# MarkItDown Memory Implications for Non-Seekable Streams: A Complete Guide

> Explore MarkItDown memory implications for non-seekable streams. Understand RAM buffering and resource management with this complete guide.

- Repository: [Microsoft/markitdown](https://github.com/microsoft/markitdown)
- Tags: deep-dive
- Published: 2026-04-11

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**Non-seekable streams force MarkItDown to buffer entire files into RAM before conversion, creating a one-time memory spike equal to the file size, though converters mitigate ongoing usage through explicit resource management.**

Understanding how Microsoft MarkItDown handles stream objects is critical when processing large documents in memory-constrained environments. When you pass a file-like object to `MarkItDown.convert_stream()`, the library checks its capabilities and makes architectural decisions that directly impact your application's memory footprint. This guide examines the memory implications of non-seekable streams based on the official