pdfluent

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PDFluent for Python: a pure-Rust PDF SDK with no system dependencies, from a single pip install.

Render pages, extract text, fill forms, annotate, redact, encrypt, merge, and validate PDF/A — all from a single pip install.

Installation

pip install pdfluent

# Optional extras
pip install pdfluent[pillow]   # PIL Image support
pip install pdfluent[numpy]    # NumPy array support

Requires Python ≥ 3.8. Pre-built wheels for Linux (x86_64, aarch64), macOS (x86_64, arm64), and Windows (x86_64).

Quick Start

from pdfluent import Document

# Open, inspect, render
with Document("invoice.pdf") as doc:
    print(f"{doc.page_count} pages — {doc.metadata.title}")

    img = doc[0].render(dpi=150)
    img.save("page_0.png")          # requires Pillow

# Extract text
doc = Document("report.pdf")
for page in doc:
    print(page.extract_text())

# Fill a form field and save
doc = Document("form.pdf")
doc.set_form_field("Name", "Jane Doe")
# Multi-select list box: select several options at once
doc.set_multi_select("Languages", ["EN", "NL"])
doc.save("form_filled.pdf")

# Search-and-redact
doc = Document("contract.pdf")
report = doc.redact_text("Confidential")
print(f"Redacted {report.areas_redacted} areas on {report.pages_affected} pages")
doc.save("contract_redacted.pdf")

# PDF/A validation
from pdfluent import validate_pdfa

report = validate_pdfa("archive.pdf")
if report.is_compliant:
    print(f"✓ {report.pdfa_level} compliant")
else:
    for issue in report.issues:
        print(f"[{issue.severity}] {issue.rule}: {issue.message}")

# Merge PDFs
from pdfluent import merge_pdfs
merge_pdfs(["a.pdf", "b.pdf", "c.pdf"], "merged.pdf")

# Encrypt / decrypt
doc = Document("sensitive.pdf")
doc.encrypt("sensitive_enc.pdf", password="s3cr3t")

from pdfluent import decrypt_pdf
decrypt_pdf("sensitive_enc.pdf", "sensitive_dec.pdf", password="s3cr3t")

Features

API Overview

Document(source, password=None)

Opens a PDF from a file path (str) or raw bytes.

doc = Document("file.pdf")             # from path
doc = Document(open("file.pdf","rb").read())  # from bytes
doc = Document("encrypted.pdf", password="pw")

Properties: page_count, metadata, bookmarks
Methods: render_all(dpi), search(query), extract_text(page_num), save(path), get_form_fields(), set_form_field(name, value), get_annotations(page), add_annotation(page, type, rect, content), redact_text(term, page=None), encrypt(path, password), decrypt(path, password)
Protocols: len(doc), doc[0], for page in doc, with Document(...) as doc

AcroForm fill behaviour

set_form_field(name, value) supports text, checkbox, radio, and choice (combo/list) fields. Hierarchical names ("parent.child") are resolved through /Kids recursion. Every call keeps /V, /AS, and /AP consistent so the fill is visible in all PDF viewers without needing /NeedAppearances processing.

doc.set_form_field("Name", "Jane Doe")          # text field
doc.set_form_field("Agree", "On")               # checkbox — pass on-state name
doc.set_form_field("Country", "NL")             # radio group — export value
doc.set_form_field("Category", "Urgent")        # combo / list — option value
doc.save("form_filled.pdf")

Read-only fields raise PdfluentError.

Page

Properties: index, width, height, rotation, geometry
Methods: render(dpi, width, height, background), thumbnail(max_dimension), extract_text(), extract_text_blocks()

RenderedImage

Properties: width, height, pixels (raw RGBA bytes)
Methods: to_pil(), to_numpy(), save(path)

TextSpan

Structured text with position data.

Properties: text, x, y, font_size
Font metadata (optional): font_name, is_bold, is_italic, color

These fields return None in the current release. They are typed as Optional so downstream code handles the None case correctly today and will receive data once font-metadata extraction lands.

for block in page.extract_text_blocks():
    for span in block.spans:
        if span.font_name is not None:
            print(f"{span.font_name} {'bold' if span.is_bold else ''}")
        print(f"  '{span.text}' @ ({span.x:.1f}, {span.y:.1f})")

Module-level functions

Exception Hierarchy

Every pdfluent-specific error derives from PdfluentError, so a single except PdfluentError: clause catches all library errors:

from pdfluent import PdfluentError, PdfluentParseError, PdfluentEncryptedError

try:
    with Document("broken.pdf") as doc:
        doc.render_all()
except PdfluentParseError as exc:
    print(f"Not a valid PDF: {exc}")
except PdfluentEncryptedError:
    print("PDF is password-protected")
except PdfluentError as exc:
    print(f"PDF error: {exc}")

Full hierarchy:

PdfluentError                 — base; catch all pdfluent errors
├── PdfluentParseError        — corrupt / non-PDF bytes
├── PdfluentValidationError   — schema / compliance failures
├── PdfluentRenderError       — rendering and XFA flatten failures
├── PdfluentEncryptedError    — operation blocked by encryption
├── PdfluentPageRangeError    — page index out of range
├── PdfluentIoError           — file-system I/O errors
├── PdfluentGeometryError     — invalid page geometry
└── PdfluentLimitError        — processing-limit exceeded

Typing Support

pdfluent ships with hand-written .pyi stub files for IDE completion and mypy --strict compatibility:

• pdfluent/__init__.pyi — full public API stubs
• pdfluent/_native.pyi — native extension stubs (for mypy without a build)

Verifying with mypy

pip install mypy
cd crates/pdf-python
mypy --strict --python-path python tests/test_pdfluent_typing.py

Example with typed annotations

from __future__ import annotations
from typing import Optional
from pdfluent import Document, TextSpan, PdfluentError

def get_font(span: TextSpan) -> Optional[str]:
    """Return the font name if available."""
    return span.font_name   # Optional[str] — mypy knows this may be None

def safe_open(path: str) -> Optional[Document]:
    try:
        return Document(path)
    except PdfluentError:
        return None

Licence

AGPL-3.0 or a commercial licence, at your option. The AGPL is the default and the complete product: there is no licence key, no activation call and no tier, and every feature works in every build. If you cannot accept the copyleft obligation, the commercial licence is sold yearly and self-service at pdfluent.com/sdk/pricing, in four options: Commercial (per organisation), OEM Startup and OEM (per product), and Priority support (an add-on). The two texts are LICENSE and LICENSE-COMMERCIAL in this crate.

Building from Source

Requires a Rust toolchain and maturin.

pip install maturin
cd crates/pdf-python
maturin develop --release          # install in current venv
maturin build --release            # build wheel in ./dist/

Links

• Documentation: https://pdfluent.com/docs
• Pricing: https://pdfluent.com/sdk/pricing
• PDFluent editor (source-available): https://github.com/pdfluent/pdfluent. The free desktop app this SDK powers.
• Built by Innovation Trigger BV