PDF to HTML in Python

Overview

Convert PDF documents to HTML with the PDFCrowd Python client. The client handles communication with the API, while conversions run on PDFCrowd's servers.

Installation

Install the Python client with pip, or see other installation options.

python -m pip install pdfcrowd

Quick Start

You can run the examples below with the displayed API credentials. Update the input URLs and filenames as needed.

import pdfcrowd

client = pdfcrowd.PdfToHtmlClient('demo', 'demo')

client.convertUrlToFile('https://your-server.com/invoice.pdf', 'invoice.html')

import pdfcrowd

client = pdfcrowd.PdfToHtmlClient('demo', 'demo')

client.convertFileToFile('logo.pdf', 'logo.html')

Configure a Conversion

Authentication

Pass your PDFCrowd username and API key to PdfToHtmlClient. Find your credentials on the API Keys page.

Choose an Input

Send a PDF URL, upload a local file, or pass PDF bytes or a readable binary stream.

Add Conversion Settings

Set conversion options on the client before calling a conversion method. For example, client.setScaleFactor(150) enlarges the HTML page layout by a factor of 1.5.

Common settings are listed below. See the method reference for all available options or browse Python examples.

The PDF password unlocks the input document; it is separate from your PDFCrowd API key.

Handle the Result

Choose an Output

By default, images, CSS and fonts are embedded in a single HTML file. The result preserves the PDF page layout; it does not reconstruct the original source HTML or create a responsive design.

The methods below use URL input; local files, bytes, and input streams have corresponding methods.

See the reference for file and stream handling.

Convert a PDF to HTML and return the result as bytes:

import pdfcrowd

client = pdfcrowd.PdfToHtmlClient('demo', 'demo')

data = client.convertUrl('https://your-server.com/invoice.pdf')
print(f"Received {len(data)} bytes")

Setting an image, CSS or font mode to "separate" produces a ZIP archive with the HTML and its resources. Save that result with a .zip extension, then extract it while retaining the relative directory structure. isZippedOutput() reports whether the selected settings produce a ZIP archive.

When serving the result from a web application, use text/html; charset=utf-8 for HTML or application/zip for an archive.

Handle Errors

The client raises a pdfcrowd.Error exception on conversion or validation errors. This example converts a PDF to HTML and logs any PDFCrowd error, including its HTTP status and reason code:

import logging
import pdfcrowd

client = pdfcrowd.PdfToHtmlClient('demo', 'demo')

try:
    client.convertUrlToFile(
        'https://your-server.com/invoice.pdf', 'invoice.html'
    )
except pdfcrowd.Error as error:
    logging.error("PDFCrowd: %s", error)
    logging.error("Status: %s; reason: %s",
                  error.getStatusCode(), error.getReasonCode())
    raise

Local Python errors, such as a failure to read an input file or write the output, may need separate handling.

See the error-object reference for status, reason, and message accessors.

str(error) returns the complete error, including available status and reason codes.

Common Status Codes

See all status and reason codes for specific explanations and Limits and Retries for retry behavior.

For job IDs, credit usage, and other conversion details, see the reference.

Limits and Retries

Request rate and concurrency limits depend on your license. Control how quickly your application submits conversions and how many it runs at once. A 429 response concerns request rate; a 430 response concerns requests already in progress. The maximum upload size is 300 MB.

The Python client automatically retries a request once when it receives HTTP 502 or 503. Use setRetryCount() to change that count, or set it to 0 to disable automatic retries. Account for these retries when adding an application-level retry policy.

Troubleshooting

Inspect a Conversion

This example converts a PDF to HTML with debug logging enabled and records the debug log URL when available. Use the input and settings from the conversion you are investigating.

import logging
import pdfcrowd

logging.basicConfig(level=logging.INFO)

client = pdfcrowd.PdfToHtmlClient('demo', 'demo')

try:
    client.setDebugLog(True)
    client.convertUrlToFile(
        'https://your-server.com/invoice.pdf', 'invoice.html'
    )
except pdfcrowd.Error as error:
    logging.error("PDFCrowd: %s", error)
    logging.error("Status: %s; reason: %s",
                  error.getStatusCode(), error.getReasonCode())
    raise
finally:
    if client.getDebugLogUrl():
        logging.info("Debug log: %s", client.getDebugLogUrl())

The debug log contains conversion settings and processing details. You can also find logs in your conversion history. A local or connection failure may occur before a conversion log is available.

Common Problems

For help, contact support and include any available diagnostics, the client version, and enough detail to reproduce the problem.