Check Your Content's Fit
What This Tells You
This estimates your token count and compares it against several common context window sizes, so you can quickly see whether your document, conversation, or codebase is likely to fit within a specific model's limit — and by how much room, or how much you'd need to trim.
Remember: Fitting Isn't the Same as Being Used Well
See our Context Window page for the "lost in the middle" phenomenon — content technically fitting within a model's limit doesn't guarantee the model weighs every part of it equally well, especially content buried in the middle of a very long input.
Related Pages
Frequently Asked
Is this an exact token count?
No, it uses the same rough estimation heuristic as our Token Calculator; treat results as a ballpark guide rather than an exact count.
Why do context window sizes vary so much between models?
Different providers and model architectures support different maximum context lengths, and this has been expanding rapidly as a competitive feature across the industry.
Does fitting within a context window guarantee good performance?
No — see our Context Window page on the 'lost in the middle' problem for why a large context window doesn't guarantee uniformly reliable use of all that content.
Does this tool send my text anywhere?
No, the calculation runs entirely in your browser.