PDF to PDF/A Converter — Free, Private, Browser-Based

Convert your PDF to the PDF/A archiving standard for long-term preservation. Choose conformance level (PDF/A-1b or PDF/A-2b) and quality settings. 100% in your browser — your files never leave your device.

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PDF/A is an ISO archiving standard (ISO 19005) for PDF documents used in long-term preservation. A PDF/A file embeds all fonts, colour profiles, and content required for reliable visual reproduction, while restricting features such as encryption and external references that could make the document unrenderable in the future. This converter produces PDF/A-1b (ISO 19005-1, based on PDF 1.4) and PDF/A-2b (ISO 19005-2, based on PDF 1.7) output free, with quality presets and per-page progress. All processing runs in your browser using WebAssembly — your document never leaves your device. SmallPDF and Sejda do not offer PDF/A conversion. iLovePDF and Adobe require paid plans.

What is the PDF/A Standard?

PDF/A is an international standard for the long-term archiving of electronic documents, defined by the International Organization for Standardization as ISO 19005. A PDF/A file is a self-contained document: all fonts, colour profiles, embedded images, and rendering metadata required to produce a visually accurate reproduction of the document are embedded within the file itself. External references, encryption, audio, video, and executable content are not permitted.

The purpose of PDF/A is to ensure that a document can be opened and displayed accurately years or decades after it was created, regardless of the software environment, operating system, or hardware available at that future time. This requirement underpins legal recordkeeping, government archiving, scientific data preservation, and regulated industry compliance.

PDF/A-1b vs PDF/A-2b

Standard	PDF/A-1b (ISO 19005-1)	PDF/A-2b (ISO 19005-2)
Based on PDF version	PDF 1.4	PDF 1.7
Published	2005	2011
Compatibility	Broadest — accepted by most government, court, and legacy systems	Modern systems; check submission requirements before using
Image compression	JPEG, LZW, CCITT Group 4	All of 1b, plus JPEG2000
Transparency	Not permitted	Permitted
Best for	Legal filings, government submissions, broad regulatory compliance	Documents using transparency; where file size efficiency matters

How it works

How to Convert PDF to PDF/A

Three steps. Both conformance levels (PDF/A-1b, PDF/A-2b). Quality preset before convert. Per-page progress through processing.

01
Step 1: Upload Your PDF
Drop your PDF onto the upload area or click to browse and select your file. The converter accepts standard PDF files. Your file is read directly by your browser using WebAssembly — it is not uploaded to a server at any point in the conversion.
02
Step 2: Choose Conformance Level and Quality Preset
Select the PDF/A conformance level — PDF/A-1b (ISO 19005-1, based on PDF 1.4) or PDF/A-2b (ISO 19005-2, based on PDF 1.7) — that matches your submission requirements. Then select a quality preset. Higher quality preserves more image detail and colour accuracy. Lower quality reduces output file size for efficient long-term storage while maintaining PDF/A compliance.
03
Step 3: Monitor Per-Page Progress and Download
Per-page progress is displayed as the converter processes each page to the chosen conformance level. When complete, download your PDF/A file. The output embeds all fonts and colour profiles, removes encryption and features not permitted by the standard, and is ready for submission to any system that accepts PDF/A.

What This PDF to PDF/A Converter Includes

Four features no other PDF/A converter offers: browser-based processing, no ads, quality presets, and per-page progress.

Files stay in browser

Processing runs in your browser using WebAssembly. Your PDF is never uploaded to a server. PDF24 processes PDF/A on their servers. If your document contains classified, legally privileged, or confidential content, browser-based conversion is the only option that avoids server exposure without deploying local enterprise software.

No ads or interruptions

No advertising banners or pop-ups. All five comparison tools show advertising or require subscription to remove it. The interface is clean and professional, appropriate for compliance workflows where advertising creates friction.

Quality presets

Choose output fidelity before converting. Higher quality preserves image detail and colour accuracy at the cost of larger file size. Lower quality reduces file size for storage-efficient archiving while maintaining PDF/A compliance. iLovePDF, PDF24, and Adobe do not offer quality presets — output quality is fixed.

Per-page progress

Real-time progress displays as each page is converted. Essential for large documents — legal bundles, medical records, and comprehensive compliance submissions can span hundreds of pages. iLovePDF, PDF24, and Adobe do not show per-page progress for PDF/A conversion.

