What is PDF to PDF/A conversion, and who asks for it?
You upload a petition to a court e-filing site and it is rejected: document must be in PDF/A format. Or a university library wants your thesis as PDF/A. Or a tender portal lists it among the rules. Most people meet the term for the first time in an error message like that.
So, what is PDF to PDF/A? It is a clean-up of an ordinary PDF so that it meets an archive standard. The result is still a PDF. It opens in the same readers and looks the same on screen. What changes is inside: everything the file needs in order to be displayed is packed into it, and everything that could break or change with time is taken out.
This page is a PDF to PDF/A tool that does that clean-up for you. It is a PDF to PDF/A converter free of accounts, watermarks and daily limits, and it works in any browser on a phone or a computer.
PDF/A meaning in plain words
The A stands for archive. The PDF/A meaning is a promise: this file will look exactly the same in 30 or 50 years, on software that doesn't exist yet. A normal PDF may lean on fonts installed on your computer, colours tuned to one printer, or scripts that run when it opens. The PDF/A format bans all of that. It is an ISO standard, which is why courts, tax departments, land registries and national archives around the world insist on it.
PDF/A-1b, 2b or 3b: which version to choose
The PDF/A converter offers three levels. All three end in b, for basic, which guarantees that the file always looks the same. That is the level e-filing systems ask for.
- PDF/A-1b: the oldest and strictest. It does not allow transparency, so soft shadows or see-through logos may be flattened. Choose it when a portal says PDF/A-1 or when you want the widest acceptance.
- PDF/A-2b: our default and the recommended pick. It allows transparency and better image compression, so files are often smaller and graphics stay intact. Choose it when the rules only say PDF/A.
- PDF/A-3b: the same as 2b, but the standard allows other files to be attached inside the PDF. It is used mostly for electronic invoices.
Convert PDF to PDF/A format with embedded XML
E-invoice standards in Europe put a machine-readable XML file inside a PDF/A-3 document. We convert the PDF to PDF/A-3b, the version that permits this, but we do not create or attach the XML for you. If you need to convert a PDF to PDF/A format with embedded XML, your invoicing or accounting software has to produce that pair. For an ordinary archive copy with no attachment, 2b is the safer choice.
What changes when you convert PDF to PDF/A
When you convert a PDF to PDF/A online here, four things happen to the file.
- Fonts are embedded, so the text never falls back to a different typeface on another machine.
- Colours are converted to sRGB, a standard colour space every screen understands. Very bright print colours may shift slightly.
- JavaScript, encryption and other features the standard forbids are removed. In 1b, some transparency is flattened too.
- Archive metadata is written into the file, so checking software can recognise it as PDF/A.
Things to do before converting
PDF/A forbids encryption, so a password-protected file has to be opened first; if you know the password, unlock the PDF and then convert. Finish your edits too, since an archive copy is meant to be final. If a court wants searchable text and your document is a scan, run OCR on the PDF before this step. And if the portal has a size limit such as 5 MB, compress the PDF first, because compressing afterwards can undo the PDF/A changes.
We convert; we don't certify
The converter writes a file built to the PDF/A rules, and portals that check for the standard normally accept it. We do not issue a formal validation certificate, and no honest converter can promise that every damaged or unusual PDF will pass every checker. If a filing is critical, upload the result early, so there is time to fix the source document if the portal complains.
Digital signatures and form fields
Converting rewrites the file, so an existing digital signature will show as invalid afterwards, as it would after any change. Sign after converting, not before. Fillable form fields may also be fixed in place. Keep your original PDF in case you need to edit it again.
Size limits, scans and merging: getting the file right for the portal
Most portals check more than the PDF/A label. They also cap the file size, expect real text, and want one document rather than five. Handle those before you convert, in this order.
Convert PDF to PDF/A in 1 MB, or within 200 KB
Court and tender portals often say 1 MB, 2 MB or 5 MB per file; some government uploads say 200 KB. PDF/A can add a little weight, because fonts and a colour profile are embedded, so aim under the limit first. To convert a PDF to PDF/A in 1 MB, compress the original with the target size box set to 1000 KB, check the result, then convert it here.
