pdfmux

Self-healing PDF extraction that flags the pages it can't read instead of dropping them — and now certifies any extractor's output for silent drops. Open-source LlamaParse alternative for RAG pipelines, MCP server for Claude Desktop, LangChain + LlamaIndex loaders.

pdfmux extracts PDFs and checks its own work — and now certifies any extractor's, telling you which pages it silently dropped. Free, MIT. Patent-pending method. pip install pdfmux.

Two jobs, one tool:

Self-healing extraction. The only PDF extractor that audits its own output. Catches blank pages, scrambled columns, broken tables — re-extracts them with a stronger backend, and flags what it still can't read instead of silently dropping it. So your LLM gets clean data, not silent garbage. Routes each page to the best of 7 built-in extraction backends + BYOK LLM fallback (Gemini / Claude / GPT-4o / Ollama). One CLI. One API. Zero config.
Certify Anything — new in v1.8.1. pdfmux verify audits any extraction engine's output against the source PDF — Reducto, Mistral OCR, LlamaParse, Docling, your in-house parser — and tells you which pages it silently dropped. Free, MIT, patent-clean.

PDF ──> pdfmux router ──> best extractor per page ──> audit ──> re-extract failures ──> Markdown / JSON / chunks
            |
            ├─ PyMuPDF         (digital text, 0.01s/page)
            ├─ OpenDataLoader  (complex layouts, 0.05s/page)
            ├─ RapidOCR        (scanned pages, CPU-only)
            ├─ Docling         (tables, 97.9% TEDS)
            ├─ Surya           (heavy OCR fallback)
            ├─ Marker          (academic papers, neural)
            ├─ Mistral OCR     ($0.002/page, 96.6% tables)
            └─ YOUR LLM        (Gemini / Gemma 4 / Claude / GPT-4o / Ollama / Mistral — BYOK via YAML)

Install

pip install pdfmux

That handles digital PDFs. For any real-world batch, install pdfmux[ocr] too — almost every directory of PDFs has at least one scan, and without OCR those pages return empty text:

pip install "pdfmux[ocr]"             # ⭐ recommended — RapidOCR for scanned pages (~200MB, CPU)

Other backends, by document type:

pip install "pdfmux[tables]"          # Docling — table-heavy docs (~500MB)
pip install "pdfmux[opendataloader]"  # OpenDataLoader — complex layouts (Java 11+)
pip install "pdfmux[marker]"          # Marker — neural extraction for academic papers
pip install "pdfmux[llm]"             # Gemini fallback (default LLM)
pip install "pdfmux[llm-claude]"      # Claude (Sonnet / Opus)
pip install "pdfmux[llm-openai]"      # GPT-4o family
pip install "pdfmux[llm-ollama]"      # Ollama (any local model)
pip install "pdfmux[llm-mistral]"     # Mistral OCR API ($0.002/page)
pip install "pdfmux[llm-all]"         # all LLM providers (incl. Gemma 4 via Gemini key)
pip install "pdfmux[watch]"           # `pdfmux watch <dir>` auto-convert on change
pip install "pdfmux[all]"             # everything

Requires Python 3.11+.

Quick Start

CLI

# zero config — just works
pdfmux convert invoice.pdf
# invoice.pdf -> invoice.md (2 pages, 95% confidence, via pymupdf4llm)

# RAG-ready chunks with token limits
pdfmux convert report.pdf --chunk --max-tokens 500

# cost-aware extraction with budget cap
pdfmux convert report.pdf --mode economy --budget 0.50

# schema-guided structured extraction (5 built-in presets)
pdfmux convert invoice.pdf --schema invoice

# BYOK any LLM for hardest pages
pdfmux convert scan.pdf --llm-provider claude

# use a built-in or saved profile (invoices, receipts, papers, contracts, bulk-rag)
pdfmux convert invoice.pdf --profile invoices

# predict cost before running anything
pdfmux estimate big-report.pdf --llm-provider gemini

# stream pages as NDJSON as they finish (great for long documents)
pdfmux stream report.pdf --quality high

# auto-convert any new PDFs that land in a folder
pdfmux watch ./inbox/ -o ./output/

# diff two extractions side-by-side
pdfmux diff old.pdf new.pdf

# batch a directory — writes manifest.json with per-doc confidence
pdfmux convert ./docs/ -o ./output/

# CI mode: fail the run if any document is below 0.20 confidence
pdfmux convert ./docs/ -o ./output/ --strict --min-confidence 0.20

