Is my prompt data sent to a server?
No. The token encoding library runs entirely within your browser's JavaScript engine. Your proprietary prompts are completely secure.
Prompt Token Calculator & API Cost Estimator
Calculate exact token counts and estimated costs for LLM prompts • Encode strings using official tiktoken encodings locally
Last updated: May 2026
Developer Tools 0.0(0 Reviews)
Calculate exact token counts and API costs for your large language model prompts before sending them to OpenAI or Anthropic. 100% secure client-side processing.
• Fact-Checked & Verified•Compliance: 2026 Standards•Last Updated: May 2026
01
Why Use our LLM Prompt Token Calculator?
Calculate exact token counts and API costs for your large language model prompts before sending them to OpenAI or Anthropic. 100% secure client-side processing.
How it works
The tool uses the official `js-tiktoken` library, operating the `cl100k_base` encoding standard used by models like GPT-4 and GPT-3.5 directly inside your browser.
02
Key Features of LLM Prompt Token Calculator
Exact token counting using official BPE standards
Real-time estimated cost calculators for top models
100% client-side processing (your prompts never leave your browser)
03
Common Questions About LLM Prompt Token Calculator
How many words is one token?
As a general rule of thumb, 1 token is roughly equivalent to 4 characters or 0.75 words of standard English text.
Looking for more professional developer utilities?
Explore All WebToolkit Pro ToolsEditorial Standards & Processing Transparency
This utility is engineered and maintained under strict editorial and technical standards. All source calculations are audited against official formatting standards and RFC specifications to guarantee mathematical and logic accuracy.
Content Creation & Automation Transparency: To ensure our dynamic developer specifications and reference datasets remain fully comprehensive and updated against newly released RFC updates, this page compiles technical documentation using advanced programmatic retrieval tools. Every output data block, feature list, and system specification is subsequently audited, fact-checked, and verified by our systems engineers for absolute correctness and accuracy.
Security Guarantee: To guarantee absolute user privacy, this tool executes 100% client-side inside your web browser. None of your input strings, payloads, keys, or files are ever transmitted to a server or stored externally.
Built by Abu Sufyan • Also explore: Severance Calculator & TradeConvert
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