Free online WEBP to FB2 converter

Source format: WebP

WebP is a modern image format developed by Google for efficient web graphics. It supports lossy and lossless compression, transparency, and animation. WebP is widely used on websites, in browsers, and in apps where smaller image sizes help improve loading speed and reduce bandwidth use. For this conversion, a WebP file is typically a cover image, illustration, or embedded graphic that needs to be placed into an ebook.

Target format: FB2

FB2 (FictionBook 2.0) is an XML-based ebook format used mainly for novels, magazines, and other text-centric books. It is popular in some ebook libraries and reading apps, especially in Russian-language ebook ecosystems. FB2 is valued for its structured markup, portability, and ability to store metadata such as title, author, and series information. However, FB2 is primarily a text format, so images are usually embedded as illustrations or cover art rather than serving as the main content.

How to perform the conversion

Converting WebP to FB2 is not a typical image-to-image conversion. In practice, you usually convert a WebP image into an FB2 ebook that contains the image, most often as a cover or illustration. The best approach depends on whether you want a single-image FB2 file or you are adding the image to an existing ebook.

Option 1: Create an FB2 file with the WebP image embedded

1. Open an ebook editor that supports FB2 structure, such as Calibre with editing tools or a dedicated FB2 editor.
2. Convert the WebP image to a more widely supported format first if needed, such as .jpg or .png. Many FB2 tools handle these formats more reliably than WebP.
3. Create a new FB2 book or open an existing one.
4. Add the image as a cover or illustration using the editor’s image insertion feature.
5. Save or export the file as .fb2.

Option 2: Use Calibre for ebook creation

1. Install Calibre.
2. If necessary, convert the WebP image to .png or .jpg first using an image editor such as GIMP, IrfanView, or ImageMagick.
3. In Calibre, create or edit an ebook and add the image as cover art or an illustration.
4. Use Convert books if you are converting from another ebook source into FB2.
5. Choose FB2 as the output format and complete the conversion.

Option 3: Convert the image for use in an existing FB2 file

1. Extract or open the FB2 file in an editor.
2. Replace or add the image in a supported format such as .png or .jpg.
3. Update the FB2 XML references so the image is included correctly.
4. Save the edited file as .fb2.

If you want a quick browser-based workflow, you can convert the file on 101convert.com for free, without installing any software.

Notes on quality, compatibility, and limitations

FB2 does not natively focus on standalone images, so a WebP file cannot usually be turned into a meaningful FB2 ebook by itself unless it is embedded as cover art or an illustration. If your goal is to preserve the image visually, converting WebP to .png or .jpg first is often safer because many FB2 readers and editors have better support for those formats.

Also note that animated WebP is generally not suitable for FB2, since FB2 readers typically support only static embedded images. Very large images may increase ebook size and can slow down some readers. For best compatibility, use a standard static image, keep dimensions reasonable, and verify the resulting FB2 file in a reader such as FBReader or Cool Reader.