# pre-flight a directory: which extras do you actually need for THIS batch?
pdfmux doctor --check ./docs/

# results are cached by file hash — re-runs are instant; bypass with --no-cache
pdfmux convert report.pdf --no-cache
pdfmux convert report.pdf --clear-cache

Python

For batch processing, use batch_extract() — not a subprocess.run(['pdfmux', ...]) loop. Same pipeline, no per-file process spawn, handles non-ASCII filenames:

import pdfmux
from pathlib import Path

# Batch extract — yields (path, result) tuples as each PDF completes.
pdfs = list(Path("./inbox").glob("*.pdf"))
for path, result in pdfmux.batch_extract(pdfs, quality="standard"):
    if isinstance(result, Exception):
        print(f"FAILED {path.name}: {result}")
        continue
    if result.confidence < 0.50:
        print(f"REVIEW {path.name} ({result.confidence:.2f})")
    else:
        print(f"OK     {path.name} ({result.confidence:.2f})")

# Single-file helpers.
text   = pdfmux.extract_text("report.pdf")             # markdown string
data   = pdfmux.extract_json("report.pdf")             # locked schema dict
chunks = pdfmux.chunk("report.pdf", max_tokens=500)    # RAG-ready chunks

Don't wrap pdfmux with your own pypdf/pdfplumber fallback. pdfmux already routes per page through PyMuPDF → RapidOCR → vision LLM. PyMuPDF tolerates malformed PDFs that pypdf rejects ("Stream has ended unexpectedly"), so a downstream pypdf fallback turns recoverable PDFs into failures. Trust the router; check the confidence score on the result.

Certify Anything

pdfmux verify audits any extraction engine's output against the source PDF and tells you which pages it silently dropped — not just pdfmux's own extraction. Point it at the output of Reducto, Mistral OCR, LlamaParse, Docling, or your in-house parser and it re-derives the source text with pdfmux's own audit pass, aligns the extraction to it, and scores every page.

The failure it catches: a page where the source has real text but the engine returned nothing — while reporting success. That "silent drop" is the exact failure that poisons a RAG index without a single error in the logs.

# Certify pdfmux's own extraction of a document
pdfmux verify --source report.pdf --engine pdfmux

# Certify ANOTHER engine's output (JSON / Markdown / text)
pdfmux verify --source report.pdf --extracted reducto.json --engine-name reducto

# Batch a whole directory — the "M pages silently dropped across N docs" report
pdfmux verify --source ./pdfs/ --extracted ./engine-outputs/ -o certification.json

# CI gate: exit non-zero unless the overall verdict is PASS
pdfmux verify --source report.pdf --extracted out.json --strict

Every run prints a PASS / REVIEW / FAIL verdict, overall confidence and coverage, and — when it finds them — the silently dropped pages by number:

pdfmux verify — report.pdf · engine: reducto
  FAIL   confidence 71% · coverage 68%
  reducto: FAIL; 3 page(s) SILENTLY DROPPED (pages 7, 12, 31); overall
  confidence 71%, coverage 68% across 40 page(s).

❌ 3 page(s) SILENTLY DROPPED: 7, 12, 31

Per page you get a verdict (pass / review / fail), confidence, coverage, alignment, hallucination-risk, and table/heading integrity. Batch mode rolls that up into a single "N pages silently dropped across M documents" line — the report you run on 100 of your own PDFs to find the silent failures already in your pipeline.

It works on any engine's output

--extracted accepts JSON, Markdown, or plain text (--extracted-format auto | json | markdown | text). When the extraction exposes real per-page structure, pdfmux compares page-by-page; when it's a single blob, it falls back to content-presence checks so it never fabricates a "silent drop" from a pagination mismatch.

Python API

from pdfmux import verify_extraction, verify_batch

# Single document → a CertificationManifest
manifest = verify_extraction("report.pdf", "reducto.json", engine="reducto")
print(manifest.verdict)        # "PASS" | "REVIEW" | "FAIL"
print(manifest.silent_drops)   # e.g. (7, 12, 31)  — 1-indexed page numbers
print(manifest.coverage)       # 0.0–1.0

# Many documents → a BatchCertification ("M pages dropped across N docs")
batch = verify_batch([("a.pdf", "a.json"), ("b.pdf", "b.json")], engine="llamaparse")
print(batch.total_silent_drops, "pages dropped across", batch.doc_count, "docs")

Each manifest carries a tamper-evident SHA-256 content signature over its canonical body and an embedded, honest limitations list: the certifier is lexical, not linguistic — it detects missing and garbled content, not faithful paraphrase or translation.

