In document translation, localization, print production, or large language model (RAG) workflows, you may regularly receive files with the .idml extension.
If you do not have Adobe InDesign installed—or do not work with desktop publishing software—being asked to “get the text out of this file” or “translate this file” can be frustrating.
This article explains what IDML is and how to automatically extract text from IDML files as plain text or structured Markdown without installing any layout software.
What Is an IDML File? How Is It Different from INDD?
INDD (.indd) is InDesign’s native project file format. It is a binary format that stores the details of a brochure, magazine, or other layout project. One limitation is version compatibility: an INDD file saved in InDesign 2024 may not open in InDesign 2023.
To improve compatibility and make files easier for third-party software to process, Adobe introduced IDML (InDesign Markup Language). IDML is essentially a packaged ZIP archive containing XML files. Those XML files use structured markup to describe pages, colors, fonts, and text content.
Because it uses an open XML-based structure, CAT tools such as Trados and Phrase, along with many automation tools, can read and modify IDML without launching InDesign.
Why Is It Difficult to Extract Text from IDML?
Although IDML is XML-based, renaming the file extension to .zip and unzipping it reveals a fairly complex structure.
- Fragmented content: Text is not stored as one continuous document. It is distributed across multiple XML files and must be reorganized into readable content.
- Nested style tags: A simple sentence may contain character styles, paragraph styles, kerning adjustments, and other formatting information interwoven with the actual text.
- Reading-order reconstruction: The order of content in XML often does not match how people read a page—from top to bottom and left to right. The page layout must be interpreted to restore a useful reading order.
If you try to parse these XML files directly with a script, the extracted output is often out of order and cluttered with formatting markup.
How to Extract Content from IDML or INDD in One Step—Without Installing Software
SimplifyAI’s cloud document workspace is designed to process complex layout files. It supports IDML as well as original INDD files directly.
You do not need to install Adobe software or write complex Python scripts:
- Upload your file: Sign in to SimplifyAI and drag in your
.idmlor.inddfile. - Choose an extraction output: In the processing workflow, select the option to extract and download Markdown.
- Download cleaner text: The platform processes the document layout in the cloud and organizes text that is scattered across the file into an order that is easier to read.
SimplifyAI also aims to preserve the document’s structural hierarchy. Main headings can be converted into Markdown # Heading, while lists can be converted into Markdown - List item.
Use Extracted Text for RAG or an AI Knowledge Base
As large language model (LLM) adoption grows, many organizations want to add their existing product brochures and white papers—often designed in InDesign—to a RAG (Retrieval-Augmented Generation) knowledge base.
Standard PDF extraction can lose the intended reading order of multi-column layouts or mix headers and footers into the main body text. Markdown extracted directly from IDML or INDD source files with SimplifyAI can often retain layout order and structural hierarchy more effectively than standard PDF extraction, making it better suited to LLM and vector database workflows.
If you need to process InDesign project files but do not have access to InDesign, try SimplifyAI’s document processing service.