Flat / MKV hosting
MKV hosting: upload Matroska files and share downloads
Upload Matroska MKV files from your browser or the CLI. Give recipients a link to the original download for their compatible player or editor.
Checking your upload limits... · Public · Limits
Drop your MKV files here
or choose them from your device.
Select MKV filesWhat people see at your MKV link
Original-file hosting. No built-in video player for this container.
The screenshot shows Flat's file download view for an MKV. The viewer does not select subtitle tracks, switch audio tracks, or play this container.
Matroska can store several audio, video, and subtitle streams. Those remain in the uploaded file for a compatible application to read.
Public links open without a Flat account. Several files open in the explorer, where readers can choose a file. Original downloads remain available.
The exact path /motion.mkv serves the original file. Opening that URL does not convert its container or codecs.
How to upload MKV files and get a link
Prepare your files
Check the track list, default audio track, and embedded subtitles in your desktop player. Keep external subtitle files beside the MKV if they are part of the handoff.
For quick browser review, export a separate viewing copy with the intended tracks. Use MP4 hosting for that copy; Flat does not flatten or convert the MKV.
Publish from your browser or terminal
In your browserGo to uploaderDrop, publish, copy the link.
Select your finished files in the uploader above. Enter your email if signed out, then choose "Publish videos".
Selected files need unique names and publish at the top level. The browser uploader does not accept folders or extract ZIPs. Use the CLI when relative paths matter.
TerminalNode.js 20+One command. Files or folders.
npx -y @getflat/cli deploy ./motion.mkvReplace the example path with your file, or pass a folder path to preserve its structure. The CLI prints the published URL.
Check the published result
Download the published MKV and check picture, audio tracks, subtitles, and seeking in the recipient's player.
Signed-out uploads expire after 1 hour by default. Sign in before expiry to keep them online, or sign in before publishing for no default expiry.
When to use MKV hosting
Multi-track handoffs
Share a Matroska file that needs to retain several audio or subtitle tracks. The original download preserves the container.
Existing recording delivery
Send an MKV produced by a recording tool without forcing a new encode. Add a viewing copy when recipients need browser playback.
Keep a version, or keep an address.
Share this version
Every upload gets its own link. Publishing revised files creates a new link and leaves the earlier version unchanged. Use the version link when someone needs to review a specific upload.
Update files at one address
Use a named onflat.page address or your own domain. Sign in, then publish with the CLI using --domain. Publish revised files with the same domain to point that address to the new upload.
Named addresses are included on Free. Adding your own domain requires a paid plan. The browser uploader does not set up or repoint these addresses.
MKV hosting questions
Is hosting free, and what are the limits?
Yes. Signed-in Free includes 5 MiB per upload, 1 GiB of storage, and 5 GiB of monthly transfer, with no default expiry. The per-upload limit covers all files in that upload. Paid plans raise these limits.
Do readers need a Flat account?
No. Public links open without a Flat account. Anyone with the link can open the uploaded files. Password-protected links also require the visitor password.
Can I password-protect my upload?
Yes. Password protection is available on every plan. Add --password YOUR_PASSWORD to your CLI deploy command. It protects access to the upload and its files, but does not prevent someone with access from saving a copy. The browser uploader creates public uploads.
Can I replace files without changing the link?
A version link always refers to its original upload. For same-address updates, use a named address or your own domain. Publish revised files with the same --domain value in the CLI to point that address to the new upload.
What happens when an upload expires?
Flat stops serving it. An expired upload cannot be recovered. Signed-out uploads expire after 1 hour by default. For browser uploads, use the sign-in link shown after publishing. For CLI uploads, run npx -y @getflat/cli login. Complete sign-in before expiry to keep the upload online. If you chose a shorter expiry in the CLI, that deadline stays in place.
Will changing an MKV codec enable Flat's preview?
No. Flat does not route MKV files to its video player. Even an MKV with browser-compatible codecs uses the download view.
Does Flat extract MKV subtitles or audio tracks?
No. Download the original and use a compatible tool to inspect or extract its streams.
How large can a video upload be?
Upload allowances depend on your plan and cover all files in the upload. Compare current plan limits. A larger upload allowance does not add codecs, container support, or transcoding. Original files remain downloadable when a preview is unavailable.
Can I embed this file on my website?
You can link to the original download. An HTML video element does not add a decoder for this container. Export a browser-compatible viewing copy with your own tool if you need embedded playback. Flat does not convert the original.
Another video format?
Find the guide for your video file.
Share your MKV files.
Upload your finished files, check the published result, and copy the URL.
Publish videosFree to start · View pricing