Context Window Packer
Fit as many RAG chunks as possible into a model context budget.
Chunks (separated by your delimiter)
Packed context
About the Context Window Packer
Split your retrieved chunks by a delimiter, set the system prompt, question and reply reservation, then let the packer greedily fill the remaining context window. It numbers the included chunks, shows exactly which ones were dropped and exports the final prompt ready to send.
Examples
3 chunks
3 retrieved passages + questionOutput
All 3 packed — 231 / 128,000 tokensKeyboard shortcuts
- Copy the main outputCtrl / ⌘ + Shift + C
- Download the resultCtrl / ⌘ + S
- Share this toolCtrl / ⌘ + Shift + S
- Reset the inputsAlt + R
- Open the tool search paletteCtrl / ⌘ + K
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Frequently asked questions
Version 1.0.0 · Updated 2026-08-15 · Runs entirely in your browser