GPT Tokenizer Playground
Visualises tokens for OpenAI models and estimates prompt cost against context limits.
Artifact by niieani
Use it
Opens gpt-tokenizer.dev in a new tab. Nothing to install.
- You provide
- Text
- You get
- Token view, counts and cost estimate
- Account
- No sign-up needed
- AI
- No AI: a plain tool
- Your input
- Not stated: check the tool's privacy notes before using private data
- Price
- Free to use
- Made with
- Open-source web app
- Source
- Open source
- Link check
- Answered on Oct 31, 2026
About
Category: Developer tools · tokenizer
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Signals
- Stars
- 857
Details
- Auth
- No auth
- License
- MIT
- Repository
- github.com/niieani/gpt-tokenizer
- Website
- gpt-tokenizer.dev
- First seen
- Oct 31, 2026
- Last checked
- Oct 31, 2026
- Source
- GitHub
Cite this page
GPT Tokenizer Playground: free online tool. Agent Mart. https://agentmart.dev/artifacts/gpt-tokenizer-playground (last updated 2026-10-31)