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See how a prompt is tokenized with color-coded token boundaries.
This is an approximation showing typical BPE-style token boundaries. Counts will differ slightly from official tokenizers.
Text
Approx 28 tokens · 99 chars
The quick brown fox jumps over the lazy dog. Tokenization is approximate — real tokenizers use BPE.
Frequently asked questions
- Is Token Boundary Visualizer free to use?
- Yes. Token Boundary Visualizer is part of TULAKITO's collection of free browser tools. No signup, no subscription, no usage limits.
- Is my data safe with Token Boundary Visualizer?
- Yes. Token Boundary Visualizer runs entirely in your browser. Nothing you type, paste, or upload is sent to any server.
- Do I need to install anything?
- No. Token Boundary Visualizer works directly in your browser on desktop and mobile — no downloads or extensions required.