MCP

verify_extraction is exposed as an MCP tool (the 7th — see MCP Server), so an agent can certify an engine's output in the same session it extracts.

Free, MIT, patent-clean

Certify Anything reuses only pdfmux's shipped MIT audit layer. It does not include, and does not require, the patent-pending decision-trace method — that stays in pdfmux Cloud/Pro. pip install pdfmux gives you the full verify command at no cost.

Full reference: docs/CERTIFY-ANYTHING.md.

Architecture

                           ┌─────────────────────────────┐
                           │     Segment Detector         │
                           │  text / tables / images /    │
                           │  formulas / headers per page │
                           └─────────────┬───────────────┘
                                         │
                    ┌────────────────────────────────────────┐
                    │            Router Engine                │
                    │                                        │
                    │   economy ── balanced ── premium        │
                    │   (minimize $)  (default)  (max quality)│
                    │   budget caps: --budget 0.50            │
                    └────────────────────┬───────────────────┘
                                         │
          ┌──────────┬──────────┬────────┴────────┬──────────┐
          │          │          │                  │          │
     PyMuPDF   OpenData    RapidOCR           Docling     LLM
     digital   Loader      scanned            tables    (BYOK)
     0.01s/pg  complex     CPU-only           97.9%    any provider
               layouts                        TEDS
          │          │          │                  │          │
          └──────────┴──────────┴────────┬────────┴──────────┘
                                         │
                    ┌────────────────────────────────────────┐
                    │           Quality Auditor               │
                    │                                        │
                    │   4-signal dynamic confidence scoring   │
                    │   per-page: good / bad / empty          │
                    │   if bad -> re-extract with next backend│
                    └────────────────────┬───────────────────┘
                                         │
                    ┌────────────────────────────────────────┐
                    │           Output Pipeline               │
                    │                                        │
                    │   heading injection (font-size analysis)│
                    │   table extraction + normalization      │
                    │   text cleanup + merge                  │
                    │   confidence score (honest, not inflated)│
                    └────────────────────────────────────────┘

Key design decisions

Router, not extractor. pdfmux does not compete with PyMuPDF or Docling. It picks the best one per page.
Agentic multi-pass. Extract, audit confidence, re-extract failures with a stronger backend. Bad pages get retried automatically.
Segment-level detection. Each page is classified by content type (text, tables, images, formulas, headers) before routing.
4-signal confidence. Dynamic quality scoring from character density, OCR noise ratio, table integrity, and heading structure. Not hardcoded thresholds.
Document cache. Each PDF is opened once, not once per extractor. Shared across the full pipeline.
Data flywheel. Local telemetry tracks which extractors win per document type. Routing improves with usage.

Features

Feature	What it does	Command
Zero-config extraction	Routes to best backend automatically	`pdfmux convert file.pdf`
RAG chunking	Section-aware chunks with token estimates	`pdfmux convert file.pdf --chunk --max-tokens 500`
Cost modes	economy / balanced / premium with budget caps	`pdfmux convert file.pdf --mode economy --budget 0.50`
Schema extraction	5 built-in presets (invoice, receipt, contract, resume, paper)	`pdfmux convert file.pdf --schema invoice`
Profiles	Save and re-use config; built-ins for invoices/receipts/papers/contracts/bulk-rag	`pdfmux convert file.pdf --profile invoices`
BYOK LLM	Gemini, Gemma 4, Claude, GPT-4o, Ollama, Mistral, any OpenAI-compatible API	`pdfmux convert file.pdf --llm-provider claude`
Cost estimate	Predict spend before running	`pdfmux estimate file.pdf --llm-provider gemini`
Streaming output	NDJSON events page-by-page for long docs	`pdfmux stream file.pdf`
Smart cache	Hash-keyed result cache, 30-day TTL, 1 GB LRU	`pdfmux convert file.pdf` (auto), `--no-cache` to bypass
Watch mode	Auto-convert any PDF added to a folder	`pdfmux watch ./inbox/`
Diff	Compare two extractions	`pdfmux diff a.pdf b.pdf`
Benchmark	Eval all installed extractors against ground truth	`pdfmux benchmark`
Doctor	Show installed backends, coverage gaps, recommendations	`pdfmux doctor`
MCP server	AI agents read PDFs via stdio or HTTP	`pdfmux serve`
Batch processing	Convert entire directories	`pdfmux convert ./docs/`
Page-level streaming API	Bounded-memory page iteration for large files	`for page in ext.extract("500pg.pdf")`
Retry with backoff	Every LLM provider auto-retries with exponential backoff + `Retry-After`	(built-in)

