MKV to MP4 Converter
Convert Matroska video files to MP4 video online. Free, fast and private. No signup required.
How to convert MKV to MP4
- Upload your MKV file, or drag it into the box above.
- MP4 is already selected as the output format. Change it if you need something else.
- Click Convert, then download your MP4 file.
Why convert MKV to MP4?
- Your app, website or device may not open MKV files, but MP4 is the most compatible video format that works widely.
- MP4 is best for sharing, YouTube and social uploads, email.
What to expect
The video is re-encoded with widely supported codecs. Resolution and audio are kept; very long files take a little longer.
About MKV and MP4
Matroska video (MKV)
MKV is a flexible container that can hold several audio tracks and subtitles. It is popular for downloaded films.
Strengths- Multiple audio tracks and subtitles
- Handles any codec
- Many phones, TVs and web uploads don't accept it
MP4 video (MP4)
MP4 (H.264 video with AAC audio) is the most compatible video format. It plays on phones, computers, TVs and every website.
Strengths- Plays almost everywhere
- Good quality at small sizes
- Ideal for uploading and sharing
- Lossy compression
MKV vs MP4
| MKV | MP4 | |
|---|---|---|
| Full name | Matroska video | MP4 video |
| What it is | A flexible video container | The most compatible video format |
| Compression | Lossy (smaller files) | Lossy (smaller files) |
| Best for | movies, archives | sharing, YouTube and social uploads, email |
Frequently asked questions
How do I convert MKV to MP4?
Upload your MKV file, make sure MP4 is selected as the output format, and click Convert. Your MP4 file downloads in seconds. No account or software is needed.
Is this MKV to MP4 converter free?
Yes. It is completely free, with no signup, no watermark and no limit on how many files you convert.
Will I lose quality converting MKV to MP4?
The file is re-encoded at high quality, so the result looks and sounds nearly identical. Lossy formats always discard a little data, so keep the original if you need a perfect master.
Are my files safe?
Your file is processed once, in memory, to make the converted copy. It is not stored on our server or shared with anyone.
Can I convert several MKV files at once?
Yes. Drop several MKV files together and they are converted in one go. You can download them individually or as a ZIP.
What is the maximum file size?
Files up to 100 MB are supported. Larger videos and very large images may take a little longer to process.
More converters
Why QuickFix Beats the Rest
Built for speed, precision, and privacy — every time.
Instant Conversion
Files convert server-side with optimized pipelines. Most conversions complete in under 10 seconds, even for large files.
Batch Convert
Drop 50 files at once. Convert all to the same format and download individually or as a single ZIP package — one click.
Preview Before Download
View your converted file right in the browser before saving. Supports image preview, audio/video playback, and text preview.
Smart Format Detection
Upload a file and we instantly detect its type. Only compatible output formats are shown — no guessing, no errors.
Cloudflare Protected
Every upload is protected by Cloudflare WAF, rate limiting, and DDoS mitigation. Your files are safe from malicious actors.
Zero Storage
Files are processed in memory and deleted immediately. We never store your data permanently — not even temporarily.
How It Works
Four steps. Under a minute. Every time.
Upload Your Files
Drag and drop or click to browse. You can upload multiple files at once — up to 100MB each. We support every major format with zero setup required.
Choose Your Output Format
Smart detection shows only the formats compatible with your files. Search by name, browse by category, or click a popular conversion shortcut.
Adjust Quality Settings (Optional)
Fine-tune image quality, audio bitrate, video resolution, and more. Or leave defaults for the best automatic settings.
Preview & Download
When conversion is complete, preview your file in the browser first. Then download individually or as a ZIP — no auto-download, you're always in control.
Supported Formats
200+ formats across every major category
Frequently Asked Questions
Images (output): JPG, PNG, GIF, BMP, WebP, TIFF, ICO, PDF, SVG
Documents: TXT, Markdown (MD), HTML, Word (DOCX) and PDF — headings, lists, tables and pictures are kept where the target format allows
PDF to images: every page becomes a JPG or PNG (several pages arrive as a ZIP)
Spreadsheets: CSV, TSV, Excel (XLSX) and JSON — convert between them, or to HTML and PDF
Audio and video converting is available when the server supports it. Old .doc/.xls files, PowerPoint (PPTX), archives and e-books are not supported yet.