Last updated on 12 May 2026
Admit it: you, too, have already spent hours searching for THE miracle solution to download this perfect YouTube video for your class, or this awesome podcast you wanted to share. And as if by magic, all the tools found on Google seemed either shady or … completely broken! 🤦♂
Maybe I have the solution. I have just discovered: Cobalt.tools. This little nugget is open source, free and secure. An ultra-convenient online service that will allow you to Easily download multimedia content from most popular web platforms: YouTube, Twitter, Snapchat and other TikTok. A simple, ad-free and risk-free service for your computer. What more can I ask for?
Table of Contents
A versatile tool at the click of a button to download YouTube videos, sounds, photos, gifs …
Cobalt.tools stands out for its simplicity and allows you to save everything that is on your favorite websites.
Copy and paste the URL, the tool automatically scans the link and offers different download options (file quality, format, etc.). The clear and intuitive interface allows for quick handling, even for the less tech-savvy. No need to juggle between different services depending on the type of content.
No ads, trackers, paywalls or other nasty surprises. Just a handy web application that works anywhere from a browser, when you need it.
Please note: Compatible with over 100 platforms, including YouTube, Twitter, Instagram, and leading sharing sites.
How to use Cobalt Tools in French: step-by-step tutorial
Cobalt.tools works directly in the browser, without registration or installation. Here are the three steps to download a YouTube, TikTok or Instagram video in less than 30 seconds.
Step 1 – Copy the URL of the video
On YouTube, TikTok, Instagram, X (Twitter), Reddit, Twitch, Vimeo, click on "Share" and then "Copy link". The URL should look like https://www.youtube.com/watch?v=... or https://www.tiktok.com/@user/video/....
Step 2 – Paste URL to cobalt.tools
See you on cobalt.tools and paste the link into the central field. Cobalt automatically detects the source.
Step 3 — Choose format and download
Select the desired format (MP4 video, MP3 audio, GIF) and quality (up to 4K depending on the source). Click on the arrow: the download starts instantly, without advertising or redirecting.
Formats and qualities supported by Cobalt Tools
| Type | Available formats | Maximum quality |
|---|---|---|
| Video | MP4, WebM | 4K (2160p) |
| Audio | MP3, OGG, WAV, Opus | 320 kbps |
| Animated image | GIF | 1080p |
Multiple uses on a daily basis
In addition to personal uses, Cobalt can also provide you with great services in your preparations.
Prepare your classes serenely
Download YouTube documentaries to stream even without connection and without any advertising. Create a library of images and infographics for your presentations. Archive articles for your case studies.
Create audio compilations for listening exercises in foreign languages, download an episode of a podcast to listen to in … class
Another example of practical use is the preparation of a course on media or information literacy. The platform allows you to download important publications on platforms such as Twitter, TikTok or Instagram. This content can be used as a basis for classroom discussions on information verification or media bias.
Privacy and security
Unlike many similar tools, Cobalt does not store your data or display intrusive ads. An approach respectful of privacy.
The legal aspects must also be considered and not neglected. On paper, it is always recommended to respect copyright and check the conditions of use of the uploaded content.
The strengths of the service:
- No installation required
- Simple and clear web interface
- Wide compatibility with popular sites
- Choice of formats and download qualities
Types of content supported
- Videos (YouTube, Vimeo, TikTok…)
- Images and photo albums
- Social media posts
Cobalt.tools is a convenient solution that simplifies and secures the downloading of web content. All for free and without registration. A tool that saves time, organises resources and better prepares courses, even offline.
It must of course be used responsibly to comply with copyright and regulations, but it can help you more than once. To be inserted in its digital toolkit.
Frequently asked questions about Cobalt Tools. Questions you might be asking yourself.
🔒 Is it legal to use Cobalt ?
Yes, the tool is legal. However, its use must respect the copyright and terms of use of the platforms concerned. For example, downloading a YouTube video without explicit permission may violate the platform's rules. However, it is still important to:
- Systematically quote your sources
- Limit use to necessary extracts
- Reserve the use to the class frame
- Check the specific conditions according to the type of resource
Is Cobalt Tools really free?
