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# RAG chunking simulator

Split a document with fixed, sentence, paragraph or recursive chunking and preview sizes, boundaries and overlap before you spend money on embeddings.

Paste a document to see its chunks.

This is a dry run, not an index: nothing is embedded, stored, or sent anywhere, and the token number is the characters divided by 4 heuristic, not a tokenizer count. The sentence scanner treats every period, question mark and exclamation mark as an end, so abbreviations like e.g. split like sentence ends. Overlap carries whole sentences, paragraphs or words (raw characters for the fixed strategy), and a chunk whose single piece is longer than the ceiling is kept whole and flagged rather than cut mid-content. Check the size spread and boundary view here, then commit to the embedding run.
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## More AI tools

- [Tokenizer playground](/ai/tokenizer)
- [Context fit](/ai/context-fit)
- [Fine-tune JSONL formatter](/ai/jsonl-formatter)
[All AI tools](/ai)

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Canonical HTML: https://nutter.tools/ai/rag-chunking-simulator
Markdown version: https://nutter.tools/ai/rag-chunking-simulator.md
Plain-text version: https://nutter.tools/ai/rag-chunking-simulator.txt
Agent index: https://nutter.tools/llms.txt