Convert MOV to MP4 in your browser

Choose a MOV, WEBM or MKV file, pick a quality, and download an MP4 that plays everywhere.

Free, no sign upNo watermarkNothing is uploadedMOV, WEBM, MKV

Quality

How it works

  1. Step 1

    Choose a video

    MOV, WEBM, MKV or MP4, up to 250 MB and 10 minutes.

  2. Step 2

    Pick a quality

    Balanced suits most videos; High keeps more detail in a bigger file.

  3. Step 3

    Convert and download

    Play the MP4 on the page, then save it.

MOV, WEBM and MP4

MOV, WEBM, MKV and MP4 are containers: boxes that hold a video stream and a sound stream. What decides whether a file plays is what is inside. The converter writes H.264 video and AAC sound in an MP4, the combination phones, browsers and editors most widely support.

QualitySetting (CRF)Use it for
High18Footage you will edit further, or detail you want kept
Balanced23Most videos, the FFmpeg default
Smaller file28Sharing and messaging, where size matters more

Private by design

The converter runs FFmpeg compiled to WebAssembly in your browser. Your file is read into memory on your device and the result is saved from there, so nothing is sent to Percify or anyone else. That is also why there is no queue, no account and no watermark.

Files up to 250 MB and 10 minutes work in the browser. For bigger files, the free FFmpeg command on this page does the same job on your computer.

Platform facts checked on 17 September 2026 against each platform's own help pages.

Use it from an AI assistant or a script

Every setting is a URL parameter, so an assistant can send a link with the options already chosen. The tool still runs on the person's own device.

ParameterValuesDefaultMeaning
quality18, 23, 2823H.264 CRF: lower is higher quality and a bigger file.

Convert keeping more detail

https://percify.io/tool/mov-to-mp4?quality=18ffmpeg -i input.mp4 -map 0:v:0 -map "0:a:0?" -c:v libx264 -preset ultrafast -crf 18 -pix_fmt yuv420p -c:a aac -b:a 192k -movflags +faststart output.mp4

Convert to a smaller file

https://percify.io/tool/mov-to-mp4?quality=28ffmpeg -i input.mp4 -map 0:v:0 -map "0:a:0?" -c:v libx264 -preset ultrafast -crf 28 -pix_fmt yuv420p -c:a aac -b:a 192k -movflags +faststart output.mp4

Every free tool and its parameters, as JSON: percify.io/tools.json

More free tools

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Frequently asked questions

Everything you need to know before you start.

Choose the MOV file, pick a quality, press Convert to MP4, and download. It works the same way for WEBM and MKV.

The video is encoded again, so a little. Balanced is hard to tell apart from the original for most footage; High keeps more detail in a bigger file.

The file may use a codec those players do not support. Converting to H.264 video with AAC sound in an MP4 is the most widely supported combination.

No. It is processed on your device with FFmpeg running in WebAssembly and saved from there. Only the converter itself is downloaded, once, and checked against a fingerprint before it runs.

Yes. The quality is a URL parameter, for example /tool/mov-to-mp4?quality=18, and /tools.json lists every tool and its parameters.