CloudConvert converts files on its own servers, so your file gets uploaded. First check whether this file is allowed to leave your device. Then check which format you actually need and whether your device can do the job. Price and a file extension alone are not enough to decide.
The CloudConvert details below come from its official documentation, checked on 2026-09-11. This is not a measured comparison: the same video was not converted with both.
Match the processing location to the job
| Situation | Option to consider | Check first |
|---|---|---|
| You may not send the file to an outside service | A local app your organisation has approved | This website needs approval too. Running in a browser does not make a tool approved |
| One short video needs to become MP4 | On-device converter | The source video codec, the audio, and whether the result plays |
| A phone cannot finish the job | A desktop app, or a cloud service you are allowed to use | Memory, upload permission, price and file limits |
| A server needs to convert files automatically | CloudConvert API, or FFmpeg on your own server | Where input and output files are stored, retries, cost limits |
| Change the container but keep the video as it is | Remuxing | Whether the new container accepts the source streams |
CloudConvert’s privacy policy says the files you select are sent to its servers and stored there temporarily. That is how cloud conversion works. It does not mean the service is unsafe. For automated jobs, its API documentation explains task states and retries.
Example: changing MOV to MP4
MP4 is a container (the file type). H.264 and HEVC are video codecs (the way the picture is compressed). Renaming the file extension does not change the codec.
- If the video has to play in a particular app, check which video and audio formats that app supports. For iPhone videos, the iPhone-to-PC playback guide starts by checking that the whole file was transferred.
- If only the container needs to change, remuxing (moving the streams into a new container without re-encoding) may be enough. Remuxing does not turn HEVC into H.264.
- If you want a smaller file, use compression and check the actual output size. A different extension does not make a file smaller.
When you choose MP4, the converter re-encodes the video to H.264 and the audio to AAC. It always re-encodes, so it is not a lossless way to change only the container. WebM output uses a different setting, not H.264. Special input formats and HDR colour conversion do not always work.
A short conversion checklist
- Keep the original. Test with a short copy that contains nothing private.
- Find out which codec and container the recipient needs, then pick a tool that supports them.
- Save the result and play it in the recipient’s app. Check the length, orientation, audio and any subtitles you need.
- If it fails, find the cause in the table below before you run the same conversion again.
| Symptom | Check | Next step |
|---|---|---|
| Nothing happens after you select a file | File size limit, loading errors and free memory | Try a short video, then a suitable desktop app |
| The MP4 plays with no picture | The actual video codec, and whether the player supports it | Convert the codec. Renaming the file does not help |
| There is no sound | Audio in the source, extra audio tracks, audio in the output | Check the audio tracks |
| Colours look washed out or dark | Whether the source is HDR (high dynamic range), the display, and colour conversion | HDR-to-SDR guide |
| The output is bigger than the original | How strongly the source was already compressed, and the output settings | If you need a smaller file, adjust the compression |
Compare cost and waiting time
Check CloudConvert’s current pricing for the conversion you plan to run. Do not judge whether it is free from a monthly file count alone. Also check what your conversion needs and how it is charged.
To compare the two, record these items with your own video:
| Item | Cloud processing | This site (on your device) |
|---|---|---|
| Before conversion starts | Upload and any queue time | Loading the page and the processing program |
| Conversion | Time on the service | Time on your device |
| Getting the result | Downloading the output | Saving the output |
| Cost | What your job actually uses, and the billing terms | No fee for the tool; data and electricity are separate |
| Is the result usable? | Correct format, picture and audio | The same checks |
Skipping the upload does not always make the whole job faster. If your device converts slowly, the total can take longer. This site has no API for converting videos remotely.
What on-device processing does not erase
The converter does not upload the videos you select. Loading the page and the processing program still uses the network. The website and its CDN (the service that delivers its files) still keep access logs. Your download history, browser extensions and cloud-synced save folders work as usual.
CloudConvert’s rules for deleting files and for keeping access logs are separate. For confidential or contract-bound material, read its current policy and get your administrator’s approval. Using this site does not by itself make you compliant with a law or contract.
Converting a video does not hide faces, voices, documents in the picture or location tags. For location tags, see checking and removing video location data.