Split File (Sync)

Split a document synchronously, waiting for the result before returning. This endpoint has a **5-minute timeout** — if processing takes longer, the request will fail. **Note:** This endpoint is intended for onboarding and testing only. For production workloads, use `POST /split_runs` with [polling or webhooks](https://docs.extend.ai/2026-02-09/general/async-processing) instead, as it provides better reliability for large files and avoids timeout issues. The Split endpoint allows you to split documents into multiple parts using an existing splitter or an inline configuration. For more details, see the [Split File guide](https://docs.extend.ai/2026-02-09/splitting/configuring-a-splitter).