PDF/A-1b (ISO 19005-1)

The most widely required PDF/A conformance level. Based on PDF 1.4. Accepted by government portals, court filing systems, healthcare record platforms, and the broadest range of document management systems. iLovePDF, PDF24, and Adobe also support PDF/A-1b.

PDF/A-2b (ISO 19005-2)

Based on PDF 1.7. Supports JPEG2000 compression, transparency, and layers. May produce smaller output files for documents using these features. Verify your submission system accepts PDF/A-2b before selecting this level for regulatory filings. iLovePDF, PDF24, and Adobe also support PDF/A-2b.

Free and unlimited

No daily conversion cap. iLovePDF requires a paid plan for PDF/A. Adobe requires a Pro subscription. PDF24 is free for PDF/A. SmallPDF and Sejda do not offer PDF/A conversion at all.

No account or watermark

No registration or login is needed. iLovePDF and Adobe require accounts for all conversions. PDF24 allows conversion without an account. No watermarks are added to the output PDF/A file at either conformance level.

Who Requires PDF/A Compliance

Government agencies and public sector. Government bodies in the US, UK, EU, and across major markets require PDF/A for official records, citizen-facing document submissions, Freedom of Information responses, and long-term archiving. The US National Archives and Records Administration (NARA), the UK National Archives, and EU institutional records systems all specify PDF/A for archival submissions. PDF/A-1b is the standard required for most government portals.
Legal firms and courts. Courts in multiple jurisdictions require PDF/A for electronically filed legal documents. Law firms converting contracts, case records, correspondence, and evidence for long-term storage use PDF/A to ensure documents remain accessible and visually accurate regardless of future software changes. PDF/A is part of e-filing requirements in federal and state court systems in the US and judicial systems in the EU and UK.
Healthcare and life sciences. Healthcare organisations convert patient records, clinical trial documentation, regulatory submissions to the FDA, EMA, and national health agencies, and research publications to PDF/A to ensure medical documents meet long-term retention requirements. HIPAA and other healthcare regulations require that records remain accessible and accurate for defined periods; PDF/A satisfies the archival document requirements of these frameworks.
Academic institutions and research. Universities converting theses, dissertations, research publications, and institutional records to PDF/A for submission to institutional repositories, national libraries, and open-access platforms use PDF/A-1b or PDF/A-2b depending on repository requirements. Many journal publishers and preprint servers also require PDF/A-compliant submissions.
Regulated financial and insurance sectors. Financial institutions, insurance companies, and investment firms subject to multi-year document retention requirements under frameworks such as MiFID II, Solvency II, and SEC Rule 17a-4 convert records, correspondence, and compliance documentation to PDF/A to meet audit-ready archival requirements. The combination of browser-based processing and PDF/A compliance makes this converter suitable for sensitive financial documents that cannot be uploaded to third-party services.

How we compare

Free, private PDF/A conversion

Most competitors don't offer PDF/A conversion, charge for it, or upload your files to their servers. This converter produces PDF/A-1b and PDF/A-2b free, in your browser, with quality presets and per-page progress that no competitor matches.

Feature	SmallPDF	iLovePDF	Sejda	PDF24	Adobe	Ours
PDF/A conversion	✗	✗ Paid	✗	✓	✗ Pro	✓
Free & unlimited	—	✗	—	✓	✗	✓
Files stay in browser	—	✗	—	✗	✗	✓
No ads or interruptions	✗	✗	✗	✗	✗	✓
No account needed	—	✗	—	✓	✗	✓
PDF/A-1b support	—	✓	—	✓	✓	✓
PDF/A-2b support	—	✓	—	✓	✓	✓
Quality presets	—	✗	—	✗	✗	✓
Per-page progress	—	✗	—	✗	✗	✓

Competitor information was accurate at time of publication and may have changed.

Frequently Asked Questions

What is PDF/A and why do I need to convert to it?

PDF/A is an ISO standard (ISO 19005) for archiving PDF documents in a format that ensures long-term preservation and reliable reproduction. It requires all content needed to render the document — fonts, colour profiles, and images — to be embedded within the file, while restricting features such as encryption and external references. Government agencies, courts, regulatory bodies, and healthcare organisations frequently require PDF/A for official submissions, legal filings, and records management. Converting to PDF/A ensures a document meets these archival requirements.