CLI Reference

`pdfmux convert`

pdfmux convert <file-or-dir> [options]

Options:
  -o, --output PATH          Output file or directory
  -f, --format FORMAT        markdown | json | csv | llm (default: markdown)
  -q, --quality QUALITY      fast | standard | high (default: standard)
  -s, --schema SCHEMA        JSON schema file or preset (invoice, receipt, contract, resume, paper)
  --chunk                    Output RAG-ready chunks
  --max-tokens N             Max tokens per chunk (default: 500)
  --mode MODE                economy | balanced | premium (default: balanced)
  --budget AMOUNT            Max spend per document in USD
  --llm-provider PROVIDER    LLM backend: gemini | claude | openai | ollama
  --confidence               Include confidence score in output
  --stdout                   Print to stdout instead of file

`pdfmux serve`

Start the MCP server for AI agent integration.

pdfmux serve              # stdio mode (Claude Desktop, Cursor)
pdfmux serve --http 8080  # HTTP mode

`pdfmux doctor`

pdfmux doctor
# ┌──────────────────┬─────────────┬─────────┬──────────────────────────────────┐
# │ Extractor        │ Status      │ Version │ Install                          │
# ├──────────────────┼─────────────┼─────────┼──────────────────────────────────┤
# │ PyMuPDF          │ installed   │ 1.25.3  │                                  │
# │ OpenDataLoader   │ installed   │ 0.3.1   │                                  │
# │ RapidOCR         │ installed   │ 3.0.6   │                                  │
# │ Docling          │ missing     │ --      │ pip install pdfmux[tables]       │
# │ Surya            │ missing     │ --      │ pip install pdfmux[ocr-heavy]    │
# │ LLM (Gemini)     │ configured  │ --      │ GEMINI_API_KEY set               │
# └──────────────────┴─────────────┴─────────┴──────────────────────────────────┘

`pdfmux benchmark`

pdfmux benchmark report.pdf
# ┌──────────────────┬────────┬────────────┬─────────────┬──────────────────────┐
# │ Extractor        │   Time │ Confidence │      Output │ Status               │
# ├──────────────────┼────────┼────────────┼─────────────┼──────────────────────┤
# │ PyMuPDF          │  0.02s │        95% │ 3,241 chars │ all pages good       │
# │ Multi-pass       │  0.03s │        95% │ 3,241 chars │ all pages good       │
# │ RapidOCR         │  4.20s │        88% │ 2,891 chars │ ok                   │
# │ OpenDataLoader   │  0.12s │        97% │ 3,310 chars │ best                 │
# └──────────────────┴────────┴────────────┴─────────────┴──────────────────────┘

`pdfmux estimate`

Predict spend (and which backends will run) before processing.

pdfmux estimate report.pdf --quality high --llm-provider gemini
# Pages       : 47
# Extractors  : pymupdf4llm + gemini-2.5-flash on 9 pages
# Estimated   : $0.0234
# Cache hit?  : no  (first run for this file)

`pdfmux stream`

Emit NDJSON events as pages complete — useful for very long PDFs and live UIs.

pdfmux stream long.pdf --quality high
# {"event":"classified","page_count":312,"plan":"pymupdf+gemini-fallback"}
# {"event":"page","page_num":0,"confidence":0.97,"chars":1842}
# {"event":"page","page_num":1,"confidence":0.92,"chars":1611,"ocr":true}
# ...
# {"event":"complete","confidence":0.94,"cost_usd":0.0712}

`pdfmux watch`

Auto-convert any PDFs that land in a directory. Survives until Ctrl+C.

pdfmux watch ./inbox/ -o ./output/ --profile bulk-rag

`pdfmux diff`

Side-by-side extraction comparison (quality, content, cost).

