How to convert MKV to JXL?
You can convert MKV to JPEG XL (JXL) with MConverter in three easy steps:
- Choose MKV files from your device or cloud storageAt the top of this page, drag and drop your MKVs.
Alternatively, click on the Browse box to select files with your device's file picker, or copy and paste an MKV file by pressing Ctrl+V (or ⌘+V on Mac).
MConverter can easily import MKVs from Google Drive, OneDrive, and Dropbox.
Converting a folder with MKV files to JXL is also supported: simply paste, drag and drop it, or use the ADD FOLDER button. - Click or tap on JXL from the list of target formatsYou could also use the search box at the top right to quickly find the format you need, whether it's JXL or something else.
- Get your JXL files after MConverter has finished processing themClick on DOWNLOAD ALL to save your JXLs to your default downloads folder, or select SAVE TO to choose another location.
You can also configure automatic file downloads during the conversion process or in the settings menu. When enabled, each JXL file is downloaded as soon as its conversion is complete, without waiting for the others to finish.
If supported by your device, you'll see a Share icon, allowing you to directly send converted files to other apps.
About the formats
| File extension | .mkv |
|---|---|
| Category | Video file formats |
| Developed by | Matroska |
| Mime type | video/x-matroska |
Format description
MKV files are MatrosKa Video files. Like the Russian Matryoshka doll, which contains multiple smaller dolls nested inside each other, the MKV format can contain multiple video, audio, and subtitle tracks inside a single file. This makes it convenient to have one video with a number of audio and subtitle tracks in different languages, all inside a single playable file.| File extension | .jxl |
|---|---|
| Category | Image file formats |
| Developed by | Joint Photographic Experts Group |
| Mime type | image/jxl |
Format description
JPEG XL (or JXL) is a new image format with better compression than other image formats like legacy JPEG, PNG, WebP, AVIF and others. Designed for the modern web and with professional photography in mind, JPEG XL offers a more efficient way of storing images. In addition to supporting alpha channels/transparency, lossless, progressive loading and animations, the new image format promises high speed encoding and decoding even on phones.JPEG XL has experimental support in Firefox, Chrome and other Chromium-based browsers like Edge. For now, you need to enable a feature flag for these browsers to display JXL images. Safari supports only non-animated JPEG XL images since late 2023.
MConverter’s conversions from JPEG XL to other image formats are lossless, so there is no reduction in the quality of your images.
When converting from JPG to JXL, the output quality is mathematically lossless. In all other cases, the JPEG XL image quality is kept visually lossless. Your images will look visually identical.
Common questions about converting MKV to JXL
Can MConverter make a JPEG XL animation from MKV?
Yes, MConverter lets you convert video, GIF, WebP, and AVIF into JXL animations. The conversion preserves your video's original frame rate and high resolution (visually lossless), looping indefinitely by default.
Note: Currently, the duration of the produced JPEG XL animation can be up to 5 minutes.
Note: Currently, the duration of the produced JPEG XL animation can be up to 5 minutes.
Latest conversion engine update
May 21, 2026.
View the changelog
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