Free online HEIF to MKV converter

Convert HEIF photos into timed MKV video frames or a slideshow.

Convert HEIF to MKV online - free

.heif .mkv

Drop up to 3 .HEIF files here or click to browse

Max 10 MB per file · No registration required · max 30 MB total

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How it works

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How to convert heif to mkv file

November 15, 2026
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Some video players, editing workflows, and MKV-based archives accept MKV files but cannot open HEIF photos. Converting a still image creates a video track that displays the image for a chosen duration; multiple images can be made into a slideshow.

What the HEIF format is

HEIF (High Efficiency Image File Format) stores still images, commonly using HEVC compression; files often use the .heif or .heic extension. iPhones and some other cameras create HEIF photos, which can also be exported by image-editing and photo-management programs.

What the MKV format is

MKV, or Matroska, is a container for video, audio, subtitles, and metadata. It can hold video encoded with different codecs, so compatibility depends on both the MKV container and the codecs supported by the playback software. For an image conversion, MKV holds a video stream showing the image for a set time; it does not turn the photo into moving footage.

How to convert HEIF to MKV

Online on 101convert.com

Open the HEIF-to-MKV converter on 101convert.com and add your file. You can add several files for batch conversion; the page shows the per-file size limit.
Set show each picture for to choose how long each image appears.
Start the conversion and download the MKV output.

Offline with desktop software

FFmpeg is a free, open-source command-line tool for Windows, macOS, and Linux. Use a build that can decode HEIF and encode H.264. This command creates a five-second video from one image:

ffmpeg -loop 1 -framerate 25 -i input.heif -t 5 -c:v libx264 -crf 18 -pix_fmt yuv420p output.mkv

Replace input.heif with the source filename and change -t 5 to the desired duration in seconds. For a .heic file, use its actual filename in the command. If FFmpeg reports that it cannot decode the input, install a build with HEIF support.

Quality and limitations

A still photo has no motion or audio, so the result is a static video unless you combine multiple images. The example encodes with H.264, which is lossy; -crf 18 favors quality over file size. The yuv420p setting improves playback compatibility but can reduce color detail, and conversion may not preserve HEIF-specific metadata or auxiliary image data.

Note: This heif to mkv conversion record is incomplete, must be verified, and may contain inaccuracies. Please vote below whether you found this information helpful or not.

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HEIF vs MKV: format comparison

How the HEIF and MKV formats compare on the properties that matter most for this conversion.

Comparison of the HEIF and MKV file formats
Property	.HEIF High Efficiency Image File Format	.MKV Matroska Video
Open standard	Yes	Yes
Compression	Both	Both
Typical file size	Small	Large
Opens in a web browser	Partial	No
Further editing	Limited	Limited
Metadata support	Extensive	Extensive
Plain-text readable	No	No
Best used for	Photographs	Streaming
Introduced	2015	2002
Developer	Moving Picture Experts Group (MPEG)	Matroska org
MIME type	image/heif	video/x-matroska

Open HEIF file Open MKV file

Information about file extensions and file types is provided by File-Extensions.org

Frequently asked questions

Is the HEIF to MKV converter free?

Yes, converting HEIF to MKV on 101convert.com is completely free. No registration, email address or installation is required. If you need a higher file size limit or want to convert more files at once, see our plans.

How large can my HEIF file be?

You can upload HEIF files up to 10 MB and convert up to 3 files at once in a single batch. With a paid plan the limit is up to 2000 MB per file and 20 files at once, see our plans.

What happens to my uploaded files?

Files are processed automatically and deleted from our servers within a few minutes after conversion. We never view or share your files.

Do I need to install any software to convert HEIF to MKV?

No. The HEIF to MKV conversion runs entirely online in your browser and works on Windows, Mac, Linux, Android and iPhone.

Did the conversion fail?

In most cases, the cause is an incorrect file format. Please upload a valid HEIF file for this HEIF to MKV conversion. Occasionally, the issue may be on our side. We analyze recurring conversion failures and disable or fix the converter if we detect a defect.

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heif file conversion

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