How do I convert a PDF to PDF/A for free?

Go to oneclickpdf.net/tools/pdf-a and drop your PDF onto the upload area or click to browse and select your file. Choose the conformance level — PDF/A-1b or PDF/A-2b — and select a quality preset. The conversion runs entirely in your browser and per-page progress is displayed during processing. Download the PDF/A file when complete. No account, signup, or payment is required. Your file is processed locally on your device and never transmitted to a server at any point.

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

PDF/A-1b is based on PDF version 1.4 and is the most widely required conformance level in regulatory, legal, and government contexts. It ensures basic visual reproduction of the document with all fonts and colour profiles embedded. PDF/A-2b is based on PDF version 1.7 and adds support for JPEG2000 compression, transparency, and layers, enabling potentially smaller files for documents using these features. Choose PDF/A-1b for the broadest compatibility. Choose PDF/A-2b when your document uses transparency or when smaller file size is a priority.

Will my PDF be uploaded to a server during PDF/A conversion?

No. The converter runs in your browser using WebAssembly. Your PDF is read from your device, processed locally, and never transmitted to a server. PDF24 processes files on their servers. iLovePDF requires payment for PDF/A and processes on their infrastructure. Adobe requires a Pro subscription and server-side processing. If your document contains classified, confidential, or legally privileged content, browser-based conversion is the only option that avoids server exposure without deploying local enterprise software.

What quality presets are available for PDF/A conversion?

The converter offers quality presets that balance output fidelity and file size. Higher quality settings preserve more image detail and colour accuracy in the PDF/A output at the cost of larger file size. Lower quality settings reduce file size for more efficient long-term storage while maintaining compliance with the PDF/A standard. iLovePDF, PDF24, and Adobe Acrobat do not offer quality presets for PDF/A conversion — the output quality is fixed. Quality presets are useful when converting documents with varied image content or storage constraints.

What does per-page progress mean during PDF/A conversion?

Per-page progress displays the conversion completion status as each page of your PDF is processed to PDF/A format. For multi-page documents, this provides real-time feedback on how the conversion is progressing and how many pages remain. iLovePDF, PDF24, and Adobe Acrobat do not display per-page conversion progress for PDF/A. This feature is particularly useful for large legal, compliance, or archive documents where conversion may take more than a few seconds to complete in the browser.

Will my document look different after converting to PDF/A?

PDF/A conversion preserves the visual appearance of your document. Text, images, and layout are maintained. The conversion embeds all fonts used and removes or adapts features not permitted in the PDF/A standard — such as encryption, external content references, and some annotation types. In most cases the converted document appears identical to the original. If the source PDF uses features incompatible with the chosen PDF/A conformance level, those elements are adapted to maintain the closest visual equivalent within the standard.

Does converting to PDF/A increase or decrease file size?

PDF/A conversion may increase or decrease file size depending on the source document. If the source uses fonts that are not embedded, embedding them for compliance increases file size. If the source contains image formats that are converted to PDF/A-permitted equivalents, size may change in either direction. PDF/A-2b can produce smaller files than PDF/A-1b for documents with JPEG2000 images or transparency. The quality preset you select also directly affects output file size, giving you control over the storage footprint.

Who needs to convert documents to PDF/A?

Government agencies and public sector bodies converting documents for official record-keeping and submission portals are the most common PDF/A users. Law firms and courts require PDF/A for legal filings, case records, and contract archives. Healthcare organisations maintain medical records and regulatory submissions in PDF/A. Academic institutions archive research publications and theses. Regulated financial institutions and insurance companies use PDF/A for compliance documentation. Any organisation subject to multi-year document retention requirements — including ISO standards, GDPR, and sector-specific regulations — benefits from PDF/A archiving.

Can I convert PDF to PDF/A on a phone or tablet?

Yes. The converter works in any modern mobile browser, including Safari on iPhone and iPad and Chrome on Android. Open the page in your mobile browser, tap the upload area to select your PDF, choose your conformance level and quality preset, and download the PDF/A file when conversion completes. The conversion runs in your browser without any app installation required. Per-page progress is displayed during conversion so you can monitor completion on mobile devices.

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