Step 1: Provide your AIFF files using the button above or by toss and let go.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Fetch your converted MKV files.
AIFF to MKV Conversion FAQ
How do I convert an AIFF file to MKV?
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Upload your AIFF file using the picker above and the converter detects the source type and runs the AIFF -> MKV pipeline. The result downloads automatically when conversion completes; no account is needed for one-off conversions. AIFF is Apple’s Audio Interchange File Format from 1988, built on the same IFF chunk design as AVI’s RIFF. MKV is Matroska, an open container designed in 2002 with no licensing restrictions and no ceiling on what it can hold.
What will the picture be if I put AIFF audio into an MKV file?
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You choose it, because audio alone has no picture. The default is a static waveform render, and you can supply a still image instead — cover art, a title card, a photo — which is held for the whole duration. That is what makes the file uploadable to video-only platforms that will not accept a bare audio track. MKV is the archival container of choice because it stores unlimited audio tracks, soft subtitles, chapter markers and cover art in one file.
Is the AIFF audio re-encoded when it goes into the MKV?
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Only if it has to be. Where the MKV container accepts the source audio codec directly, the stream is copied in untouched and stays bit-identical. Where it does not, the audio is transcoded once to whatever MKV does accept, at a bitrate matched to the source so the second pass costs as little as possible. AIFF stores uncompressed big-endian PCM — the Apple-side equivalent of WAV, with the same bit-for-bit fidelity. MKV is codec-agnostic: H.264, HEVC, VP9 and AV1 video sit happily beside AAC, FLAC, Opus, DTS or Dolby audio in the same file.
My AIFF is lossless — does putting it in an MKV throw that away?
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It usually does, because video containers expect a compressed audio track and most players will not accept raw PCM inside one. The audio is encoded once, at a high bitrate so the loss is inaudible, and the lossless AIFF stays untouched on your side. Keep it: it remains the master, and the MKV is a delivery copy. AIFF is the studio interchange format on macOS, handles metadata better than plain WAV, and imports into Logic and Pro Tools instantly.
How large will the MKV be compared with the AIFF?
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Barely larger, if you use the default still image. A single held frame compresses to almost nothing across the whole duration because every frame is identical to the last, so the file is dominated by the audio track. Choosing an animated waveform instead adds real video data and can double or triple the result.
Do the artist and album tags on my AIFF survive into the MKV?
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Partially. Title and artist map onto the video container’s own metadata fields, and embedded cover art is a natural fit for the still image the video displays. Everything else — track number, album, year, genre — has no equivalent slot in a video file and is dropped rather than approximated.
Will a surround mix in the AIFF stay surround inside the MKV?
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Yes — MKV carries multichannel audio properly, so a 5.1 mix stays 5.1 with the channel layout intact rather than being folded to stereo. That matters if the file is destined for a home cinema receiver rather than a phone, which will downmix at playback time anyway.
Is the AIFF to MKV converter free?
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Yes — basic AIFF -> MKV conversion is free with no registration. Premium adds higher per-file size limits, more parallel batch workers, and removes ads.
How big an AIFF file can I convert to MKV?
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Free accounts: up to 100 MB per AIFF file. Premium: typically 1 GB per file, depending on the AIFF source type. Very large files get split into chunks server-side when the MKV format permits.
Will conversion change the content of my AIFF?
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Conversion preserves every piece of information that both AIFF and MKV can represent. Features the MKV format cannot store (vector data in raster output, formulas in plain-text output, embedded fonts in image output) are rasterized or stripped — the result page flags any feature loss explicitly.
Can I convert many AIFF files to MKV at once?
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Yes — drop multiple AIFF files into the upload zone and they queue in parallel. Premium has more parallel workers; on a 50-file batch this is the difference between minutes and seconds.
Does the AIFF to MKV converter work on phones / tablets?
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Yes — the UI is responsive and the conversion pipeline runs server-side, so mobile devices upload-then-download just like desktops. iOS and Android browser file pickers (camera roll, Files app) work end-to-end without an app.
