Unlike digital photos, which are predominantly in JPEG format, there isn't a single common standard for videos. However, virtually everything - including smartphones and tablets - can play MP4 videos, and this is currently the most common format.
If you have a video, perhaps from your camcorder, digital camera or something you downloaded, that's not compatible with your phone, tablet or TV, here's how to convert that video to MP4.
How to convert a video to MP4 and other formats
Changing a video's format is easy with the right software. Fortunately, there are plenty of free apps which will do this for you. Some are easier to use than others, and some have more features such as cutting out sections, dealing with multiple audio tracks (for different languages, say) and subtitles.
To keep things simple, most allow you to choose your device, such as an iPhone, rather than asking you to pick the correct settings. However, the MP4 format is a safe choice for practically all modern devices because iPhones, Android phones and TVs will play MP4s.
If you already have some video editing software, this will be able to import video in a variety of formats and export to MP4. Obviously, you'll also be able to edit the video if you need to as well. Here are the best free video editors
There are plenty of free and paid-for video converters and they all work in a similar way. Free tools usually add on a pre-roll or post-roll advertising the software, while some will watermark your entire video or limit you to a certain length.
Just in case you have an old collection of WMA music files, here's how to convert them to MP3.
Best free video converters
Freemake is easy to use, but we've had mixed results over the years. Converted videos occasionally had out-of-synch audio or corruption across the bottom edge. At other times, they're fine. Plus, Freemake supports nVidia Cuda so if you have a compatible graphics card, the conversion process can be hugely speeded up.
It's not amazingly quick, but it does a reliable job and is fairly easy to use.
Another popular free option. This has always been reliable, but lacks an easy-to-use interface, especially if you want to convert several videos at once. But it does the job and is good if you want to delve into framerates and bitrates.
This is a limited free version of a paid-for product, and won't let you output videos in 1080p or 4K. There's no batch conversion either - those features are only in the PRO version.
Paid-for video converters
Paid-for converters such as MediaEspresso (which costs £35) don't watermark or add splashes to your video. MediaEspresso also includes support for Intel Quick Sync, nVidia Cuda and AMD APP to vastly speed up the conversion process. and can convert photos and music into the bargain.
How to convert a video to MP4 step by step
The process is similar with all converters but we're using Freemake here. Essentially you select the video you want to convert, choose a device preset or video format, give it a filename and location for the converted video and press the 'Convert' button.
Depending on the length of the video and your hardware, the conversion could take anything from a few seconds to many hours to complete.
Step 1: Download Freemake and then choose Custom installation when given the choice. Deselect the optional software when prompted, because Freemake is bundled with extra stuff that gets installed if you choose the automatic installation.
Step 2: Launch the app when prompted and click the + Video button and navigate to the video you want to convert. We've chosen an .AVI file.
Step 3: Click the 'to MP4" button at the bottom. You will see a window like the one below. You can click the ... button to choose a name and location to save the converted video. By default, it will use the same folder as the source video.
Step 4: At this point you can click the blue Convert button. But if you want to make any changes to the video, you can click the blue cog icon near the top to see a screen like this:
This allows you to change the resolution, video codec (see the next page for an explanation) plus other settings.
Click OK, the Convert to convert the video to MP4.
>> Next page: Understanding video formats