pdfmux diff a.pdf b.pdf --quality standard

`pdfmux profiles`

Saved configs at ~/.config/pdfmux/profiles.yaml. Built-ins ship for the common shapes; save your own for project defaults.

pdfmux profiles list
# invoices    quality=standard, schema=invoice, format=json
# receipts    quality=fast,     schema=receipt, format=json
# papers      quality=high,     chunk=true, max_tokens=500
# contracts   quality=high,     schema=contract
# bulk-rag    quality=standard, format=llm, chunk=true

pdfmux profiles show invoices
pdfmux profiles save my-default --quality high --format llm --chunk
pdfmux profiles delete my-default

# use a profile when converting
pdfmux convert file.pdf --profile invoices

Python API

Text extraction

import pdfmux

text = pdfmux.extract_text("report.pdf")                    # -> str (markdown)
text = pdfmux.extract_text("report.pdf", quality="fast")    # PyMuPDF only, instant
text = pdfmux.extract_text("report.pdf", quality="high")    # LLM-assisted

Structured extraction

data = pdfmux.extract_json("report.pdf")
# data["page_count"]   -> 12
# data["confidence"]   -> 0.91
# data["ocr_pages"]    -> [2, 5, 8]
# data["pages"][0]["key_values"]  -> [{"key": "Date", "value": "2026-02-28"}]
# data["pages"][0]["tables"]      -> [{"headers": [...], "rows": [...]}]

RAG chunking

chunks = pdfmux.chunk("report.pdf", max_tokens=500)
for c in chunks:
    print(f"{c['title']}: {c['tokens']} tokens (pages {c['page_start']}-{c['page_end']})")

Schema-guided extraction

data = pdfmux.extract_json("invoice.pdf", schema="invoice")
# Uses built-in invoice preset: extracts date, vendor, line items, totals
# Also accepts a path to a custom JSON Schema file

Streaming (bounded memory)

from pdfmux.extractors import get_extractor

ext = get_extractor("fast")
for page in ext.extract("large-500-pages.pdf"):  # Iterator[PageResult]
    process(page.text)  # constant memory, even on 500-page PDFs

Types and errors

from pdfmux import (
    # Enums
    Quality,              # FAST, STANDARD, HIGH
    OutputFormat,         # MARKDOWN, JSON, CSV, LLM
    PageQuality,          # GOOD, BAD, EMPTY

    # Data objects (frozen dataclasses)
    PageResult,           # page: text, page_num, confidence, quality, extractor
    DocumentResult,       # document: pages, source, confidence, extractor_used
    Chunk,                # chunk: title, text, page_start, page_end, tokens

    # Errors
    PdfmuxError,          # base -- catch this for all pdfmux errors
    FileError,            # file not found, unreadable, not a PDF
    ExtractionError,      # extraction failed
    ExtractorNotAvailable,# requested backend not installed
    FormatError,          # invalid output format
    AuditError,           # audit could not complete
)

Framework Integrations

LangChain

pip install langchain-pdfmux

from langchain_pdfmux import PDFMuxLoader

loader = PDFMuxLoader("report.pdf", quality="standard")
docs = loader.load()  # -> list[Document] with confidence metadata

LlamaIndex

pip install llama-index-readers-pdfmux

from llama_index.readers.pdfmux import PDFMuxReader

reader = PDFMuxReader(quality="standard")
docs = reader.load_data("report.pdf")  # -> list[Document]

MCP Server (AI Agents)

Listed on mcpservers.org. One-line setup:

{
  "mcpServers": {
    "pdfmux": {
      "command": "npx",
      "args": ["-y", "pdfmux-mcp"]
    }
  }
}

Or via Claude Code:

claude mcp add pdfmux -- npx -y pdfmux-mcp

Tools exposed: convert_pdf, analyze_pdf, extract_structured, extract_streaming, get_pdf_metadata, batch_convert.

BYOK LLM Configuration

pdfmux supports any LLM via 5 lines of YAML. Bring your own keys -- nothing leaves your machine unless you configure it to.

