Token tool

Context Window Calculator

Paste text or enter token counts to see whether a document fits inside common AI model context windows.

Search intent

People preparing PDFs, transcripts, and code before sending them to an LLM.

Find models designed for long documents and codebases.

Use long-context prompts for PDFs and documents.

Estimate context fit

Model context window

Long PDFs, specs, transcripts, and larger code files.

Response reserve tokens Manual token count Text sample

Estimated input tokens

Text estimate: 24 tokens

Usable context

126,000 tokens

Usage

Chunks needed

Use the canonical URL for directories, newsletters, and community posts.

https://ryddleai.com/free-tools/context-window-calculator

Offer this snippet to partners and creators who want to embed the utility and link back.

Research communities

Share as a quick preflight check before summarizing papers or transcripts.

Developer forums

Position as a codebase and log-file context planning tool.

Decision tool

Answer a few questions and get a practical model recommendation for coding, research, writing, image prompts, or budget-sensitive work.

Cost tool

Estimate input and output token cost for one run, a batch job, or a monthly workflow before choosing a model.

Leaderboard

Sort a practical model leaderboard by coding, research, writing, cost, speed, and context window fit.

Move from calculator or prompt output into a real chat with GPT-5, Claude, Gemini, Grok, DeepSeek, and more.