What is PDF/A and why should I use it?

PDF/A is an ISO-standardized version of PDF designed for long-term digital archiving. It embeds all fonts, color profiles, and metadata so the document renders identically decades from now. Required by government agencies, courts, and institutions for regulatory compliance.

What is the difference between PDF/A-1, PDF/A-2, and PDF/A-3?

PDF/A-1 (based on PDF 1.4) is the most universally supported. PDF/A-2 (PDF 1.7) adds JPEG 2000 compression, transparency, and OpenType fonts. PDF/A-3 is identical to PDF/A-2 but also allows embedding any file type — useful for invoices with attached XML or spreadsheets.

What do the -a, -b, and -u suffixes mean in PDF/A?

The suffix defines the compliance level. Level b (basic) ensures visual reproducibility. Level u adds Unicode character mapping so text can be reliably searched and extracted. Level a (accessible) is the strictest — it requires tagged content, logical reading order, and full accessibility.

Which PDF/A conformance level should I choose?

For most use cases, PDF/A-2b is recommended — it balances broad compatibility with modern features like transparency and JPEG 2000. Use PDF/A-1b for maximum compatibility with older systems. Choose PDF/A-3b to embed file attachments. Choose -a variants when full accessibility is required.

Is it safe to convert my PDF to PDF/A online?

Completely. All conversion happens inside your browser — your files are never uploaded to any server. Everything runs locally on your device, so your documents stay 100% private.

Is there a file size or page limit for PDF to PDF/A conversion?

No. Everything runs in your browser with no server-side limits. Most devices handle PDFs up to 500 MB and hundreds of pages without issues.

Can I convert multiple PDFs to PDF/A at once?

Yes. Upload several PDFs and they all convert to individual PDF/A files, packaged into a single ZIP archive for easy download.

What does "Allow Downgrade" mean?

Some PDF elements — like non-embedded fonts or unsupported transparency — cannot be preserved at your chosen conformance level. Enabling Allow Downgrade lets the converter automatically fall back to a compatible lower level, ensuring conversion always succeeds.

Will my PDF/A look exactly like the original?

In most cases, yes. PDF/A requires removing elements not permitted in the standard — such as JavaScript, audio/video, and encryption. All visual content, text, images, and layout are fully preserved.

Does the PDF to PDF/A converter work on mobile?

Yes. Fully optimised for mobile with touch drag-and-drop and a responsive bottom sheet settings panel on all smartphones and tablets.

PDFto PDF/A

Convert PDF files to ISO-standardized PDF/A for long-term archiving. Free, instant, browser-based.

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PDF to PDF/A Converter Online Free — Archive-Ready Compliance | AziPDF

PDFto PDF/A

PDF to PDF/A Converter Online Free — Archive-Ready Compliance | AziPDF

PDFto PDF/A