Adding Images to Your Ebook: Complete Guide

When to Use Images in Your Ebook

Not every ebook needs images. The decision depends on your content type and what value the images add:

Images are essential for

• Cookbooks - Readers expect photos of finished dishes. A cookbook without images feels incomplete.
• Travel guides - Maps, location photos, and route diagrams make travel content actionable.
• How-to / tutorial guides - Step-by-step screenshots, diagrams, and annotated images are often clearer than text descriptions.
• Children's books - Illustrations are a core part of the reading experience.
• Design / photography books - The visual content IS the content.

Images are optional for

• Business / self-help - Charts and diagrams can help, but many bestsellers in these genres are text-only.
• Technical guides - Code screenshots, architecture diagrams, and flowcharts add value. Decorative images do not.
• Educational content - Diagrams and infographics improve comprehension for visual learners.

Images are usually unnecessary for

• Fiction - Novels, romance, thriller, and literary fiction are almost always text-only (except chapter headers or a single frontispiece).
• Poetry - Text is the medium. Decorative images can distract.
• Memoir - Unless a photo memoir, text carries the narrative.

The rule: if an image adds information or context that text cannot efficiently convey, include it. If it is purely decorative, leave it out. Every image increases file size, complexity, and formatting challenges.

How to Insert Images

Inkfluence AI supports three methods for adding images to your chapters:

Upload from device

Click the image button in the editor toolbar, then select a file from your computer. Supports JPEG, PNG, GIF, and WebP formats. The image is uploaded to cloud storage and inserted at your cursor position.

Paste image URL

If your image is already hosted online, paste the URL directly. The editor renders the image from the external source. Note: for reliable ebook export, uploaded images are more dependable than external URLs, which may become unavailable.

Drag and drop

Drag an image file from your desktop, file explorer, or another application directly into the editor. The image uploads and inserts at the drop position. This is the fastest method for batch insertion.

After insertion, images appear inline with your text. You can add text above and below the image, and the image will maintain its position relative to the surrounding content during export.

Image Formats: JPEG, PNG, WebP, and SVG

Recommendation: Use JPEG for all photographs and complex images. Use PNG for everything else (diagrams, screenshots, graphics, logos). This covers 99% of ebook image needs with universal platform compatibility.

Resolution and Sizing

DPI (dots per inch)

• 72-150 DPI - Sufficient for screen-only ebooks (Kindle, Apple Books, Kobo). Most ebook readers display at 167-300 PPI (pixels per inch), so 150 DPI source images look sharp.
• 300 DPI - Required for print-ready PDFs destined for KDP paperback, IngramSpark, or professional printing. Lower DPI images appear blurry in print.

Pixel dimensions

• Full-width images: 1,000-1,500 pixels wide. This ensures sharp display on tablets and high-resolution phones.
• Inline graphics: 500-800 pixels wide. Good for icons, small diagrams, and callout images.
• Minimum: Never use images smaller than 300 pixels wide. They appear pixelated on modern screens.

Aspect ratio

Maintain consistent aspect ratios for similar images throughout your book. A mix of landscape, portrait, and square images creates a disjointed reading experience. For tutorials, standardize your screenshot dimensions. For cookbooks, capture all dish photos at the same ratio.

Images in PDF vs EPUB

PDF and EPUB handle images very differently:

PDF (fixed layout)

• Images stay exactly where you place them - the layout is fixed.
• Full-width, half-width, and inline images all work reliably.
• Side-by-side image layouts work as expected.
• The exported page looks identical on every device.
• Best for image-heavy content: cookbooks, design books, portfolios.

EPUB (reflowable)

• Content reflows to fit the reader's screen size and font settings.
• Images scale to fit the available width - they may be full-width on a phone but half-width on a tablet.
• Side-by-side images become stacked vertically on small screens.
• Full-width images work most reliably because they scale predictably.
• Image positioning relative to text may shift depending on reader preferences.
• Best for text-primary content with occasional supporting images.

If your ebook is image-heavy, PDF is the safer export format. If your ebook is primarily text with a few supporting images, both formats work well.

