Key takeaways
- For almost every short clip you plan to share, MP4 with H.264 video and AAC audio is the safest choice. It plays on practically every phone, computer, browser and editor.
- A file extension names the container. The codec inside decides quality, size and compatibility.
- MOV suits Apple and editing workflows. WebM suits web pages. GIF is rarely the best answer today.
- You can often change container without re-encoding, which keeps quality exactly as it was.
"Which video format should I use?" is one of those questions where the honest answer is "it depends, but for most people it is MP4." The details are worth knowing, though, because they explain why a video that plays on one device will not play on another, and why a GIF of a five-second clip can be bigger than the whole video. This guide compares the four formats you meet most often with short clips.
Container versus codec
People use "format" for two different things. A container is the box: it holds a video stream, one or more audio streams, subtitles and metadata. Common containers are MP4, MOV, WebM and MKV. A codec is how the video or audio inside is compressed: H.264, HEVC (H.265), VP9 and AV1 for video; AAC, MP3 and Opus for audio.
So "MP4" tells you the box, not the contents. Most MP4s contain H.264 video and AAC audio, which is why they play almost everywhere. But an MP4 can also hold HEVC or AV1 video, which older devices may not decode. When a file "will not play," the codec is usually the issue rather than the extension.
The four formats side by side
| Format | Typical contents | Strengths | Weaknesses |
|---|---|---|---|
| MP4 | H.264 + AAC (also HEVC, AV1) | Plays nearly everywhere; good quality for the size; well supported by editors, browsers and social platforms | Newer codecs inside may not play on old devices |
| MOV | H.264, HEVC, ProRes + AAC or PCM | Native to Apple tools; supports professional codecs for editing | Large files with professional codecs; less universal outside Apple software |
| WebM | VP8, VP9 or AV1 + Opus or Vorbis | Open format; efficient; good for web pages in modern browsers | Not accepted everywhere, and older Apple devices have had limited support |
| GIF | Looping frames, 256 colours, no sound | Plays automatically almost anywhere an image can go | Large files, poor colour, no audio, low frame rates |
When MP4 is the right answer
Choose MP4 with H.264 and AAC when you want a clip to play on the widest range of devices: sharing by message or email, uploading to social platforms, embedding on a website, sending to a client, or archiving something you may open in ten years. It is also what Streamable serves, which is why our Streamable to MP4 tool does not need to convert anything: it saves the MP4 as it is.
When MOV makes sense
Modern iPhones record video in the MOV container by default, often with HEVC ("High Efficiency") video to save space. MOV is fine for editing in Final Cut Pro, iMovie or DaVinci Resolve, and for professional intermediate codecs such as ProRes, which keep maximum quality at the cost of very large files. If you are not on an Apple workflow and need to share the clip widely, converting MOV to MP4 is usually a sensible step. On iPhone, Settings > Camera > Formats lets you switch recording to "Most Compatible" (H.264) if you often share with older devices.
When WebM is worth it
WebM was designed for the web. With VP9 or AV1 inside, it can look as good as H.264 at a lower bitrate, which helps on bandwidth-sensitive pages. It is a good choice for a looping background or a short animation on your own site if you can also provide an MP4 fallback, because not every tool, editor or device handles WebM equally well. Use the <video> element with two <source> children (WebM first, MP4 second) so the browser chooses what it can play.
The truth about GIFs
GIF survives because it is easy: an image that moves, with no player to press play on. But the format is old, limited to 256 colours per frame, and compresses motion badly. A GIF of a few seconds is often many times larger than an MP4 of the same clip, which is why many platforms silently convert uploaded GIFs into short looping MP4 or WebM video behind the scenes. Use a GIF only where an MP4 truly will not work, for example in an environment that only accepts images. Otherwise a short looping MP4 (muted, with autoplay loop muted playsinline on the video element) gives smoother motion at a fraction of the size.
How to convert without losing quality
If the codecs inside are already compatible with the new container, you can "remux" instead of re-encode. That repackages the same data, takes seconds and changes nothing about the picture:
ffmpeg -i input.mov -c copy output.mp4This works when the MOV holds H.264 or HEVC video and AAC audio. If the command reports an error about an unsupported codec, you need to re-encode, which costs some quality:
ffmpeg -i input.mov -c:v libx264 -crf 20 -c:a aac -b:a 160k output.mp4Lower -crf means higher quality and larger files. For a GUI, HandBrake does the same job with presets.
A simple decision guide
- Sharing with other people or devices? MP4 (H.264 + AAC).
- Editing on a Mac with Final Cut or iMovie, or working with ProRes? MOV.
- Serving a short clip on your own web page and want smaller files? WebM with an MP4 fallback.
- Need a tiny silent loop in a place that only accepts images? GIF, with the colour and size limits in mind.
- Just need the sound? Pull out the audio; see how to extract audio from an MP4.
Related reading
If the file is too big for where it needs to go, read how to compress a video to fit a size limit. To see which codec a file uses, see how to check a video's resolution, bitrate and codec.
Quick answers
Is MP4 better quality than MOV?
Not inherently. Quality depends on the codec and bitrate inside the file, not on the container. A MOV and an MP4 holding the same H.264 stream look identical.
Why will my MP4 not play on an old TV or phone?
It probably holds a codec such as HEVC or AV1 that the device cannot decode. Re-encode to H.264 with AAC audio for maximum compatibility.
Should I convert my video to GIF to post it?
Usually not. Most places that accept GIFs also accept short MP4 videos, which are smaller and look better.
Need to save a Streamable clip? Paste its link into the free Streamable downloader and get the original MP4 in a few seconds. Only download videos you own or have permission to keep: see our copyright basics guide.