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Convert EML and MSG Emails to PDF in C#, Python, and Node.js

Convert emails to PDF as part of a pipeline: headers rendered, attachments converted and merged into one document, and optional PDF/A output for regulated archives. Working C#, Python, and Node.js code with real input and output files to download.

2026 Aug 19 Tomas

Microsoft Publisher end of life: convert .pub files to PDF before October 2026

Microsoft Publisher reaches end of life on October 13, 2026, and Microsoft 365 versions will stop opening .pub files entirely. Learn what the retirement means, which replacement tools to consider, and how to batch convert your Publisher archive to PDF with a single API call.

2026 Aug 18 Tomas

PDF/A for E-Invoicing: How to Archive Factur-X and ZUGFeRD Invoices

How PDF/A archiving works for e-invoices: which PDF/A version to pick, how Factur-X and ZUGFeRD embed structured XML in a PDF, and how to automate the conversion in your invoicing workflow with working cURL and C# examples.

2026 Aug 18 Tomas

Convert Files to PDF in Node.js: DOCX, HTML, Markdown (and Back)

The conversions Node.js backends actually need. Convert DOCX, HTML, and Markdown to PDF. Turn PDF back into JPG images or editable Word, Excel, and PowerPoint files. Every example has working SDK code and real sample files to download.

2026 Aug 17 Tomas

How to Convert ZUGFeRD and Factur-X to Peppol BIS Billing 3.0 (UBL XML)

Generate ZUGFeRD or Factur-X but need to send over Peppol? Convert the embedded CII XML to Peppol BIS Billing 3.0 UBL - from a PDF or raw XML - with one API call.

2026 Aug 14 Paulius

Flatten vs Rasterize a PDF: What's the Difference?

Flattening and rasterizing both make a PDF read-only, but they are not the same: one keeps the document vector-sharp, the other turns pages into pixels. See the real difference in quality and file size, with before-and-after files you can download.

2026 Aug 13 Tomas

How to Flatten a PDF in C# (Forms, Annotations, and Text)

Flatten a filled-out PDF form in C# so nothing can be changed: lock form fields, freeze annotations and signature fields, and stop text from being copied - with a complete working example and an option reference.

2026 Aug 13 Tomas

How to Split a PDF in C#: 4 Methods Compared (2026 Guide)

Compare the four practical ways to split PDF files in C# and .NET: iText 7, PdfSharp, Aspose.PDF, and the ConvertAPI REST service - with working code, honest limitations, and a decision table covering bookmark, regex, and range splits.

2026 Jul 20 Tomas

How to convert files from the command line

Learn how to convert files from the command line: a curl one-liner that works on Linux, macOS, and Windows, Bash batch loops, native PowerShell, the ConvertAPI CLI tool, and an honest look at LibreOffice and pandoc trade-offs.

2026 Jul 20 Tomas

How to convert DICOM files to JPG, PNG, and PDF

Learn how to convert DICOM (.dcm) medical images to JPG, PNG, and PDF programmatically. Windowing and compressed transfer syntaxes are handled automatically, multi-frame series become multi-page PDFs, and PDF/A output covers regulatory archiving.

2026 Jul 17 Tomas

Convert PDF to Word, Excel, and PowerPoint programmatically

Learn how to convert PDF files to editable Word, Excel, and PowerPoint documents programmatically. Extract tables to spreadsheets, convert scanned PDFs with built-in OCR, and control layout fidelity, with code samples in Python and C#.

2026 Jul 16 Kostas

How to delete PDF pages programmatically

Learn how to delete PDF pages programmatically. Remove single pages and page ranges, or detect and drop blank scan pages automatically, with ready-to-run code samples in C#, Python, Node.js, PHP, and Java.

2026 Jul 16 Kostas

How to compress PDF files programmatically

Learn how to compress PDF files programmatically. Choose a compression preset or fine-tune image downsampling, object cleanup, and font optimization, with ready-to-run code samples in C#, Python, Node.js, PHP, and Java.

2026 Jul 16 Kostas

Improve performance with a custom file conversion workflow

ConvertAPI provides a flexible solution for building custom conversion flows. You can process your files by applying multiple conversions and other file manipulations using conversion chaining. This best-practice driven REST API approach improves performance and gives you full control over file processing at any stage of the flow.

2026 Jul 15 Kostas

How to Programmatically Validate PDF/A Compliance: 4 Methods Compared

Validate PDF/A files programmatically with code examples in C#, Python, Java, and Node.js. Compare veraPDF, Adobe Preflight, and ConvertAPI PDF/A validators.

2026 May 05 Tomas

How to Convert DOCX to PDF in C#: 4 Methods Compared (2026 Guide)

Learn how to convert DOCX to PDF in C# with four proven methods. Compare Microsoft Interop, Open XML, ConvertAPI, and Aspose with code examples, benchmarks, and edge case solutions.

2026 Mar 26 Paulius

Inside ConvertAPI’s Security and Compliance Architecture

A transparent look at ConvertAPI’s security architecture - from in-memory processing to strict isolation, ISO 27001, SOC 2 certification GDPR compliance, and zero data persistence.

2026 Mar 24 Henrikas

How to Add Page Numbers to PDF

Learn how to add page numbers to PDF files programmatically in PHP, C#, and Node.js using the Text Watermark API with %PAGE% and %PAGES% variables and precise positioning.

2026 Jan 27 Paulius

How to Merge PDF Files in C# (.NET) with ConvertAPI – Examples & Tutorial

Learn how to merge PDF files in C# using ConvertAPI. Step-by-step tutorial with code examples for .NET developers. Covers PDF merging, bookmarks, page orientation, page size, and more.

