Convert one or more WEBM files to MKV using an interactive, fast, and free video converter tool.
drop your WEBM files here
Converted Files
Disclaimer:Please be aware that due to limited server storage, converted files will be automatically purged over time for optimal server performance.
Conversion Settings
Limits the number of video frames in the output. Useful for trimming videos or extracting short clips. Leave blank to convert the full video.
Limits the number of video frames in the output. Useful for trimming videos or extracting short clips. Leave blank to convert the full video.
30
Sets the number of frames per second in the output video. Higher frame rates give smoother motion but increase file size.
Sets the number of frames per second in the output video. Higher frame rates give smoother motion but increase file size.
Specifies the output video resolution. Use standard formats like 1920x1080 (Full HD) or 1280x720 (HD). Leave blank to keep the original size.
Specifies the output video resolution. Use standard formats like 1920x1080 (Full HD) or 1280x720 (HD). Leave blank to keep the original size.
Sets the output video aspect ratio. Leave as 'Original' to keep the source ratio.
Sets the output video aspect ratio. Leave as 'Original' to keep the source ratio.
2000k
Controls the video bitrate. Higher bitrate improves quality but increases file size. A good balance for HD is around 4000 kbps.
Controls the video bitrate. Higher bitrate improves quality but increases file size. A good balance for HD is around 4000 kbps.
libx264
Select the video codec to use during conversion. Use 'copy' for fast conversions without re-encoding. H.264 is widely supported.
Select the video codec to use during conversion. Use 'copy' for fast conversions without re-encoding. H.264 is widely supported.
128k
Sets the audio bitrate for the output video. Higher bitrates offer better audio quality.
Sets the audio bitrate for the output video. Higher bitrates offer better audio quality.
How to use this WEBM to MKV Converter?
Choose Files: Click 👆 on the Choose Files button and choose input WEBM files, or you may drag and drop WEBM files to the drop area. You may choose one or more video files. The chosen files are displayed with size information in the same drop area.
Conversion Settings: You may change the conversion parameters like quality 🎛, background color, etc., using the sliders, or color input buttons.
Conversion: Now you can click on the Convert button. This is where the ⛄ magic happens. Your WEBM files are sent to the server for conversion. This all happens in a lightening speed ⚡.
Output: Once the WEBMs are converted ✅ to MKVs, they appear in the download section.
Download Files: You may click 👆 on the big Download button to download ↓ all your converted MKVs, or you may download individual MKV by clicking on the respective download button.
Options: There is also a link 🔗 which you can Copy and share it using which you can download the converted MKV files.
{
"convert": "webm-mkv",
"multiple": true,
"from": "webm",
"to": "mkv",
"controls": [
{
"type": "number",
"optional": true,
"name": "vframes",
"label": "Video Frames Limit",
"range": {
"min": 1,
"max": 100000
},
"desc": "Limits the number of video frames in the output. Useful for trimming videos or extracting short clips. Leave blank to convert the full video."
},
{
"type": "dropdown",
"name": "frame_rate",
"label": "Frame Rate (fps)",
"options": [
{
"label": "15 fps",
"value": 15
},
{
"label": "24 fps (Film)",
"value": 24
},
{
"label": "30 fps (Standard)",
"value": 30
},
{
"label": "60 fps (Smooth)",
"value": 60
}
],
"defaultValue": 30,
"desc": "Sets the number of frames per second in the output video. Higher frame rates give smoother motion but increase file size."
},
{
"type": "text",
"optional": true,
"name": "resolution",
"label": "Resolution (WxH)",
"placeholder": "e.g., 1280x720",
"desc": "Specifies the output video resolution. Use standard formats like 1920x1080 (Full HD) or 1280x720 (HD). Leave blank to keep the original size."
},
{
"type": "dropdown",
"name": "aspect_ratio",
"label": "Aspect Ratio",
"options": [
{
"label": "Original",
"value": ""
},
{
"label": "4:3",
"value": "4:3"
},
{
"label": "16:9",
"value": "16:9"
},
{
"label": "1.3333",
"value": "1.3333"
},
{
"label": "1.7777",
"value": "1.7777"
}
],
"defaultValue": "",
"desc": "Sets the output video aspect ratio. Leave as 'Original' to keep the source ratio."
},
{
"type": "dropdown",
"name": "video_bitrate",
"label": "Video Bitrate",
"options": [
{
"label": "500 kbps (Low)",
"value": "500k"
},
{
"label": "1000 kbps (Standard)",
"value": "1000k"
},
{
"label": "2000 kbps (High)",
"value": "2000k"
},
{
"label": "4000 kbps (HD)",
"value": "4000k"
},
{
"label": "8000 kbps (Full HD)",
"value": "8000k"
}
],
"defaultValue": "2000k",
"desc": "Controls the video bitrate. Higher bitrate improves quality but increases file size. A good balance for HD is around 4000 kbps."
},
{
"type": "dropdown",
"name": "video_codec",
"label": "Video Codec",
"options": [
{
"label": "Copy (No Re-encode)",
"value": "copy"
},
{
"label": "libx264 (H.264)",
"value": "libx264"
},
{
"label": "libx265 (H.265)",
"value": "libx265"
},
{
"label": "vp9",
"value": "vp9"
}
],
"defaultValue": "libx264",
"desc": "Select the video codec to use during conversion. Use 'copy' for fast conversions without re-encoding. H.264 is widely supported."
},
{
"type": "dropdown",
"name": "audio_bitrate",
"label": "Audio Bitrate",
"options": [
{
"label": "96 kbps",
"value": "96k"
},
{
"label": "128 kbps (Standard)",
"value": "128k"
},
{
"label": "192 kbps",
"value": "192k"
},
{
"label": "256 kbps",
"value": "256k"
}
],
"defaultValue": "128k",
"desc": "Sets the audio bitrate for the output video. Higher bitrates offer better audio quality."
}
],
"note": "MKV is a flexible multimedia container that supports nearly any video/audio codec. This profile allows full customization of video codec, bitrate, frame rate, resolution, and audio bitrate. If 'copy' is selected for the video codec, most other video settings will be ignored because the original stream is preserved without re-encoding.",
"type": "video"
}
ConvertOnline