Convert MKV to MP4 in Seconds

MKV not playing where you need it? Profi PDF converts it to MP4 instantly — universally compatible, free, and right in your browser.

Instant MKV to MP4

No Signup Required

Works on Any Device

1.5M users

14,382 reviews

Drop your files here

Size up to 1024 MB

How It Works

Three steps. No installs. Done in minutes.

Upload Your MKV. Drag your MKV file into Profi PDF. Big files, multiple audio tracks, subtitles baked in — we handle it all without complaining.

Profi PDF Converts It. Our engine remuxes your MKV into a clean MP4 container in seconds. High quality, fast, no fuss.

Download Your MP4. Hit download and you are done. Your MP4 plays on any phone, TV, browser, or video editor — no more compatibility drama.

Your Complete Audio & Video Toolkit

Transcribe, convert, extract — everything audio & video, handled in one place.

AI Transcription

Speech to text with speaker labels, timestamps, and 95%+ accuracy.

Format Conversion

MP3, WAV, M4A, OGG, FLAC — convert any audio or video format instantly.

Video to Audio

Extract audio from MP4, YouTube, Zoom recordings, and more.

Lightning Fast

Most files processed in under three minutes. No waiting around.

No Signup

Start instantly

100% Secure

Auto-deleted

Browser-Based

No installs

People Love These Tools

Podcasters, researchers, marketers, and remote teams use our audio & video tools every day.

Feb 12

Finally plays on my TV

Had a bunch of MKV movies that my Smart TV refused to play. Profi PDF converted them all to MP4 and now everything works perfectly. Took like 5 minutes total.

Marco Bianchi

Jan 28

Zero quality loss, seriously

Was worried about losing quality converting a 4K MKV. Profi PDF remuxed it perfectly — same sharpness, same audio. Couldn't tell the difference.

Hannah Steele

Feb 5

Cleanest free converter I found

No watermarks, no ads, no email required. Profi PDF just converts and lets you download. Refreshing compared to every other site out there.

Raj Mehta

2468 people converted files today

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4 mins ago

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8 mins ago

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5 mins ago

Trusted and Secured by Industry Experts

Why People Pick Our Audio & Video Tools

Plays Literally Everywhere

MKV is great but not universal. MP4 works on iPhones, Android, Smart TVs, YouTube, and every video editor out there. Profi PDF gets you there fast.

No Quality Loss

Profi PDF remuxes your video without re-encoding when possible, so the picture and audio quality stay exactly as they were in the original MKV.

Handles Big Files

MKV files can be massive — full movies, multi-episode rips, 4K footage. Profi PDF chews through large files without choking your browser.

Batch Convert

Got a whole folder of MKVs to convert? Profi PDF lets you queue them up and knock them out one after another. No repetitive uploading.

Transcribe the Audio After

Once you have your MP4, run it through Profi PDF AI transcription to pull out subtitles, captions, or a full text transcript. One platform, full workflow.

Encrypted & Auto-Deleted

Your video is encrypted on upload and wiped from Profi PDF servers the moment conversion is done. Zero data stored, zero risk.

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Frequently Asked Questions

Quick answers about our audio & video transcription and conversion tools.