Best tools for converting PDFs and documents for LLMs
Clean input makes better AI output. These parsers turn PDFs, Office files and slides into markdown, JSON or chunks that models and RAG pipelines can use.
Ranked by score on our 100-point rubric (how we score). Scores are initial editorial estimates from public information, not hands-on tests. Pricing is labeled verified (checked on the vendor's official pricing page, with date) or unverified.
Quick picks
| # | Tool | Tier | Score |
|---|---|---|---|
| 1 | Docling Open-source document conversion toolkit | A | 81 |
| 2 | Mistral OCR Document understanding OCR API | A | 77 |
| 3 | LlamaParse GenAI-native document parser | A | 73 |
| 4 | Marker Open-source PDF to markdown converter | A | 73 |
| 5 | Unstructured ETL for unstructured data | B | 69 |
| 6 | Reducto High-accuracy document parsing API | B | 66 |
The ranking
-
IBM-originated library that converts PDFs, Office docs and more into structured formats for AI.
- Best for
- You want free, local document parsing.
- Skip it if
- You want a hosted API with SLAs.
- Pricing
- Free and open source unverified editorial summary, not yet confirmed on an official pricing page
- Platforms
- Python SDK · CLI · MCP
-
OCR model that extracts text, tables and images from PDFs into markdown via API.
- Best for
- You need high-volume PDF-to-markdown conversion.
- Skip it if
- You need fully local processing.
- Pricing
- Pay-per-page API pricing unverified editorial summary, not yet confirmed on an official pricing page
- Platforms
- API
-
Parses complex PDFs, tables and slides into LLM-ready formats, part of LlamaCloud.
- Best for
- You build RAG over messy documents.
- Skip it if
- You need on-prem without enterprise contracts.
- Pricing
- Free plan (10K credits); Starter $50/mo; Pro $500/mo ✓ verified on the official pricing page, Oct 18, 2026
- Platforms
- API
-
Fast, accurate open-source conversion of PDFs to markdown/JSON, with a hosted API by Datalab.
- Best for
- You want local high-quality PDF to markdown.
- Skip it if
- You need commercial use at a large company without a license.
- Pricing
- Free and open source (license limits for larger companies); hosted API paid unverified editorial summary, not yet confirmed on an official pricing page
- Platforms
- Python SDK · CLI
-
Open-source library and platform that ingests and chunks documents for RAG pipelines.
- Best for
- You need a document ETL pipeline for RAG.
- Skip it if
- You only convert a few files.
- Pricing
- First 10,000 pages free, then $0.015/page pay-as-you-go ✓ verified on the official pricing page, Oct 18, 2026
- Platforms
- API · Python SDK
-
Vision-based document parsing and extraction for complex enterprise documents.
- Best for
- Accuracy on complex tables is critical.
- Skip it if
- You have a small budget.
- Pricing
- $150 free usage, then standard rates (Parse $10/1,000 pages); Growth plan custom ✓ verified on the official pricing page, Oct 18, 2026
- Platforms
- API
Head-to-head comparisons
- Docling vs Mistral OCR
- Docling vs LlamaParse
- Docling vs Marker
- Docling vs Unstructured
- LlamaParse vs Mistral OCR
- Marker vs Mistral OCR
- Mistral OCR vs Unstructured
- LlamaParse vs Marker
- LlamaParse vs Unstructured
- Marker vs Unstructured
FAQ
What is the best AI tool for parsing PDFs and documents for LLMs?
Docling ranks first with 81/100 (A-tier). Open-source document conversion toolkit. Use it when you want free, local document parsing. Next in our ranking: Mistral OCR (77/100, A-tier) and LlamaParse (73/100, A-tier).
Which AI tools for parsing PDFs and documents for LLMs have a free tier?
In our pricing data, Docling (unverified), LlamaParse (verified), Marker (unverified), Unstructured (verified) and Reducto (verified) list a free tier. "Unverified" means it is an editorial summary we have not yet confirmed on the vendor's official pricing page, so check the vendor before relying on it.
Are there open-source options for parsing PDFs and documents for LLMs?
Yes. Docling, Marker and Unstructured are listed as open source or open weights. Check each project's license before commercial use.
How are these tools ranked?
Each tool is scored out of 100 on our public rubric: job fit (30), ease (15), value (15), momentum (15), openness and portability (10), trust and maturity (10) and a builder/gamer bonus (5). S-tier is 85+, A-tier 70–84, B-tier 55–69 and C-tier below 55. Current scores are initial editorial estimates from public information, not hands-on tests, and sponsors can't buy points.