EPUB Text Splitter

Upload an EPUB file, split it into parts, preserve headings and TOC, and optionally summarize chapters or parts with Cloudflare AI

File Information

Original File-

Total Characters-

Estimated Reading Time-

Detected Chapter-Like Headings-

Chapters

Only checked chapters will be summarized. Chapter sizes shown before footnote/reference removal.

Output File Name

Parts will be saved as: …_part1.epub

Number of Parts to Split Into

Summarize chapters Add a generated summary to the end of each logical chapter.

Note: AI summarization is handled by a Cloudflare Worker backend. An API key is required for authentication.

Worker API Key

Your API key is stored locally in your browser and never sent to anyone but your own worker. Keep it secret.

Workers AI Model

Select the AI model for summarization. Requests are sent to the worker backend.

Min characters to summarize

Skip summarization if chapter/part has fewer characters than this. Use 0 to summarize all.

Max characters per summary

Max text length sent to AI for summarization. Longer text is truncated.

Chapter summary prompt

Prompts and model selection are saved in browser storage on this device.