Step 1: Add your AAC files using the button above or by carry and plop.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Pull your converted MKV files.
AAC to MKV Conversion FAQ
What do I actually get when I convert AAC to MKV?
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A real MKV video file whose audio track is your AAC, paired with a generated visual — a still background, the cover art, or a rendered waveform. Nothing is invented: the audio is untouched, and the picture exists only because a video container needs a video stream.
Why would I want a video of an audio file?
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Because most publishing platforms only accept video. YouTube, Instagram, TikTok and many messaging apps will not take a bare AAC, so wrapping it as MKV is the standard way to get a podcast episode, a track or a voice recording onto them.
Does the audio quality change?
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Only if the container requires it. AAC is the MP4-family lossy codec, audibly better than MP3 at the same bitrate and the default for Apple devices, and where the MKV container accepts that codec directly we copy the stream through untouched, bit for bit. Where it does not, we re-encode once at a high bitrate — audible difference is very unlikely.
Can I use my own image as the background?
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Yes — supply a still and it is held for the full duration at the video resolution you pick. If the AAC already carries embedded cover art we use that by default, and fall back to a plain background when there is none.
Can I get an animated waveform or spectrum instead?
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Yes — choose the waveform visualiser and the picture is rendered from the actual samples of your AAC, so it moves in time with the audio. It costs more encode time than a static image but performs much better as social content.
What resolution and frame rate should I choose?
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1920x1080 at 30fps is the safe default everywhere. For a static background a low frame rate is fine and keeps the file small, since nothing moves; the file size of a still-image music video is dominated by the audio, not the picture.
How long can the AAC be?
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Duration is limited by the file-size cap rather than by minutes. A static-image MKV adds very little per minute on top of the audio, so full-length podcast episodes and DJ sets convert comfortably; free accounts cover typical uploads and Pro raises the ceiling.
Will the MKV play everywhere?
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MP4 with H.264 and AAC is the universally-safe combination and what we default to. Because MKV imposes no codec restrictions and carries unlimited audio, subtitle and chapter tracks, which is why rips use it and TVs often refuse it, the container you pick determines where it plays more than the audio ever does.
Does the AAC metadata (title, artist, album) carry over?
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Tags are copied into the MKV container metadata where there is an equivalent field. Note that platforms usually ignore embedded video metadata and use the title and description you type into their own upload form.
Can I convert a batch of AAC files into videos?
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Yes — upload several and each becomes its own MKV with the same visual settings. This is how people turn a full album or a season of episodes into uploadable videos in one pass.
Will the video be flagged as low quality by the platform?
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A static image is fine — platforms judge audio-led uploads on the audio. Keep the still at the full output resolution so it is not upscaled, and prefer the waveform visualiser if you want the algorithm to see motion.
Is my AAC private during conversion?
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Yes — uploads are processed in isolated workers and deleted within minutes. Unreleased tracks and recordings are never stored, reviewed or reused. See /privacy/.
