Cobalt Tools is a popular open-source downloader: paste a link, get the file, no ads. That is exactly why so many people search for "cobalt tools not working" when it suddenly returns an error instead of a video. This guide explains why it happens, what the "instances" people talk about on Reddit actually are, and which other ways to download a video by link you can use when Cobalt is down.
Why Cobalt Tools stops working
Cobalt does not store videos. Every time you paste a link, its server asks the platform for the video, the same way a browser does. When a platform changes how it serves video, every downloader has to adapt. Most failures fall into a few groups:
| What you see | Likely reason |
|---|---|
| Error on every YouTube link | YouTube changed its protection or limited requests from the server's address |
| Works for TikTok and X, fails for YouTube | YouTube support is temporarily switched off or rate-limited |
| "Couldn't get this video" on one link | the video is private, age-restricted, region-locked or deleted |
| Endless verification or blank page | the bot check did not load, often because of an ad blocker or VPN |
| The site does not open at all | the instance you use is down or blocked in your country |
YouTube is the most common source of trouble. It actively limits automated downloads from data centers, and a free public service that thousands of people use at once is an easy target.
What Cobalt "instances" are
Cobalt is open source, so anyone can run their own copy of it on their own server. These copies are called instances. When the main site has problems with YouTube, people share lists of community instances that still work.
Before you use one, keep in mind:
- Instances are run by strangers. They see the links you paste and can change what they serve at any time.
- They come and go. A list from last month is often half dead today.
- They face the same limits. If YouTube blocks a server, the instance stops working for YouTube too.
If you only need a file now and then, an instance can work. If you download regularly, a service with its own support is less hassle.
Quick checks before you switch
- Copy the link again from the Share menu of the app, not from the address bar of an embedded player.
- Remove everything after the question mark in the link, such as
?si=or tracking parameters. - Turn off the VPN or ad blocker for a moment if the page hangs on verification.
- Try a different video from the same platform. If it works, the problem is the specific video, not the tool.
If every link from one platform fails, the tool itself is the problem, and waiting or switching is all you can do.
Another way: download by link with Skachok
Skachok works the same way as Cobalt from your side: paste a link, choose the format, download. It supports YouTube, TikTok, Instagram Reels, X, Pinterest, Twitch, Kick, Vimeo, Bilibili, SoundCloud and many more sites in one window.
- Copy the link to a video.
- Open Skachok and paste the link.
- Click "Find" and choose the quality in the Video · MP4 tab or a format in the Audio tab.
- Click "Download".
Free use covers videos up to 720p: 3 downloads a day without an account and 5 with a free account. Higher quality, audio formats and more downloads come with paid plans, listed below. Platform guides: YouTube, TikTok, X, Instagram.
What you get for free and what is paid
| Plan | Price | Downloads a day | Video quality | Audio |
|---|---|---|---|---|
| Free | $0 | 5 (3 without an account) | up to 720p | — |
| Lite | $1.99 a month | 20 | up to 1080p | MP3, M4A |
| Pro | $3.99 a month | 50 | up to 1440p | MP3, M4A, OGG |
| Max | $5.99 a month | 100 | up to 4K | MP3, M4A, OGG, FLAC |
There is no automatic renewal: a plan simply ends when its time is up. After you register, Pro is active for 2 days for free, so you can try 1080p and MP3 before paying anything. Details are on the pricing page.
Cobalt vs a service like Skachok
| Cobalt Tools | Skachok | |
|---|---|---|
| Price | free, donations | free up to 720p, paid plans for more |
| Ads | none | on the free plan only |
| YouTube | often unstable | supported, with its own fallback servers |
| Audio | yes | MP3, M4A, OGG, FLAC on paid plans |
| Batch download | one link at a time | several links at once (3 free, up to 50 on Max) |
| Support | community, GitHub issues | support form on the site |
Cobalt is a great project, and when it works, it is hard to beat for a one-off download. The difference shows when a platform changes something: a service that earns money from subscriptions can afford to keep YouTube working with extra servers instead of switching support off.
Downloading audio when Cobalt fails
A lot of people use Cobalt to save a song or a podcast as audio. In Skachok, the Audio tab offers MP3, M4A, OGG and FLAC on paid plans, starting with Lite at $1.99 a month. For long mixes, lectures and podcasts, see the guide on converting long YouTube videos to MP3. For music, also read how to download music from YouTube to MP3.
What no downloader can do
Some videos cannot be downloaded by any tool, Cobalt or not:
- Private videos and posts from closed accounts.
- Paid content: YouTube Premium-only videos, rentals, paid courses.
- DRM-protected streams from Netflix, Disney+ and similar services.
- Live streams that are still running: wait until the recording appears.
If a tool promises to download these, be careful: it is usually a fake page full of ads.
FAQ
Why is Cobalt Tools not working for YouTube?
YouTube limits automated downloads from servers, and a free public service is easy to rate-limit. When that happens, YouTube links fail while other platforms still work. You can wait, try a community instance or use another downloader.
Are Cobalt instances safe?
They are copies of Cobalt run by other people. Most are fine, but the owner sees the links you paste and can change the site at any time. Avoid instances that ask you to install anything.
Is there a Cobalt alternative without ads?
Skachok has no ads on paid plans, starting with Lite at $1.99 a month. After registration, Pro is free for 2 days.
Can I download several videos at once?
Yes. In Skachok, paste several links, one per line: 3 at a time for free, 5 on Lite, 10 on Pro and up to 50 on Max.
Why does Cobalt say it couldn't get the video?
Usually the video is private, age-restricted, deleted or blocked in the server's region. Check that it opens in a private browser window without signing in.