2025 Sep 24 Tomas

Introducing the ConvertAPI ChatGPT Plugin

The ConvertAPI ChatGPT plugin is now live! Easily convert files like DOCX, PDF, and images within ChatGPT - no external tools needed. Try it free in the GPT Store!

2025 Aug 08 Paulius

Extract Data from PDF Documents Using AI

Harness the power of AI to extract crucial data from documents like invoices, receipts, and forms with accuracy and speed.

2025 Apr 28 Paulius

Automate File Conversions Using n8n.io

Discover how to seamlessly integrate the ConvertAPI service with n8n.io for efficient document conversions. This detailed guide includes setup instructions and practical examples to optimize your n8n workflows with robust document processing features.

2024 Jun 25 Jonas

Bubble.io Document Conversion Guide

Learn how to use the ConvertAPI plugin for Bubble.io to handle document conversions effortlessly. This comprehensive guide covers installation, setup, and practical examples to enhance your Bubble applications with powerful document processing capabilities.

2024 Jun 12 Jonas

Document and file conversion library for Java

ConvertAPI provides a flexible solution for building custom conversion flows. You can process your files by applying multiple conversions and compress the result PDF afterward. This best-practice-driven REST API approach improves performance and gives you full control over file compression levels and parameters.

2024 Mar 08 Shanika

Generate DOCX and PDF from code using a Word template

Agreements, invoices, and NDAs take time and resources. Automate most manual work by generating documents from a DOCX template combined with a JSON object containing your data.

2023 Dec 22 Kostas

Asynchronous File Conversion Using Polling in C#

Explore our comprehensive guide on how to leverage ConvertAPI for asynchronous file conversions in C#. Learn to submit, track, and save your conversion tasks in a non-blocking manner, enhancing your .NET application's performance.

2023 Nov 30 Tomas

Temporary file storage techniques and benefits

Temporary file storage allows performing multiple parallel conversions without performance loss and empowers conversion chaining to create a seamless workflow without redundant file transferring back and forth.

2023 Aug 25 Jonas

Page Breaks in HTML to PDF Conversion

Our HTML to PDF converter provides an alternative solution for generating beautiful PDFs with dynamic content layouts, without the need to learn new tools or libraries. Leveraging the battle-tested HTML and CSS, you can easily utilize your existing knowledge in these technologies to create stunning PDFs.

2023 Jul 05 Jonas

HTTP Request and Response Content Types - Making the Right Choice

HTTP request and response content types are used in the Hypertext Transfer Protocol (HTTP) to specify the format of the data being sent or received. They help servers and clients understand how to interpret the exchanged information.

2023 Jun 16 Jonas

How to process a multi-file conversion result on Zapier?

The ConvertAPI app on Zapier is becoming highly popular, and many customers are extending their workflows using our service that offers a broad file type conversion support. It is super easy to set up; however, there are some nuances that may be taken into consideration to take full advantage of the service. In this article, we will explain how to process a multi-file response returned of the ConvertAPI conversion.

2022 Oct 04 Kostas

Create online PDF converter using JS

Online PDF converters are becoming extremely popular and useful tools these days. In this article, we will demonstrate an example of how to create an online PDF converter using only HTML, CSS, and JavaScript.

2022 Apr 12 Kostas

Convert DOCX to HTML programmatically with inlined images

Did you know that web pages can be generated from an MS Office Word document? ConvertAPI allows you to convert DOCX to HTML that can be viewed inside a browser without installing any additional software. In this article we present a new feature, that allows embedding all images into a single HTML file.

2022 Feb 24 Kostas

Convert MS Office documents to PDF using PHP

ConvertAPI helps convert MS Office documents to many file types including PDF. In this article we will show how to quickly implement DOCX, XLSX and PPTX conversions to PDF into your projects using our SDK for PHP programming language.

2022 Feb 16 Kostas

Save Excel as CSV without losing Unicode characters

Exporting data from your Excel file to CSV can get tricky, especially if your data contains special unicode characters. In this article, we will explain how to export your XLSX file to CSV using Microsoft Office Excel Interop while preserving the UTF-8 encoded characters.

2021 Nov 16 Kostas

Apply watermark to PDF programatically

When working with documents, you might want to watermark them at some point. Some of the widespread use cases include marking invoices as paid, watermarking documents as a copy or a draft, etc. Our fast and secure ConvertAPI library allows you easily apply custom watermarks to your PDF using any programming language of your choice.

2021 Feb 18 Kostas

How to convert HTML + CSS to PDF using PHP?

It can be a real struggle when trying to convert an HTML file or a web page to a PDF document using PHP. Many developers worldwide choose to leave the complex logic for a 3rd party service specializing in this field to keep the project clean and easy to maintain. Using our ConvertAPI PHP library the conversion can be done in just a couple lines of code.

2020 Dec 30 Kostas

Convert a list of images to a PDF document using Python

Having the ability to control all document conversions from a single place is a relief both for developers as well as project managers. This article shows how simple it is to configure and use our Python ConvertAPI library to create a PDF document from multiple images like jpg, png, webp, bmp, gif and others as well as chaining the conversions into a single workflow for all performance benefits.

2020 Dec 30 Kostas

How we save our time by automating documents flow on Zapier

Many companies, including our own, have hundreds of documents to review, edit, and archive every month. Our ConvertAPI app on Zapier allows you to connect your document repositories from Google Drive or Dropbox to our file processing service and automate your daily tasks at ease. See it in action with our real-life example.

2020 Jul 01 Kostas

Save page as PDF

The PDF button makes it easy for your users to save your web site pages as PDF files. There are two types of button - one for public pages, and another one for private pages.

2020 Mar 24 Jonas

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