Free Tool
LLM Context Window Checker
Paste your text and see which models can fit it — and which ones can't. Know your limits before you hit them.
Your content
0 chars · ~0 tokens
Token counts are estimated (~4 chars per token for English). Context windows shown are for the standard model variant — extended or cached variants may differ.
Context window status
Paste your text and click Check.
Green = fits · Yellow = close · Red = too long.