Observed arrival · 2026-09-13

Colophon: an EPUB repair bench

colophon.tools Observed source

Editorial interest 84/100 Selection signal · not a rating of the site

A browser-based toolkit for diagnosing and repairing ebook metadata, covers, series information, and damaged text.

Landing page captured for the 2026-09-13 issue.

Field notes

The toolkit separates diagnosis from repair: users can inspect a file first, then alter embedded metadata, cover handling, or text. Supported inputs listed on the page include EPUB, AZW3, MOBI, and FB2, with a stated 50 MB limit and no account requirement. Its examples go beyond generic file conversion, covering author sort fields, dual series locations for reader compatibility, EXIF-related cover failures, and Cyrillic characters mistaken for Latin ones.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

ƒJavaScriptBrowser-side code central

One card from the complete issue

W Has No Surviving Value

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