Private PDF tool
How to Check a PDF for Accessibility
WCAG Check handles a focused document job inside the browser. This guide explains when to use it, how to prepare the source, which choices matter, and how to review the exported copy before sending it to someone else.
Use automated findings as a starting point, then review headings, reading order, alt text, tables, forms, contrast, and keyboard use.
When WCAG Check is useful
An accessibility check can identify missing metadata, untagged content, and other problems that may affect people using screen readers, keyboards, zoom, or high contrast settings. No automated score can decide whether every part of a document makes sense.
Use WCAG Check when the task matches that purpose and the source file is in your control. A focused tool is usually easier to understand than a long workflow with steps the document does not need. Write down the expected result before opening the file, including the page count, filename, size limit, and any instructions from the recipient.
Prepare the source before making changes
Use the source document when it is available because headings, lists, tables, and alt text are easier to correct there. Set the document title and language, then save a working PDF. Know the audience and any standard the publisher must follow.
Keep the original in a separate folder and work on a copy. Open the source in a normal PDF reader, move through the full document, and note anything unusual such as scans, forms, comments, signatures, mixed page sizes, or uncommon fonts. This first check gives you something reliable to compare with the output.
Load the working copy into WCAG Check only after the source check. Browser processing means the supported document operation happens on your device. The file does not need to be sent to a PDFOmni processing server, although normal website resources, analytics, ads, and optional online features can still use internet requests.
Make the important choices before export
Review the tag structure and reading order, especially on pages with columns or sidebars. Check meaningful images, table headers, form labels, link text, contrast, and keyboard order. Test important public documents with assistive technology and real users when possible.
Use settings that match the final destination rather than choosing the strongest or fastest option automatically. A school portal, office archive, printed packet, and phone-readable copy can have different needs. The correct result is the one that remains clear and meets the instructions, not the one with the most dramatic setting.
Complete the change in WCAG Check and export a new file. Give it a name that explains its status, such as review or submitted, instead of final2. Do not delete the source or overwrite the only copy. If the result is wrong, return to the clean source rather than repeatedly processing an already changed output.
Mistakes that are easy to miss
Treating a passing automated result as a compliance certificate skips manual problems. Slow down around this point and compare the result with the source instead of assuming a completed progress bar means the document is ready.
Adding OCR to a scan creates text but does not create headings or a logical reading order. Slow down around this point and compare the result with the source instead of assuming a completed progress bar means the document is ready.
Fixing only visual appearance can leave the tag structure confusing for a screen reader. Slow down around this point and compare the result with the source instead of assuming a completed progress bar means the document is ready.
Use related tools only when the document needs them
After using WCAG Check, Edit PDF can handle the next part of the workflow when that change is actually required. Open the downloaded copy, check it first, and then use it as the input. This keeps each step understandable and makes it easier to find where a problem began.
PDF to Text is another useful option when the document needs a different kind of preparation. Keep a clear filename between steps and avoid stacking changes just because the buttons are available. Every extra export creates another version that must be reviewed.
Use PDF to Image when its purpose matches the final delivery. These tools are linked directly because they often belong near this task, but they are not mandatory. A short workflow with one correct action is better than a long workflow that changes parts of the PDF for no reason.
Privacy and device limits
The core WCAG Check operation runs locally in the browser. That can be useful for private school records, applications, invoices, contracts, and personal documents because an unnecessary server copy is removed from the workflow. Local processing does not protect a file from an unsafe computer, an untrusted browser extension, or a recipient who should not have received it.
Large and complicated PDFs use the memory and processor of the device in front of you. A short digital report may finish quickly, while a high-resolution scan with hundreds of pages can take longer or exceed the practical limits of an older phone. Close other demanding tabs, keep a backup, and use approved offline software when school or workplace policy requires it.
Review the exact downloaded file
Close the working preview and reopen the downloaded PDF. Confirm the filename, page count, order, orientation, smallest text, images, forms, links, and any area changed by the tool. Check at normal zoom and high zoom. Open the file in a second reader when it is going to an official portal or another important destination.
Compare the export with the source and the written goal from the beginning. A successful download only proves that a file was created. It does not prove that a signature is on the right page, a redaction removed its text, a table stayed readable, or a page range contains every required sheet. The final review is part of the task, not an optional extra.
Keep the source and reviewed output until the recipient accepts the document. If another change is needed, choose the relevant linked tool and start from the best available version. The purpose of WCAG Check is to make one PDF job simpler while leaving you in control of the document and its versions.
Related PDFOmni pages
Use these pages when you are ready to apply the ideas from the guide to a document.