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appkiro.comDrag and drop your video file here
or click to browse
Supported formats: MP4, WebM, MKV, MOV
Max file size: 2GB
Sample video:
Select the format you want to convert to.
Higher quality results in a larger file.
Leave as Auto to use the best compatible codec.
Leave as Auto to use the best compatible codec.
Conversion happens in your browser. Your file never leaves your device.
Your converted video will appear here
Convert a video to see the result
Your files are processed locally in your browser. We do not upload or store any files.
Video Converter changes a video from one browser-supported format to another without sending the file to a server. It is useful when a clip needs to fit a CMS requirement, play in a specific browser, move into an editing workflow, or be shared in a smaller and more practical format.
The tool reads your source video, decodes the media tracks, then writes a new file as MP4, WebM, MKV, or MOV. You can keep the original resolution or choose a smaller width, frame rate, bitrate, and codec.
Editors, marketers, developers, QA teams, teachers, and support teams can use it when they need a quick format change without opening desktop video software.
Use it before uploading a clip to a website, attaching a video to a ticket, testing browser playback, reducing a rough cut, or preparing a sample file for a teammate.
Local files stay in your browser. URL mode also runs locally, but the remote server must allow CORS and Range requests so the browser can read the media safely.
Format, codec, resolution, frame rate, and bitrate affect playback compatibility, visual quality, output size, transparency support, and how long conversion takes.
Start with MP4 and High quality for general use. Switch to WebM when web delivery or transparent VP9 output matters. Lower the width or bitrate when file size is the priority.
MP4 is the most practical default for sharing, websites, phones, and office apps. WebM is efficient for modern web pages and can support transparent VP9 output. MKV is flexible for internal archives and technical workflows. MOV is common when the next step is an editing or media production app.
After conversion, the result appears in the preview area when the browser can play that format. The Download Video button saves the generated file with the source name and new extension. The original file is not modified, renamed, compressed, watermarked, or stored by appkiro.
No. Files selected from your device are decoded and encoded in your browser. The tool only uses the network when you choose a remote URL.
A direct video URL must allow CORS and byte-range requests before browser tools can read it. Some storage buckets, CDNs, and streaming pages block that access.
MP4 is the safest default for general sharing. WebM is useful for web delivery and transparent VP9 workflows. MKV is flexible for archives, while MOV is common in editing pipelines.
Encoding depends on the browser, operating system, hardware acceleration, and the selected container. The tool checks support and reports a clear error when a combination cannot be encoded.
No. Conversion changes the container, codec, size, or bitrate, but it cannot restore detail that is missing from the source video.
A higher quality preset, higher bitrate, larger resolution, or different codec can increase file size. Use a smaller resolution or lower bitrate when size matters more than fidelity.
It can request alpha preservation for compatible outputs, mainly WebM or MKV with VP9. If the browser cannot encode that combination, the tool will ask you to choose another setting.
Local files are capped at 2 GB, but very large videos can still exhaust browser memory during encoding. For long videos, use a smaller resolution or bitrate.