# ~/.pdfmux/llm.yaml
provider: claude          # gemini | claude | openai | ollama | any OpenAI-compatible
model: claude-sonnet-4-20250514
api_key: ${ANTHROPIC_API_KEY}
base_url: https://api.anthropic.com  # optional, for custom endpoints
max_cost_per_page: 0.02   # budget cap

Supported providers:

Provider	Models	Local?	Cost
Gemini	2.5 Flash, 2.5 Pro	No	~$0.01/page
Gemma 4	27B IT, 12B IT (great for Arabic)	No (via Gemini key)	~$0.005/page
Claude	Sonnet, Opus	No	~$0.015/page
GPT-4o	GPT-4o, GPT-4o-mini	No	~$0.01/page
Mistral	`mistral-ocr-latest`	No	$0.002/page
Ollama	Any local model	Yes	Free
Custom	Any OpenAI-compatible API	Configurable	Varies

Every provider's extract_page() is wrapped in @with_retry(max_attempts=3, backoff_base=2.0), which honors Retry-After headers on 429s and skips retries on auth failures so a bad key fails fast.

Arabic & RTL Support

pdfmux ships first-class support for Arabic, Persian, Urdu, and Hebrew. Out of the box, RTL detection runs on every PDF and PyMuPDF-extracted pages are passed through the Unicode Bidirectional Algorithm so glyphs that were stored in left-to-right order render in correct reading order.

# Default install — already includes python-bidi for RTL reordering
pip install pdfmux

# Recommended for Arabic-heavy docs — adds Gemma 4 vision OCR
pip install "pdfmux[arabic,llm-gemma]"

# One credential covers Gemma + Gemini (same Google endpoint)
export GEMINI_API_KEY=...

What happens automatically:

pdfmux convert detects Arabic content and routes pages with >5% Arabic characters through the Arabic-aware extractor chain.
PyMuPDF, RapidOCR, and Docling outputs are post-processed with the Bidi algorithm — markdown headings (#) and pipe-table rows preserve structure, only inner text is reordered.
DocumentResult.has_arabic is set to True whenever any page contains Arabic script.

What requires opt-in:

Vision LLM extraction. Set --llm-provider gemma (or any vision provider) to route Arabic pages through Gemma 4 instead of PyMuPDF.
Aggressive normalization (Tatweel removal, Alef/Yeh unification, Tashkeel stripping) — call pdfmux.arabic.normalize_arabic(text) on extracted strings if you need canonicalized output for search or embedding.

from pdfmux.arabic import (
    is_arabic_text,
    is_rtl_dominant,
    fix_bidi_order,
    normalize_arabic,
)

text = "مرحبا بالعالم"
assert is_arabic_text(text)
assert is_rtl_dominant(text)

# Fix glyph order from PyMuPDF / OCR engines
visual = fix_bidi_order(text)

# Canonicalize for indexing — strip Tatweel, unify Alef variants, drop diacritics
indexable = normalize_arabic("أَحْمَدْ")  # → "احمد"

Proof: a real customer batch

We measured pdfmux on 433 real customer documents — technical and safety data sheets, mixed digital and scanned, some encoding-corrupted. Run the naive way first (an early pdfmux CLI in a subprocess, pypdf fallback, no OCR), the pipeline silently dropped 16 documents — 11 of them with no log line at all. That was our own tool failing at the exact thing it promises.

Rebuilt with the per-page audit + budgeted OCR cascade: 433 of 433 processed, zero silent failures. Every unrecoverable page is flagged, not dropped.

(A small internal confidence-calibration set also ships under eval/ — it's a regression guard on the confidence gate, not a competitive benchmark; see eval/README.md.)

Benchmark

On opendataloader-bench — 200 real-world PDFs (financial filings, academic papers, legal contracts, government reports) — pdfmux 1.8.2 scores 0.903 overall: #2 of all tools, and #1 among free / open-source libraries, behind only the paid hybrid engine. Re-run 2026-07-16 (reproduction below).

Rank	Engine	Overall	Reading order	Tables (TEDS)	License	GPU
1	opendataloader-hybrid (paid)	0.909	0.935	0.928	Commercial	API
2	pdfmux	0.903	0.920	0.911	MIT	No
3	Docling	0.877	0.900	0.887	MIT	Optional
4	marker	0.861	0.890	0.808	free	GPU
5	mineru	0.831	0.857	0.873	free	GPU

Full per-document scores: the 200-PDF head-to-head · methodology: best PDF extraction library, benchmarked.

