Convert APNG to MKV Online

Convert APNG to MKV Online

An animated PNG (APNG) is a lossless animation that can carry full 24-bit color plus an 8-bit alpha channel, which makes the files large and limits where they play back. Converting to MKV wraps the animation in Matroska — a royalty-free, open container that plays in VLC, MPV, and most desktop media players — and re-encodes the frames with a real video codec, so the result is far smaller and behaves like an ordinary video. One thing to plan for: standard video has no alpha channel, so any transparent areas in the APNG are flattened against a background color you choose during conversion.

How to Convert APNG to MKV

1. Upload Your APNG File: Drag and drop your .apng file onto the page or click "Upload." You can add several APNG files at once.
2. Choose a Merge Strategy: Pick "Merge images" to stitch multiple uploads into a single MKV, or "Video per image" to get one MKV for each file.
3. Set Background Color, Duration, and Quality: Because video has no transparency, set the Background Color (default Black) that fills any transparent pixels. Adjust Image Duration (default 5 seconds per frame) for still frames, and pick a Quality Preset such as "Very High (Recommended)." Optionally change Video Resolution from "Keep original."
4. Convert and Download: Click "Convert" and save your MKV. No sign-up, no watermark.

APNG vs MKV: What Changes in the Conversion

For the most universally playable result — phones, social platforms, and hardware players — convert APNG to MP4 instead; H.264 in an MP4 container has the widest device support. Choose MKV when you want an open container or plan to add extra audio and subtitle tracks later.

Frequently Asked Questions

Why does my MKV lose the transparent background from the APNG?

Standard video codecs in an MKV have no alpha channel, so transparency cannot be carried over. During conversion the transparent pixels are filled with the Background Color you select (Black by default). If keeping true transparency matters, an animated image format like GIF or WebM with alpha is a better target than video.

Should I convert APNG to MKV or MP4?

MKV is an open, flexible container that is great for desktop and open-source players like VLC and Kodi, and it can hold multiple audio and subtitle tracks. MP4 with H.264 is the more universal choice if you need playback on phones, smart TVs, or social platforms. For maximum compatibility, convert APNG to MP4 instead.

How does the merge strategy affect the output?

"Merge images" combines all your uploaded APNG files into a single MKV in upload order, which is useful for chaining short clips together. "Video per image" keeps them separate and produces one MKV per file. The frame timing within each APNG is preserved either way.

Will the MKV be smaller than the original APNG?

Usually yes, often dramatically. APNG stores frames losslessly, so files grow quickly with resolution and frame count. Re-encoding to a video codec applies temporal compression, so the MKV is typically a fraction of the source size at the "Very High" preset. In our testing, a 512x512 APNG of about 6 MB produced an MKV well under 1 MB at the recommended quality.

Is the conversion private?

Yes. Files are uploaded over an encrypted (TLS) connection, processed on our servers, and deleted automatically after a few hours. There is no sign-up, no watermark, and your files are never shared or made public.