count-tokens

Ultra-fast, client-side token counter for large text blobs using OpenAI-style BPEs.

What this is

• Static site (GitHub Pages) that counts tokens entirely in your browser
• Built with bpe-openai compiled to WebAssembly
• Optimised for huge pastes (even repo-level): avoids per-token highlighting that makes other sites hang
• Zero backend; no data leaves your machine

Supported encodings

• cl100k_base
• o200k_base
• voyage3_base