2026 NotebookLM (now Gemini Notebook) Presentation Tutorial: Multilingual Support and Error Correction

Gemini Notebook (formerly NotebookLM) can turn PDFs, meeting recordings, and YouTube videos directly into slide presentations. The free tier supports it. CJK text distortion is the biggest problem, but a “discuss with an LLM first, then generate” workflow keeps the output usable.

Google renamed NotebookLM to Gemini Notebook on July 16, 2026. It is the same product, and existing notebooks and links are not affected.

What is Gemini Notebook?

Gemini Notebook is Google’s AI knowledge tool. Upload data (PDFs, Google Docs, web links, YouTube videos, audio files), and it analyzes the content using Gemini models to produce summaries, Q&A, podcast-style audio, and slide presentations.

The key difference from ChatGPT or Claude is that Gemini Notebook’s answers are strictly grounded in the uploaded source material. It won’t fabricate information; it pulls from what was provided. This matters for presentations: no AI hallucination ending up in your slides.

The most-used feature is the transcript output (in the Studio panel): drop in a meeting recording, get a detailed verbatim transcript, then pass it to Claude or ChatGPT for further analysis.

Gemini Notebook Presentation Plans

The Slide Deck feature works on all tiers, with quotas and limits varying:

Standard is enough for occasional use. Heavy users will want at least Pro for the source ceiling. Watermark removal requires Ultra; Pro doesn’t include it.

4 Steps to Generate a Presentation in Gemini Notebook

Step 1: Upload source documents

Open a new Notebook, add the materials. Supported formats: PDF, Google Docs, Google Slides, Google Sheets, YouTube links, web URLs, plain text notes, audio files.

Important: don’t upload everything. Pick 5-10 of the most relevant sources. Too many sources distract the AI; the resulting deck loses focus.

The best source quality comes from structured Google Docs (with headers and hierarchy). Well-structured PDFs also work well. YouTube and web pages depend on the content density.

Step 2: Choose Slide Deck in the Studio panel

Open the Studio panel on the right, select “Slide Deck”. Before generating, click the pencil icon for custom settings (many users skip this).

Two format options:

• Detailed Deck: more text, suited for follow-up reading or emailing to colleagues
• Presenter Slides: clean visuals, minimal text, suited for live presentation with verbal narration

For formal presentations, Presenter Slides usually looks better.

In the custom panel, a Prompt can be entered to guide style (“use professional blue tones, max 4 bullets per slide”). Style prompt adherence isn’t perfectly consistent.

Step 3: Wait for generation, then review

Generation takes 30 seconds to 3 minutes depending on source volume. The process runs in the background.

Once generated, review slide by slide. The February 2026 update added single-slide editing: click the pencil icon and instruct changes to a specific slide. This is much better than regenerating the entire deck.

Step 4: Export and refine

Three export options: share link, PDF, PPTX. To edit in Google Slides, the most reliable path is exporting PPTX first and uploading.

Standard refinement flow:

1. Generate v1 in Gemini Notebook
2. Export to PDF or PPTX
3. Final CJK text, font, and layout fixes in Google Slides or PowerPoint

Advanced Workflow: Discuss with an LLM Before Generating

Throwing data directly into Gemini Notebook gets a usable but imprecise result. Gemini Notebook doesn’t strategically organize narratives, it summarizes the data faithfully but doesn’t think about “who is this presentation for, where should the focus go”.

A more reliable flow:

1. Feed the data to ChatGPT or Claude first, discuss audience, core arguments, narrative structure
2. Have the LLM produce a complete slide outline: per-slide titles, 3-4 key points, visual element suggestions
3. Paste the outline into Gemini Notebook as a source document
4. Generate the Slide Deck in the Studio panel, with style requirements added in the prompt

Output narrative logic and visual quality both improve. The LLM does the thinking, Gemini Notebook does the producing, each plays to strengths.

The same logic applies to meeting notes: iPhone recording → Gemini Notebook transcript → Claude analysis. Gemini Notebook’s transcript quality is high enough to compete with dedicated transcription services.

Colored-Pencil Style: Reducing the AI Aesthetic

A useful technique discovered through repeated experimentation: AI-generated images all share recognizable visual cues, over-polished gradients, unnatural lighting, eerily perfect composition.

Adding “colored pencil style, no gradients” to the prompt pushes images toward a hand-drawn feel. Rough paper texture, uneven color blocks, visible brush strokes appear more often. Output looks more like something hand-drawn, less obviously AI.

Why it works: Gemini Notebook defaults toward clean, corporate, stock-photo aesthetics. Hand-drawn style breaks that polished feel. Combined with “no gradients”, the most telltale AI signs are reduced.

For finer control:

• Soft colored pencil on textured paper, no gradients, no digital effects
• Hand-drawn illustration style, imperfect lines, warm muted tones
• Sketch note style with colored pencil accents

These style prompts aren’t always fully executed in Gemini Notebook’s native interface. For precise control, generate images separately and paste them back into the deck.

The CJK Text Distortion Problem

Gemini Notebook vs Gamma vs Google Slides: Quick Comparison

A blended approach is most practical. Use Gemini Notebook to quickly turn large amounts of data into draft decks. For client-facing or accuracy-critical presentations, generate the draft in Gemini Notebook, then fix slide-by-slide in Google Slides. Gamma comes in for visual-heavy designs.

For all-English decks, Gemini Notebook’s narrative logic and image selection hold up. For CJK content, the rendered glyph distortion is severe enough to disqualify the deck from formal use without a heavy rebuild in Google Slides or Canva.

Penchan’s Experience

Gemini Notebook is part of Penchan’s daily workflow, primarily for transcript output. Meeting recordings → upload → transcript → pass to Claude / ChatGPT for analysis. This pipeline runs multiple times a week.

The Slide Deck feature was tested but doesn’t currently fit production work because the Traditional Chinese text distortion is severe enough to break formal presentations. Image selection and narrative logic on the deck side are excellent (a step above Gamma), but the rendering issue forces a Google Slides redo step.

The workaround that holds up: Gemini Notebook for outline and content extraction only, all visual design redone in Google Slides or Canva. Multi-step but each tool handles its strongest part.

The “colored pencil + no gradient” prompt convention came from iterative testing on cover image generation. Adding it cuts AI-aesthetic considerably for image outputs, even if Gemini Notebook’s adherence is inconsistent.

Further Reading

• 2026 AI Presentation Tools Comparison: Gamma, Gemini Notebook, Copilot Hands-On
• Gamma AI Presentation Tutorial
• AI Presentation Prompt Tips
• Gemini Notebook official site

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— Penchan