10 free tools for YouTube creators. No signup. No backend. Everything runs in your browser.
Built because I kept switching between 5 different websites while making YouTube content. Mainly needed a thumbnail previewer and a deeplink generator that actually opens the YouTube app instead of Instagram's terrible in-app browser.
🔗 Live site: youtubekit.vercel.app
| Tool | What it does |
|---|---|
| 🖼️ Thumbnail Previewer | See your thumbnail on Home, Search, Recommendations and End Screen across Desktop, Tablet and Mobile. Dark and light mode. Shuffle position. |
| 🆚 A/B Thumbnail Tester | Upload two thumbnails, get an automatic score and winner based on title length, power words, CTR signals |
| 🎨 Color Palette Extractor | Extract dominant HEX colors from your thumbnail for consistent channel branding |
| 📺 Channel Art Previewer | Preview your banner with safe zone marked across Desktop, Tablet, TV and Mobile |
| 📱 Shorts Previewer | See how your Short looks on the mobile player and home feed card |
| ✅ Upload Checklist | 30-point SEO checklist before you hit publish |
| 🔗 Deeplinks Generator | Generate a Smart Link that opens the YouTube app on Android and iOS, and falls back to YouTube.com on desktop. Perfect for Instagram Stories. |
| 🔍 Video SEO Audit | Paste your video URL, auto-fetches the title, scores your SEO across 12 criteria |
| 📊 Channel Audit | Rate your channel on branding, consistency, upload frequency, playlists and more |
| ⬇️ Thumbnail Downloader | Paste any YouTube URL and download thumbnails in all available sizes |
When you share a YouTube link in your Instagram Story, it opens inside Instagram's in-app browser. Viewers are not logged into YouTube there, so they cannot like, subscribe or comment without extra steps. Engagement drops to near zero.
YouTube Toolkit generates a Smart Link that detects the device:
Android → intent:// fires → YouTube app opens directly
iOS → vnd.youtube:// fires → YouTube app opens directly
Desktop → redirects to youtube.com normally
One link. Works for everyone.
The entire app is two static HTML files. No framework. No build step. No dependencies to install.
index.html— the full toolkit (10 tools)go.html— the deeplink redirect handler
Everything runs in the browser. Images never leave your device. No data is collected.
Just download and open index.html in your browser. That is it.
git clone https://github.com/UtsavCodesZero/youtube-toolkit.git
cd youtube-toolkit
# Open index.html in your browserNote: The Smart Link deeplinks only work after deploying to a live URL (Vercel, Netlify, etc.) since they need a public address to redirect from.
# Push to GitHub, then import on Vercel
# No settings needed — just deploy as a static siteThe Smart Link in the Deeplinks Generator will automatically use your deployed domain.
| Layer | Technology |
|---|---|
| Frontend | HTML, CSS, Vanilla JavaScript |
| Fonts | Google Fonts (Geist) |
| Thumbnail fetch | YouTube oEmbed API (public) |
| Thumbnail images | YouTube CDN (public) |
| Hosting | Vercel (free tier) |
No frameworks. No build step. No npm. No node_modules.
I Love CV — Free resume builder, 5 templates, ATS score checker, PDF and DOCX export. No signup, no watermark.
YouTube Toolkit is completely free and always will be. If it helped you, consider supporting via eSewa:
eSewa: 9823418816
MIT — free to use, modify and share.
Built with ❤️ from Kathmandu, Nepal.