Yes, yes. Cobalt.tools is an open source project distributed under the AGPL-3.0 license. No registration, no advertising, no payment. The source code is available on GitHub.
Does Cobalt Tools work on mobile (Android, iPhone)?
Yes, from any mobile browser. On iPhone, you can download using the Files app or the Camera Roll, depending on the format. On Android, the file is saved directly to the Downloads folder.
💻 Should I install something on my computer?
No, the platform works directly in the web browser. No installation is required, nor is any registration required.
📱 Can I use the tool on a tablet?
Yes, the interface fits perfectly with mobile devices. So you can prepare your resources from any internet-connected device.
🎥 What is the quality of the downloaded files?
Cobalt.tools offers several quality options for videos, up to 4K if available. For classroom use, the 720p format usually offers a good compromise between quality and file size.
💾 Is there a limit on the size or number of downloads?
There is no daily limit on downloads. The only constraint is the maximum file size set by the source platforms (for example, YouTube limits some videos to 2 hours).
🔄 Are downloaded files updated automatically?
No, the downloaded files are static copies. If the original content is changed, it will need to be downloaded again.
📊 Can I download multiple files at the same time?
Currently, downloads are done one by one. To save time, note the URLs of the content you want to download in a text document to process them more quickly in series.
Does Cobalt Tools still work with YouTube in 2026?
Yes, yes. The Cobalt team actively maintains compatibility with YouTube, TikTok and other platforms. In case of occasional (rare) unavailability, mirror instances are accessible, listed on the official homepage.
🌐 Does the tool work without an internet connection?
A connection is required to download the content, but once downloaded, you can use it offline. This is particularly useful for classrooms with limited internet connection.
A useful comparison with other download tools
| Tool name | Features | Security | Confidentiality | Reputation | Price Model |
|---|---|---|---|---|---|
| Cobalt Tools | Downloading videos and audio from YouTube, TikTok, Instagram, Facebook, etc.; high-quality downloads; versatile options like MP3; compatible with iOS, Android and Windows; keyboard shortcuts. | Described as 100% safe and legitimate; experience without advertising. | Not specified in the raw data. | Positive reputation, described as legitimate, reliable and safe. | Free |
| EaseUS Video Downloader | Download videos and audio from over 1000 websites; batch download; HD/4K/8K quality; built-in converter for MP3; quick search; download playlists and channels. | Considered safe and reliable; uses encryption and other security measures to protect data. | Strict privacy policy, including data encryption, limited data sharing and compliance with data protection regulations. | Generally positive reputation for its functionality and security; some concerns about prices and availability of alternatives. | Paying |
| 4K Video Downloader | Downloading videos up to 8K; extracting subtitles; MP4 and MKV formats; downloading playlists and channels; Smart mode for one-click downloads. | Verified by more than 50 antiviruses, free of malware, advertisements and viruses. | Not specified in the raw data. | Highly appreciated for its ease of use, high-quality downloads and multi-platform support. Positive reviews from users. | Paid (with limited free version) |
| YTD Video Downloader | Downloading videos from more than 50 websites; converting videos into multiple formats; downloading playlists; basic video editing; built-in video player. | Free from malware and viruses when downloaded from official sources. Possibility of advertising from unofficial sources. | Does not store user data and is considered safe for personal use. It is recommended to download the software from official sources. | Mixed reputation. Praised for its ease of use and functionality, but some users have reported advertising issues in some versions. | Free (with paid version) |
| SnapDownloader | High-speed downloads from over 900 websites; video downloads up to 8K; multiple formats; bulk downloads; video cutting; proxy configuration; built-in browser. | Prioritizes the security of users without advertising, malware or trackers. Strict safety protocols. | Does not collect, store or analyse users’ personal information or uploaded content. Does not track downloads and does not request unnecessary permissions. | Strong reputation with an average rating of 4.9/5 based on over 500 reviews. Ease of use, fast download speeds and robust features appreciated. | Paying |
English
A real nugget!
Hello, I use Video DownloadHelper which works really well too.