Optimizing Images for File Size

Large images make your ebook slow to download and expensive on platforms like Amazon KDP (which charges delivery fees at the 70% royalty tier). Optimize before inserting:

Compression techniques

1. JPEG quality 70-80% - Reduces file size by 50-70% with minimal visible quality loss. Use tools like TinyPNG, Squoosh, or ImageOptim.
2. Resize to display dimensions - A 4000px-wide image displayed at 800px wastes space. Resize to the actual display size.
3. Strip metadata - Camera EXIF data (GPS, camera model, settings) adds 20-100KB per image. Strip it unless you specifically need it.
4. Convert when appropriate - PNG screenshots without transparency can be converted to JPEG, often cutting file size by 60-80%.

Target file sizes

• Full-width photography: 100-300KB per image (JPEG, 80% quality)
• Screenshots and diagrams: 50-200KB per image (PNG)
• Icons and simple graphics: 5-30KB per image
• Total ebook images: Keep under 5MB for optimal download speed and delivery costs.

Captions and Figure References

Captions add context to images and help readers understand what they are looking at.

Writing effective captions

• Be specific - "Revenue growth 2020-2026" is better than "Chart" or "Figure 1."
• Add context - Explain what the reader should notice: "Notice the sharp acceleration in Q3 2024 when AI audiobook tools launched."
• Keep it concise - Captions should be 1-2 sentences maximum. Longer explanations belong in the body text.
• Use consistent formatting - Same style for all captions throughout the book (italic, same font size, same position relative to image).

Figure numbering

For technical, educational, or data-rich books, number your figures sequentially: Figure 1, Figure 2, etc. This lets you reference them from the text: "As shown in Figure 3, revenue increased 45%." For casual non-fiction and guides, informal captioning without numbering is fine.

Using AI-Generated Images

AI image generation tools can create custom illustrations, diagrams, and visuals for your ebook:

AI image tools

• Inkfluence AI cover designer - Generates book cover images in Modern, Bold, and Minimal styles.
• Midjourney / DALL-E / Stable Diffusion - Generate custom illustrations, conceptual images, and artistic visuals from text prompts.
• Canva AI - Generate and edit graphics with AI assistance within existing Canva designs.

Commercial licensing

Check the licensing terms of each AI image tool:

• Inkfluence AI - Full commercial rights on all plans.
• Midjourney - Commercial use allowed on paid plans.
• DALL-E (OpenAI) - Commercial use allowed per terms of service.
• Stable Diffusion - Open source, commercially usable (check specific model licenses).

Always verify current licensing terms before publishing commercially. Terms may change.

AI image quality tips

• Specify the exact dimensions you need in the prompt to avoid excessive resizing.
• Generate at highest available resolution - upscaling is lossy.
• Request consistent style for multiple images in the same ebook.
• Check for AI artifacts: extra fingers, warped text, background inconsistencies.

Image Accessibility

Making your ebook images accessible is both a best practice and, on some platforms, a requirement.

Alt text

Every image should have alt text - a brief description of what the image shows for readers using screen readers. Good alt text describes the content and purpose of the image:

• Good: "Bar chart showing ebook revenue growing from $1.2 billion in 2020 to $4.1 billion in 2026"
• Bad: "Chart" or "Image 1" or "" (empty)
• Good: "Screenshot of the Inkfluence AI chapter editor with the image insertion toolbar highlighted"
• Bad: "Screenshot"

Decorative images

For purely decorative images (dividers, ornamental graphics), use empty alt text or mark as decorative. Screen readers skip these, which is the correct behavior - decorative images add no information.

Platform requirements

Apple Books requires alt text for EPUB accessibility compliance. Amazon KDP does not enforce it but recommends it. Adding alt text is a small effort that makes your ebook accessible to visually impaired readers and improves your ebook's quality rating on platforms that check accessibility.

Platform Image Requirements

Common Image Mistakes

1. Using low-resolution images - Pixelated images look unprofessional. Minimum 300px wide, prefer 1000px+ for full-width.
2. Not compressing images - Uncompressed images bloat your ebook. Always compress JPEG to 70-80% quality.
3. Side-by-side images in EPUB - EPUB reflows content. Side-by-side layouts break on small screens. Use full-width images in EPUB.
4. Missing alt text - Makes your ebook inaccessible to visually impaired readers and may fail Apple Books accessibility checks.
5. Too many decorative images - Every image increases file size and loading time. Only include images that add information.
6. Inconsistent styling - Mix of sizes, aspect ratios, and captioning styles creates a disjointed experience.
7. External URL images - URLs can break. Upload images for reliable ebook export.
8. Forgetting KDP delivery fees - Large images mean large delivery fees at the 70% royalty tier. Optimize before uploading.