Extract Files from elibrary.icao.int

ICAO eLibrary Reader → PDF: When, Why, and How to Use This Repository

In the world of identity documents, travel document standards, and machine-readable zones, access to official source material matters. A lot. For engineers, researchers, compliance teams, and developers working with MRZ parsing, border control systems, or document verification, the standards behind passports, visas, and ID documents are not optional reading—they are the foundation of the work. That is exactly where this repository comes in.

The project, ICAO_extractor, is a browser-based userscript designed to extract documents from the ICAO eLibrary reader and turn them into clean, usable files. Instead of being stuck with a partially accessible or protected viewer, users can convert the document into a clean PDF or a page-by-page PNG set.

This is more than a convenience. It is a practical tool for anyone who needs official ICAO documents in a form they can store, cite, inspect, or process downstream.

What this repo is

The repo is a JavaScript userscript that runs in the browser with Tampermonkey. It interacts with the ICAO eLibrary reader and the PDFTron viewer embedded inside it. The script reaches into the live browser session, extracts the already-loaded document, removes the security layer, renders each page, and rebuilds a downloadable file.

In other words, the script solves a very specific but very important problem:

The ICAO eLibrary allows access to official standards, but the reader experience is not designed for easy offline extraction. Many of the documents are displayed in a protected viewer, and the visible content is not always available in a normal PDF file that can be downloaded directly or copied cleanly. This project fixes that.

Why this project exists

A lot of official standards are publicly available, but that does not mean they are easy to use. The README for this project highlights several common issues with the ICAO eLibrary reader:

• Saved PDFs may request a password
• The page content may be blank when viewed in a normal PDF viewer
• The viewer hides content behind optional content groups (OCGs)
• Print-to-PDF is blocked
• Text is rendered in canvas or a protected viewer rather than in the DOM

These are not small inconveniences. If you are trying to reference a standard, archive a document, or build a compliance pipeline around it, these issues can make the material effectively unusable.

This repository solves those challenges by giving users a practical way to generate a clean, readable file from the viewer’s actual rendered output.

The project was built around a clear purpose: to make ICAO Doc 9303, especially the parts related to machine-readable travel documents, more accessible and more usable in the real world.

Who should use it

This tool is valuable for several audiences:

• Identity document engineers
• Border security and immigration technology teams
• OCR and MRZ developers
• Standards compliance professionals
• Researchers studying ICAO travel document rules
• Anyone who needs an archival copy of an official ICAO document

If your work depends on understanding passport layouts, visa codes, TD1/TD2/TD3 formats, or MRZ structure, this repository is directly relevant.

It is especially helpful for professionals who need to:

• cite exact standards in code comments or technical docs
• archive official ICAO documents in a clean format
• share source material with collaborators
• validate machine-readable document parsers against the official specification
• convert standards into image-based OCR or AI processing pipelines

What the tool can extract

The README makes it clear that the repository is not a random PDF scraper. It is targeted at ICAO standards documents, especially those related to machine-readable travel documents.

The project is useful for documents on:

• TD1, TD2, and TD3 formats
• MRV-A and MRV-B visa formats
• passport type codes such as PP, PD, PO, PE, PR, PT, PS, PL, and PM
• ICAO Doc 9303 parts

In practical terms, this means users can obtain the exact standards needed for developing MRZ validators, OCR pipelines, document inspection workflows, or identity document tooling.

Nice features included

The README lists an impressive set of features for a userscript:

• preset modes for reading, archival, print, and AI/OCR
• adjustable DPI settings
• page-range selection
• PDF or PNG output
• live progress monitoring
• download summary cards
• cancellation support
• keyboard shortcuts
• persistent settings
• responsive UI

These are not just extras. They matter.

For example, a person working with AI or OCR may prefer PNG export, while a compliance researcher may want a clean PDF. Another user may only need a small range of pages instead of the whole document. The script is designed to support real-world use patterns rather than forcing a single output mode.

When to use this repo

This repo is ideal when the following conditions are true:

• you are working with an ICAO eLibrary document
• you need a clean, viewable file outside the reader
• you need the document for legal compliance, documentation, or offline use
• you want to archive a standard without losing context
• you need to extract a page range or whole document from a protected viewer
• you want a robust, browser-side workflow instead of relying on external systems

It is less useful if you are not dealing with ICAO reader pages or if you need to work with unrelated PDFs in a generic context.

The project is best seen as a specialized browser utility for a very specific domain: ICAO standards extraction.

