Marker
The best PDF-to-Markdown quality here — check the licence first.
Marker converts PDFs to Markdown with the highest fidelity of anything in this list: it handles equations, code blocks, tables and multi-column layouts, and optionally uses an LLM pass to improve difficult sections. For academic papers and technical documents the output quality is noticeably ahead. The caveat we would rather state than have you find in a licence review: Marker is GPL-3.0 with an additional revenue condition from its maintainer, so organisations above a revenue threshold need a commercial licence. Free for research and for smaller organisations, but not unconditionally.
What it does well
- +Best PDF-to-Markdown fidelity of the options here
- +Handles equations, code blocks and complex tables well
- +Optional LLM pass for difficult pages
- +Runs entirely locally
Where it falls short
- −Not unconditionally open source — revenue-gated commercial terms
- −GPL-3.0 copyleft affects how you can distribute derived work
- −GPU strongly recommended for reasonable throughput
Marker as an alternative to
Where Marker shows up in our comparisons, and how it ranked.
Marker head-to-head
Straight comparisons against the tools people weigh it against.