Bulk Convert MKV to MP3 Online — Extract Audio in Seconds

Rip audio tracks from Matroska videos in seconds.

Drop up to 50 videos at once — no install, no sign-up required.

Drop MKV Videos Here

50 MB or 2 hours per file Up to 50 files 3 parallel conversions Html.PartialAsync("_CreditIcon", "h-3.5 w-3.5 sm:h-4 sm:w-4 text-amber-500 flex-shrink-0") 1 credit per 5 minutes

Encrypted EU Servers Auto-delete 1h

How it works

1 · Drop your videos
Drag & drop or choose MKV files. No account required on Free-paid plans unlock bigger batches, higher limits, and priority queues.
2 · We extract securely
Audio extracted on our dedicated servers. Encrypted in transit & at rest. We never store filenames-only file types & sizes for accounting.
3 · Download & auto-delete
Grab your MP3 files in seconds. Files delete automatically after 1 hour. Delete anytime after downloading with one click.

About MKV →

MKV (Matroska Video) is an open container format developed by Matroska.org, with its first stable release in December 2002. Named after Russian nesting dolls (Matryoshka), MKV can contain virtually unlimited video, audio, and subtitle tracks in any codec format. It commonly holds H.264/H.265 video with AC3, DTS, AAC, or FLAC audio—often at higher quality than streaming services. MKV supports chapters, attachments (fonts, cover art), and extensive metadata, making it the format of choice for video archivists.

Learn more: Matroska on Wikipedia

MKV's flexibility has made it the preferred format for high-quality movie encodes, Blu-ray rips, anime distribution, and personal video libraries. Many MKV files contain multiple audio tracks (different languages, commentary) and FLAC lossless audio that exceeds streaming quality. While VLC and modern media players handle MKV well, extracting audio to MP3 or WAV is often necessary for portable devices, car stereos, or uploading to services that don't accept MKV input.

About MP3 →

MP3 (MPEG-1 Audio Layer III) revolutionized digital audio when it was standardized in 1993 by the Fraunhofer Society. Using psychoacoustic compression, MP3 removes audio frequencies that humans typically cannot perceive, achieving 10:1 compression or better while maintaining excellent subjective quality. MP3 supports sample rates from 8-48 kHz and 16-bit audio. At 256 kbps, most listeners cannot distinguish MP3 from the original source in blind tests.

Learn more: MP3 on Wikipedia

MP3 remains the most universally compatible audio format, supported by every music player, smartphone, computer, and web browser. While newer codecs like AAC and Opus offer marginally better compression efficiency, MP3's ubiquitous support makes it the safest choice for sharing audio. The format's patents expired in 2017, making it completely free to use without licensing concerns.

Frequently Asked Questions

What audio quality can I expect from MKV to MP3 conversion?

Output quality depends on the source audio track in your MKV. Matroska containers often use high-quality audio codecs like AC3, DTS, AAC, or FLAC at 256-640 kbps. We extract and re-encode to MP3 at 320 kbps (maximum quality), which provides excellent quality for most uses. If the source audio is already MP3, we use stream copy for lossless extraction.

Will I lose audio quality converting MKV to MP3?

It depends on the source. If your MKV contains AAC, AC3, or DTS audio, there's a small quality loss from re-encoding. If the MKV already contains MP3 audio, we use stream copy mode for zero quality loss. For the highest quality, consider extracting to WAV first.

How long does MKV to MP3 conversion take?

Very fast. Audio extraction doesn't require video decoding, so processing time is typically just seconds even for long videos. A 2-hour movie extracts in under a minute on our servers.

What video formats are supported?

We support MKV (.mkv) Matroska container format. These can contain various video codecs (H.264, H.265/HEVC, VP9, AV1) and audio codecs (AC3, DTS, AAC, FLAC, Vorbis). The video track is discarded; only the audio is extracted.

What happens to multiple audio tracks?

MKV files often contain multiple audio tracks (different languages, commentary, etc.). By default, we extract the primary audio track. If you need a specific track, you'll need to use advanced tools to select it first.

How long can my videos be?

Duration limits depend on your plan: Guest/Free: 120 minutes (2 hour), Pro: 3000 minutes (50 hours). This accommodates everything from short clips to full movies and recordings.

Why extract audio from Matroska video?

Many use cases: Create podcasts from video recordings, extract music from anime/movie files, make ringtones from clips, archive audio from interviews, or reduce file size when you only need the audio. MP3 files are typically 95% smaller than the source video.

Is stream copy mode automatic?

Yes. When we detect the source audio is already MP3-encoded, we automatically use stream copy mode (-acodec copy) for instant, lossless extraction. No configuration needed.

What are the limits for this converter?

Tier	Max File Size	Max Files/Batch	Parallel Processing
Guest/Free	50 MB	50 files	3 at once
Pro	2048 MB	1000 files	6 at once

Note: File size limits are specific to this converter. Batch and parallel processing limits apply to all images converters site-wide. See all converter limits →

How are credits calculated for this conversion?

Cost: 1 credit per 5 minutes

How it works:

Files up to 5 minutes: 1 credit
6-10 minutes: 2 credits
11-15 minutes: 3 credits
16-20 minutes: 4 credits

Example: A 10-minute file = 2 credits. A 180-minute (3h) audiobook = 36 credits.

Why per-minute? Audio conversion time scales with content duration, not file size. Longer audio requires proportionally more processing.

What are my daily and monthly credit limits?

Credit allocations vary by account tier:

Tier	Daily Limit	Monthly Limit
Guest	100 credits/day	—
Free	100 credits/day	—
Pro	—	12,000 credits/month

Daily credits (Guest & Free tiers) reset every day at midnight UTC. Monthly credits (Pro) reset on your billing cycle date.

Note: With 1 credit per 5 minutes, video files under 5 MB cost 1 credit each. Pro users can convert 12,000 video files per month.

Answers at a Glance

Quick answers to common questions.

What's New in MKV to MP3

Latest improvements to this converter

Last updated December 16, 2025

Dec 16, 2025

Initial release of MKV to MP3 converter for high-quality audio extraction.

Need to get more done? Pro starts from $5.

1 GB files 1,000 per batch Priority queue Web + API

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