Context fit
A context window is the whole of what a model can hold at once — your document, the conversation and its own reply. Drop a file or paste text to see how much of each model's window it would take.
Your file never leaves this page. There is no server runtime behind this site: the PDF is parsed and the tokens are counted by your own browser. Nothing is uploaded, nothing is logged, nothing is stored — you can read the network panel and check.
drop a file here — .txt, .md or a PDF
Result
Nothing measured yet. The encoding dictionary is only downloaded once there is text to count, and the PDF engine only when you hand us a PDF.
Want to see the individual tokens rather than the totals? Token counter shows the split.