How to Convert to MP4 on Windows & Mac
Updated August 31, 2026
MP4 is the format that just works: TVs, phones, editors, upload forms, all of it. So whenever a video refuses to play somewhere, converting it to MP4 is the usual fix, whether it started life as a MOV from an iPhone, an MKV from OBS, a WEBM from a browser recorder, or an AVI from an old camera.
This guide covers all of them with one tool. ConvertSave converts locally on Windows and Mac, no uploads, which matters when video files are measured in gigabytes.
How to convert any video to MP4
- 1
Drag your files into ConvertSave
Open ConvertSave and drag your video files into the window. You can drop one file or a whole selection at once. There is no upload step, because the files never leave your computer.
- 2
Choose MP4 as the output format
Pick MP4 from the format list. ConvertSave shows the formats that make sense for the files you dropped, so MP4 is right there.
- 3
Click Convert
Hit the Convert button. Each MP4 file is saved next to the original, so you don't have to hunt through folders to find your converted files. The originals are left untouched.
Mixed sources are fine. The screenshots show a MOV, an MKV, and a WEBM going to MP4 in a single batch.
Which formats convert to MP4?
MOV, MKV, WEBM, and AVI are the common ones, and each has its own guide with format-specific notes: see MOV to MP4, MKV to MP4, WEBM to MP4, and AVI to MP4. The quality, resolution, and frame rate of the conversion are adjustable in the advanced panel if the defaults aren't what you want.
How to convert to MP4 on Windows
Drag the videos in, pick MP4, convert. Each MP4 is saved next to its source file on your PC, and the originals stay untouched.
How to convert to MP4 for free
ConvertSave's 7-day trial is free and fully unlocked. For video specifically, local conversion has a second advantage over the free websites: no waiting for a multi-gigabyte upload before the conversion even starts.
Batch converting to MP4
Queue a whole folder of mixed videos and convert them in one go. We've tested batches of up to a thousand files.
Is converting to MP4 safe?
The risk with converting your videos to MP4 isn't the conversion itself, it's where the conversion happens. Free converter websites work by uploading your file to someone else's server. You usually can't tell who runs the server, where it is, or how long your file sticks around after the conversion finishes. For personal videos and photos that's a real privacy trade, and it's the reason so many of those sites are covered in aggressive ads.
ConvertSave does the conversion on your own computer. Nothing is uploaded anywhere. You can turn off Wi-Fi entirely and it still works, which is also the easy way to verify the claim. Your original file is never modified, and the converted copy is written right next to it.
Frequently asked questions
Does converting to MP4 lose quality?
At the defaults the difference isn't visible in normal viewing, and the advanced panel gives you a quality slider plus resolution and frame rate controls when you want to decide yourself.
Can I convert several different formats at once?
Yes. MOV, MKV, WEBM, and AVI can sit in the same queue and all come out as MP4s in one pass.
Why MP4 rather than MOV or MKV?
Compatibility. MOV is happiest on Apple devices and MKV needs the right player, but MP4 plays on effectively everything, which is why it's the safe format for sharing.
Do my videos get uploaded anywhere?
No. Conversion runs on your computer and works offline, which for large videos is also simply faster than any upload-based site.
Is ConvertSave free?
There's a 7-day free trial with all features unlocked. After that it's $9/month, $60/year, or $129 once for a lifetime license that covers 3 personal devices on Mac and Windows.
