Unable to use svg as cover image #5412

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OVERLORD · 2026-02-05T10:02:54+03:00

OVERLORD commented

2026-02-05 10:02:54 +03:00

Originally created by @outfield on GitHub (Aug 28, 2025).

Attempted Debugging

I have read the debugging page

Searched GitHub Issues

I have searched GitHub for the issue.

Describe the Scenario

Edit book -> cover image
When I click "select image", the upload window listed supported file format(.xbm,.tif,...)
It is ok to choose a svg file, show the image preview, but it's not allowed to save the book.
When save the book, it says "The image must have a valid & supported image extension."

Exact BookStack Version

v25.02

Log Content

Hosting Environment

linuxserver/docker-bookstack, installing using docker

Originally created by @outfield on GitHub (Aug 28, 2025). ### Attempted Debugging - [x] I have read the debugging page ### Searched GitHub Issues - [x] I have searched GitHub for the issue. ### Describe the Scenario Edit book -> cover image When I click "select image", the upload window listed supported file format(.xbm,.tif,...) It is ok to choose a svg file, show the image preview, but it's not allowed to save the book. When save the book, it says "The image must have a valid & supported image extension." <img width="738" height="308" alt="Image" src="https://github.com/user-attachments/assets/bcaf6626-e09f-47e3-a0c3-b0fd9e530950" /> ### Exact BookStack Version v25.02 ### Log Content ```text ``` ### Hosting Environment linuxserver/docker-bookstack, installing using docker

OVERLORD added the 🐕 Support label 2026-02-05 10:02:54 +03:00

OVERLORD closed this issue

2026-02-05 10:02:56 +03:00

OVERLORD commented

2026-02-05 10:02:58 +03:00

@ssddanbrown commented on GitHub (Aug 28, 2025):

Hi @outfield,
SVG images are currently not supported. There's an existing request in #1103 to add them as a supported image format.

@ssddanbrown commented on GitHub (Aug 28, 2025): Hi @outfield, SVG images are currently not supported. There's an existing request in #1103 to add them as a supported image format.

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Reference: starred/BookStack#5412