Smart Result Cache

Re-running the same extraction is instant. pdfmux hashes every input PDF (SHA-256) and keys results on (file_hash, quality, format, schema). Cache files live under ~/.cache/pdfmux/results/, expire after 30 days, and are LRU-evicted at 1 GB.

pdfmux convert big-report.pdf            # first run: 14.2s
pdfmux convert big-report.pdf            # cache hit: 0.05s
pdfmux convert big-report.pdf --no-cache # bypass cache (still writes back)
pdfmux convert big-report.pdf --clear-cache  # purge and re-run

The cache also speeds up --profile, --schema, and --format switches — each combination is keyed independently, so you can flip between Markdown and JSON for the same document for free after the first extraction.

Confidence Scoring

Every result includes a 4-signal confidence score:

95-100% -- clean digital text, fully extractable
80-95% -- good extraction, minor OCR noise on some pages
50-80% -- partial extraction, some pages unrecoverable
<50% -- significant content missing, warnings included

When confidence drops below 80%, pdfmux tells you exactly what went wrong and how to fix it:

Page 4: 32% confidence. 0 chars extracted from image-heavy page.
  -> Install pdfmux[ocr] for RapidOCR support on 6 image-heavy pages.

Cost Modes

Mode	Behavior	Typical cost
economy	Rule-based backends only. No LLM calls.	$0/page
balanced	LLM only for pages that fail rule-based extraction.	~$0.002/page avg
premium	LLM on every page for maximum quality.	~$0.01/page

Set a hard budget cap: --budget 0.50 stops LLM calls when spend reaches $0.50 per document.

Why pdfmux?

pdfmux is not another PDF extractor. It is the orchestration layer that picks the right extractor per page, verifies the result, and retries failures.

Tool	Good at	Limitation
PyMuPDF	Fast digital text	Cannot handle scans or image layouts
Docling	Tables (97.9% accuracy)	Slow on non-table documents
Marker	Neural extraction for academic papers	Needs GPU for speed; overkill for digital PDFs
Mistral OCR	Tables (96.6% TEDS), $0.002/page	Cloud-only API
Unstructured	Enterprise platform	Complex setup, paid tiers
LlamaParse	Cloud-native	Requires API keys, not local
Reducto	High accuracy	$0.015/page, closed source
pdfmux	Orchestrates all of the above	Routes per page, audits, re-extracts

Open source Reducto alternative: what costs $0.015/page elsewhere is free with pdfmux's rule-based backends, or ~$0.002/page average with BYOK LLM fallback.

Development

git clone https://github.com/NameetP/pdfmux.git
cd pdfmux
python3.12 -m venv .venv && source .venv/bin/activate
pip install -e ".[dev]"

pytest              # 659 tests
ruff check src/ tests/
ruff format src/ tests/

Contributing

Fork the repo
Create a branch (git checkout -b feature/your-feature)
Write tests for new functionality
Ensure pytest and ruff check pass
Open a PR

License

The pdfmux library and MCP server in this repository are MIT licensed — free for any use, and every released version stays MIT.

The confidence-budgeted decision-trace method (the persisted per-page decision trace with retained rejected candidates, and the monotonic repair guard) is patent-pending (US Provisional App No. 64/106,302) and is reserved for pdfmux Cloud/Pro under a separate commercial license — it is not part of the MIT grant. See LICENSING.md and NOTICE.

Pdfmux

README

pdfmux

Install

Quick Start

CLI

Python

Certify Anything

It works on any engine's output

Python API

MCP

Free, MIT, patent-clean

Architecture

Key design decisions

Features

CLI Reference

pdfmux convert

pdfmux serve

pdfmux doctor

pdfmux benchmark

pdfmux estimate

pdfmux stream

pdfmux watch

pdfmux diff

pdfmux profiles

Python API

Text extraction

Structured extraction

RAG chunking

Schema-guided extraction

Streaming (bounded memory)

Types and errors

Framework Integrations

LangChain

LlamaIndex

MCP Server (AI Agents)

BYOK LLM Configuration

Arabic & RTL Support

Proof: a real customer batch

Benchmark

Smart Result Cache

Confidence Scoring

Cost Modes

Why pdfmux?

Development

Contributing

License

Comments (0)

`pdfmux convert`

`pdfmux serve`

`pdfmux doctor`

`pdfmux benchmark`

`pdfmux estimate`

`pdfmux stream`

`pdfmux watch`

`pdfmux diff`

`pdfmux profiles`