NoteLM.ai

What is NoteLM.ai and what free YouTube tools does it offer?

NoteLM.ai provides 6 free YouTube AI tools: (1) YouTube Channel Analytics - analyze any channel's stats, engagement & estimated revenue, (2) YouTube Video Summarizer - Chrome extension for AI summaries with clickable chapters, (3) YouTube Transcript Generator - extract full transcripts with timestamps, (4) YouTube Comment Extractor - download all comments as JSON/CSV, (5) YouTube Thumbnail Downloader - get HD thumbnails in all sizes up to 1280×720, and (6) YouTube Subtitle Downloader - one-click SRT downloads. All tools are 100% free with no signup required.

Is NoteLM.ai completely free to use?

Yes, all NoteLM.ai tools are 100% free with no hidden costs. The online tools (transcript generator, comment extractor, thumbnail downloader) work instantly in your browser. For the Video Summarizer Chrome extension, you'll need a free Gemini API key from Google AI Studio, which provides 1,500 free requests per day — more than enough for daily use. No credit card is ever required.

How do I get a YouTube transcript for free?

Use our free YouTube Transcript Generator at notelm.ai/youtube-transcript-generator: (1) Copy any YouTube video URL, (2) Paste it into the tool, (3) Click "Generate Transcript" to extract the full text with timestamps, (4) Copy to clipboard or download as TXT/SRT format. Works with any video that has captions (auto-generated or manual). No signup or payment required.

What is the difference between YouTube transcripts and subtitles?

Transcripts are the full text of a video in readable document format — ideal for reading, studying, or SEO. Subtitles (SRT files) are formatted with precise timing codes for video players — used for adding captions to videos. NoteLM offers both: the Transcript Generator gives you readable text, while the Subtitle Downloader provides SRT files compatible with VLC, Premiere Pro, and all major video players.

What YouTube thumbnail sizes can I download?

Our YouTube Thumbnail Downloader offers all 5 standard sizes: maxresdefault (1280×720 HD - highest quality), sddefault (640×480), hqdefault (480×360), mqdefault (320×180), and default (120×90). All sizes available in JPG format, with WebP option for smaller file sizes. Perfect for social media, blog posts, video editing, and presentations.

What is the best YouTube thumbnail size for my channel?

The recommended YouTube thumbnail size is 1280×720 pixels (HD) with a 16:9 aspect ratio. This is what YouTube recommends officially. Use our thumbnail downloader to analyze competitor thumbnails or download HD versions for reference. For custom thumbnails, keep file size under 2MB and use JPG, PNG, or GIF format.

How do I get a free Gemini API key for the video summarizer?

Getting a free API key takes under 2 minutes: (1) Visit Google AI Studio at aistudio.google.com, (2) Sign in with your Google account, (3) Click "Get API key" in the left menu, (4) Click "Create API key" and copy it. The free tier includes 1,500 requests/day for Gemini 2.5 Flash. No credit card required — the key works immediately.

What are the Gemini API rate limits?

Google's free tier limits for Gemini 2.5 Flash: 1,500 requests per day, 15 requests per minute, 1,000,000 tokens per minute. For Gemini 2.5 Pro: 50 requests per day, 2 requests per minute. These limits reset daily at midnight Pacific Time. Most users never hit these limits with normal usage.