For PDF to PDF/A within 200 KB the same order applies with 200 in the box; a scanned document that small will be black and white and a bit rough, but readable. Converting first and compressing second usually strips the PDF/A parts back out.
PDF to PDF with text: scanned files
A scan is a picture of a page. It can be converted to PDF/A, but there is no text inside it to search or select, and some registries reject that. To go from an image-only PDF to a PDF with text, run OCR first: the OCR tool keeps the scan as it is and adds an invisible text layer under it. Then convert the searchable file to PDF/A. Together, that is the version archives like best: the page looks like the paper, and the words can still be found with Ctrl+F in 20 years.
Append a PDF to another PDF before converting
If the petition, the annexures and the affidavit are separate files, join them first. Use merge PDF to append one PDF to another PDF in the order the rules ask for, put the pages straight with organize PDF if anything is out of place, and convert the single combined file to PDF/A. Converting five files and then merging them is not safe, because merging rewrites the document and the merged result may no longer pass the check.
How do I save a PDF as PDF/A without desktop software?
Paid desktop editors have a save as PDF/A option buried in their export menus, and some office suites can export a new document that way. That doesn't help when all you have is a finished PDF and a phone. If you wondered how to save a PDF as a PDF/A, or how to convert a PDF to a PDF file of the archive kind, the PDF to PDF/A converter online on this page is the short answer: select, choose a version, download.
People also search for a PDF to PDF/A converter free download. There is nothing to download or install here except your converted file, which suits office computers where you can't add software. How to go from PDF to PDF/A on Android or iPhone is the same as on Windows or Mac: open the site, pick the file from your storage, tap Convert to PDF/A.
Is there a PDF/A converter offline?
This page needs a connection, because the conversion runs on our server. A PDF A converter offline exists in two forms: the export dialog of a free office suite, which can save a document you are writing as PDF/A-1b, and the print or export menu of some desktop PDF editors. Both work only on a computer. For a finished PDF on a phone, or a file someone else made, the online route is the practical one.
How to open a PDF/A file afterwards
How do you open a PDF/A file in a PDF reader? Exactly like any other PDF. Any PDF reader app can read all PDF/A files, on a phone or a computer, because PDF/A is a subset of normal PDF rather than a new format. Some readers show a blue bar saying the file follows the PDF/A standard and opens read-only. That bar is a good sign, not an error.
Looking for a different PDF converter?
Searches for a PDF converter land here for all sorts of jobs, and PDF/A is only one of them. Are there any free PDF converters for the rest? Yes, each one is a sister tool on this site, and each is a PDF converter free to use with no sign-up. Visitors from Spain, Mexico or Brazil looking for a PDF a Word converter online gratis will find the same tools, at no cost, in English.
- A PDF converter to Word: PDF to Word gives you an editable DOCX. If you wondered which route is best, PDF to Word is the pick when you need to rewrite the text; PDF/A is for when the text must never change.
- Convert PDF to PDF to Word: no double step is needed. A PDF/A file is still a PDF, so you can send it straight to PDF to Word if you ever need to edit an archived copy.
- A PDF converter to Excel: PDF to Excel pulls tables from statements and invoices into a spreadsheet.
- A PDF converter to JPG: PDF to JPG saves every page as an image. A PDF/A file converts to JPG the same way as any other PDF.
- Convert a PDF or PDF/A to PPT: the PDF to PowerPoint tool places each page on its own slide, archive copy or not.
- A PDF merge tool: merge PDF files into one document before you convert it to PDF/A.
- Convert a PDF to PDF A4 size online: this converter keeps your page size as it is. There is no resize option yet.
- Convert a PDF to a PDF AI file: not supported. AI is a vector drawing format, and we don't produce it.
Privacy of your legal and official documents
Files that need PDF/A tend to be serious ones: affidavits, property papers, audit reports. The conversion runs on our server, so the file is uploaded, always over HTTPS. It is processed automatically, no person opens it, and it is deleted right after the result is delivered to you. We keep no copies and build no archive of our own.