How it works

The README includes a diagram and explanation of the architecture, which is one of the most interesting parts of the project.

At a high level, the flow looks like this:

1. The script loads on the ICAO eLibrary page.
2. It locates the embedded PDFTron viewer used by the site.
3. It reaches into the viewer’s document object.
4. It accesses the decrypted PDF or document state already loaded in the browser.
5. It strips the security wrapper.
6. It rasterizes each page at the selected DPI.
7. It reconstructs a clean PDF or PNG output.
8. It triggers a browser download.

This is a clever design because the browser already has the document available in memory. The script does not need to fetch anything from an external service or bypass a backend. Instead, it leverages the viewer that is already handling the document.

That is also why it is so effective. The actual content is already rendered in the reader environment; the script simply converts that rendered state into an exportable file.

Why rasterization is used

One of the most important technical decisions described in the README is the use of rasterization instead of trying to copy the vector PDF directly.

The issue is that the original content may be hidden in Optional Content Groups (OCGs), which are layer-based structures used by some PDF viewers. The visible material may not be preserved in a usable way when exported in a standard way. A normal PDF viewer could hide the real content or show incomplete pages.

Rasterization solves that by rendering the viewer’s actual visual state into images. The script captures what the user sees, then rebuilds the content as a clean PDF or set of PNGs.

This makes the workflow more reliable even if the underlying document structure is complex or the viewer is intentionally restrictive.

Installation and setup

The project is intentionally simple to install, but it requires the right environment.

Requirements:

• a Chromium- or Firefox-based browser
• Tampermonkey extension
• access to an ICAO eLibrary document page

Installing it:

1. Install Tampermonkey in your browser
2. Open the Tampermonkey dashboard
3. Add the userscript manually or install it from a raw URL
4. Reload the ICAO page
5. Look for the floating extract button

The README suggests a button appears in the bottom-right corner of the page. Once installed, the script becomes active on supported ICAO pages.

How to use it

Once installed, the workflow is straightforward.

1. Open an ICAO eLibrary page
2. Wait for the page to load
3. Click the floating “Extract” button
4. Choose your preset or custom settings
5. Select pages and output format
6. Start extraction
7. Download the final file

The settings panel lets you choose:

• reading, archival, print, or OCR preset
• output file type, PDF or PNG
• resolution or DPI
• page ranges or single-page mode

The presets are especially useful:

• Reading: best for general screen use
• Archival: better for long-term storage
• Print: designed for high-quality print output
• AI/OCR: optimized for image-based machine processing

Each preset balances image quality and file size differently, which shows the project has been designed with real-world use cases in mind.

Atypical but practical use example

Imagine you are developing a passport or visa MRZ parser and need to validate it against the actual ICAO standards. You can open the relevant standard in the ICAO eLibrary, run the extract script, and save a clean PDF or PNG copy. Then you can:

• annotate the document
• search the pages
• compare your algorithm against the official layout
• share it with colleagues
• keep a traceable archive for audits and compliance work

This makes the script especially useful when a team is creating or verifying document-reading software against official references rather than unofficial summaries.

Troubleshooting and reliability

The README also includes helpful troubleshooting guidance. It explains what to do if:

• the button never appears
• the reader is not detected
• extraction fails with zero rendered pages
• too few bytes are generated
• downloads are blocked
• the floating button is misplaced

This is a sign of a mature project. The script is designed to be used in a real browser environment where page timing, memory, and viewer state can vary. The maintainer has already anticipated the main failure modes and documented them.

Limitations and responsibilities

The project is honest about what it is and is not. It does not claim to bypass authentication or circumvent access restrictions. It works with publicly accessible documents and does not create an unauthorized bypass system.

It also includes a legal notice telling users to respect the terms of the source website and not redistribute copyrighted material improperly. That is important in a tool that handles official documents and can generate downloadable copies.

The project is useful, but it should be used responsibly and in compliance with the policies of the source platform and applicable law.

Conclusion

The ICAO_extractor repository is a specialized and highly practical browser utility for anyone who needs access to ICAO standards documents in a clean, usable format. It exists because the official ICAO eLibrary reader is not friendly to extraction, archiving, or downstream processing. This userscript solves that problem by working inside the browser and converting the live rendered document into a proper PDF or PNG export.

The design is thoughtful and practical:

• targeted at a real need
• built around the viewer that already contains the document
• optimized for reliability
• simple to install and use
• useful for standards work, compliance, OCR, and engineering tasks

https://elibrary.icao.int/home