AI Context Window Splitter
AI ToolkitRuns entirely in your browser, your document is never uploaded anywhere to be split.
How to use this AI context window splitter
- Paste the long document you need to split.
- Pick the context window size of the model you're targeting.
- Click "Split", copy each numbered part into the AI chat in order.
Why not just split at a fixed character count?
Cutting text at an arbitrary character position can slice a sentence, or even a word, in half, the model reading that fragment in isolation has no way to know the sentence continues in the next part. This tool splits at paragraph boundaries first, falling back to sentence boundaries within an overly long paragraph, so each individual chunk reads as complete, coherent text on its own.
Why not just split every N characters?
Splitting at a fixed character count can cut a sentence or word in half, which confuses the model reading that chunk in isolation. This tool splits at paragraph and sentence boundaries instead, keeping each chunk coherent on its own.
Do I need to tell the AI these are split parts?
Yes, when pasting each part, mention it's "part 2 of 4" of a longer document so the model has that context, especially if you want it to wait until the final part before responding.