Flat / WebM hosting
WebM hosting: upload web video and share a link
Publish finished WebM video from your browser or the CLI. Share a playback link or use the original file with your website's video player.
Checking your upload limits... · Public · Limits
Drop your WebM files here
or choose them from your device.
Select WebM filesWhat people see at your WebM link
Browser player for compatible video and audio codecs.
The screenshot shows a WebM with VP9 video and Opus audio. Its native controls come from the browser, so their appearance and features vary by device.
WebM commonly uses VP8, VP9, or AV1 video with Vorbis or Opus audio. Check the complete combination rather than relying on the extension.
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.webm serves the original file. Opening that URL does not convert its container or codecs.
How to upload WebM files and get a link
Prepare your files
Export a WebM using codecs supported by your audience's browsers. Choose dimensions, bitrate, and frame rate in your encoder. Transparency and HDR exports need their own device checks.
If your site needs another source, publish an MP4 alternative and reference both in your own player. Flat does not generate fallbacks or choose among formats automatically.
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.webmReplace 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
Check WebM playback, sound, seeking, and any transparency on the devices you need to support. Verify your own site's fallback separately.
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 WebM hosting
Website video assets
Host a prepared WebM and reference its exact URL from your own page. Keep your player markup and fallback selection in that page.
Short browser recordings
Share a completed WebM recording from a compatible recording tool. Keep the original available for download.
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.
WebM 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.
Does WebM always mean VP9?
No. WebM can use different video and audio codecs. Confirm the actual streams when checking browser compatibility.
Can Flat make a WebM from my MP4?
No. Encode it with your video tool before uploading. Flat keeps the uploaded bytes unchanged.
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?
Use the exact file URL with your own HTML video player:
<video controls playsinline src="https://YOUR-ADDRESS.onflat.page/motion.webm"></video>The browser must support the container and codecs. Flat's generated viewer cannot be embedded in an iframe.
Another video format?
Find the guide for your video file.
Share your WebM files.
Upload your finished files, check the published result, and copy the URL.
Publish videosFree to start · View pricing