Developer Tools
Tokenizer Visualizer
Visualize how your text is split into tokens for LLMs. See approximate token boundaries with color-coded highlights.
The quick brown fox jumps over the lazy dog. Hello, world!
14
Visual tokens
15
Approx BPE tokens
11
Words
Visual approximation — actual BPE tokenization may split differently. Approx count uses ~4 chars/token average.
LLM Tokenizer Explained: How to See How Your Text Gets Tokenized
What BPE tokenization is, why some words split into multiple tokens, how token boundaries affect prompt cost and output quality, and how to visualize tokens.