What is /Alt and why does it matter?

The Alt entry on a PDF image is what a screen reader announces when a blind user reaches the image. Without it, the reader says nothing or a generic "image" — useless for the user.

Will I see images embedded as page content (not XObjects)?

Many PDFs put images on page content streams instead of as named XObjects; those are harder to detect. This audit catches the common case (images placed via XObject reference, which is by far the most common).

Are the files uploaded?

No — pdf-lib reads the structure in your browser.

Image Alt-Text Audit

Walk a PDF's image XObjects and report which images have alt-text (/Alt) and which do not — the no-1 accessibility miss in most PDFs.

Your files never leave your browser. All processing happens on your device — nothing is uploaded.

1. Upload your file

How does the Image Alt-Text Audit work?

Audit every image inside a PDF for the presence of alt-text (the /Alt entry on the image XObject). Missing alt-text is the most common accessibility gap in PDFs and the one that bothers screen-reader users most. The tool walks each page's resource dictionary, finds every image XObject, and reports whether each has alt-text set and what the alt-text says. It does not modify the PDF — fixing /Alt requires the source authoring tool (Word, LibreOffice, InDesign) at this version.

🔒 Security & Privacy

All processing happens on your device. Your files never leave your browser, never touch our servers, and are not stored anywhere. Close the tab and the file is gone.

📱 Use it on any device

Works in any modern browser — Mac, Windows, Linux, iPhone, Android, and tablets. No installation, no app to download. Just open the page and start.

⚡ Quick & easy

Drag, drop, click. Most files process in seconds, not minutes. No watermarks added to your output, no per-day limits, and the tool always shows the result before asking you to download.

🎁 Always free, no signup

Free to use, every time. No account creation, no email required, no “trial” that converts to a paid plan. We make money from ads so you don’t have to pay.

Frequently asked

No — it audits only. pdf-lib does not expose a clean API for setting /Alt on image XObjects after the fact. Fix at source-document time and re-export the PDF.