying Theora video.
Best for: Open-source pipelines
Windows Media Video
.wmv, .asf
Microsoft's legacy streaming container.
Best for: Old Windows archives
Containers and codecs are different things
MP4, MOV, MKV and WebM are containers. H.264, H.265, VP9 and AV1 are codecs. The container determines which players will open the file; the codec determines how the picture is compressed and how large the file is.
This is why “convert to MP4” is not a quality setting. An MP4 can hold anything from a pristine 4K master to a heavily compressed clip. What matters is the codec inside and the bitrate it was encoded at.
How to make a video smaller without ruining it
Resolution is the biggest lever by far. Dropping 4K to 1080p cuts the file to roughly a quarter before any other setting changes — and on a phone screen nobody can tell the difference.
After that, CRF (Constant Rate Factor) controls quality directly. Lower is better: 18 is visually lossless, 23 is a sensible default, 28 is noticeably soft. Each increase of about 6 roughly halves the file size.
Encoder speed trades time for size. A slower preset produces a smaller file at identical quality but takes several times longer. In a browser, 'very fast' is usually the right compromise.
Which video format should you use?
H.264 in an MP4 container is the safe default. It plays on every phone, browser, TV and editor in common use, and every platform accepts it as an upload.
WebM with VP9 produces smaller files and is ideal for video you serve on your own website, but it is poorly supported outside browsers.
MKV is the right choice for archiving films with multiple audio and subtitle tracks, and the wrong choice for sharing.
Why video conversion is slow in a browser
Re-encoding video is genuinely expensive work — every frame is decoded, scaled and compressed again. Running that through WebAssembly costs perhaps two to three times what native FFmpeg would, and it is single-threaded here for compatibility.
The trade is that your footage never leaves your machine. For clips up to a few hundred megabytes that is a good deal; for multi-gigabyte files, desktop software will be faster.
FAQ