Video
MP4
Video output for playback on common devices and browsers. Available video qualities depend on the source.
FAST-VID / YouTube
YouTube Video Downloader
Paste a public YouTube link to inspect the MP4, MP3 and conditional M4A formats that link actually exposes. No account, extension or sign-up is required. Paste a public YouTube link to inspect the formats it exposes. Public links only; no account or cookies needed.
- Public links only
- One video at a time
- No account or cookies
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Before you paste
Clear limits, no account access
FAST-VID is a public-link workspace. The interface stays focused on one video, the formats the source exposes and a temporary file you save yourself.
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Public links only
Private, members-only, login-only, age-gated and DRM-protected videos are not supported.
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One video at a time
No playlists, channels or bulk downloads. You can queue up to 5 formats from one public video.
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No account login
No account connection, cookie import or browser-extension access.
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500 MB maximum
Output files are capped at 500 MB. A specific quality or codec is not guaranteed.
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Temporary files
Completed files are normally removed after 30 minutes by default. Save the file before it expires.
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Source-dependent output
MP4, MP3 best/128 kbps and conditional M4A appear only when the YouTube link exposes them.
How it works
From public link to saved file
One lookup, one format choice and one download. The source decides what appears in the middle step.
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Paste the public link
Use a YouTube watch, share or Shorts link that opens without signing in. Private, members-only and DRM-protected videos are not supported.
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Inspect the formats
Choose from the MP4, MP3 or conditional M4A options that the source actually exposes. The exact quality list can vary from video to video.
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Download and save
Start the download, watch the progress display, then save the finished file before the temporary retention window ends. Completed files are not a permanent library.
Output
Formats available when the source offers them
There is no fixed format menu. FAST-VID presents the supported MP4, MP3 and conditional M4A streams returned for the public link.
Audio
MP3
Audio output in best or 128 kbps quality where the source can be converted.
Conditional audio
M4A
Source-dependent audio passthrough. It appears only when the source exposes a compatible stream.
Limitations
What this downloader will not do
These are product boundaries, not temporary promises. Checking them first avoids failed lookups and wasted downloads.
Review all limitations Access, formats, size, retention and rights
- Access and scope
- Public, single-video links only. Private, members-only, login-only, age-gated and DRM-protected content is not supported.
- No account connection, cookie import or browser-extension access.
- No playlists, channels or bulk downloads. Queue up to 5 formats from one public video.
- Formats and preview
- MP4, MP3 best/128 kbps and source-dependent M4A only. WebM, MKV, MOV, FLAC and lossless output are not offered.
- Preview is available for MP4 only, after a short-lived authenticated token is issued.
- Size and retention
- Downloads are capped at 500 MB. A specific quality or codec is not guaranteed.
- Completed files are temporary and are normally removed after the configured retention window (30 minutes by default). Save the file before it expires.
- Shorts and usage rights
- YouTube Shorts are source-dependent until they have been tested end-to-end for the specific link.
- FAST-VID does not grant rights to content you are not authorized to download. Read the YouTube video download guide for the public-link workflow.
Common problems
What to check when a lookup fails
Most failures start with the link or the source. These checks resolve the problems the current interface can explain.
Show troubleshooting checks Link, format, size, retention and preview issues
Link and source checks
The link will not load
Check that the video opens in a private browser without signing in. Private, members-only, age-gated and DRM-protected videos are outside the current product.
No usable formats appear
The source did not expose a supported MP4, MP3 or M4A stream. Try another public video; FAST-VID cannot add a format the source does not offer.
After lookup and download
The file is too large
Choose a lower video quality or a shorter video. The output cap is 500 MB, and a format that exceeds it is disabled rather than silently changed.
The download has expired
Completed files are temporary and normally clear after 30 minutes by default. Save the file as soon as it is ready.
Preview is not shown
Preview is available for MP4 only and needs a fresh authenticated token. Audio-only results do not have a preview.
The link changed after lookup
If you edit the URL after fetching formats, submit the new link again. The existing result belongs to the previous URL.
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Answers
YouTube downloader questions
Short answers to the limits that matter before you paste a link.
Can I download private or members-only YouTube videos?
No. FAST-VID works with public links only and does not accept account logins, cookie imports or access to private and members-only content.
Does FAST-VID support YouTube playlists?
No. The current product handles one public video link at a time. Playlist, channel and batch downloads are outside this version.
Why is the quality or codec I expected not listed?
The available formats come from the source and can change between videos. FAST-VID does not invent a quality or codec that the link does not expose.
Can I download a YouTube Short?
Shorts use the same public-link flow, but Shorts support is source-dependent until it has been tested end-to-end for the specific link. If the source exposes supported formats, they can appear in the normal results.
What is the file-size limit and how long are files kept?
Downloads are capped at 500 MB. Completed files are temporary and are normally removed after the configured retention window, 30 minutes by default. Save the file before it expires.
Is FAST-VID affiliated with YouTube?
No. FAST-VID is an independent tool and is not endorsed by or affiliated with YouTube.