Convert PDF to PDF/A on Mac
Make archival PDF/A files for courts, governments and long-term records.
PDF to PDF/A on a Mac
Screenshots from the app, using sample files.
How to use PDF to PDF/A
- 1
Install Ghostscript once
If it isn't installed yet, OneMacTools offers to install Ghostscript through Homebrew with one click.
- 2
Add the PDF
Drop one or more PDFs onto PDF to PDF/A.
- 3
Choose the standard
In the right-hand panel, pick PDF/A-2b unless the place you're sending it to asks for another level.
- 4
Convert
Click Convert. Ghostscript embeds the fonts and defines the colours the standard requires.
- 5
Check and send
The file, named “<name> PDF-A”, is saved in a dated folder in Downloads › OneMacTools.
What PDF to PDF/A does
PDF/A is the archival version of PDF that courts, tax offices and archives ask for: fonts embedded, colours defined and nothing that depends on the internet. OneMacTools converts to PDF/A-2b (or 1b or 3b) using the open-source Ghostscript engine, which it can install for you.
Uses Ghostscript, the free open-source PDF engine, which OneMacTools installs for you with one click through Homebrew.
Great for
- File documents with a court
- Submit records to a government portal
- Archive contracts for the long term
Options explained
- Standard
- PDF/A-2b (recommended), the default, is the most widely asked-for level. PDF/A-1b is the oldest and strictest, for systems that only accept it. PDF/A-3b also allows attached files, as some e-invoicing formats need.
Best practices
- Check what the court, office or archive asks for. If it just says PDF/A, PDF/A-2b is the usual choice.
- If a portal rejects the file, run it through a PDF/A validator, which tells you exactly what it objects to. OneMacTools can't promise every portal will accept the result.
- Colours are converted to RGB with an sRGB profile, so print-ready CMYK files may shift slightly.
- Remove any password first with Remove PDF Password; archival files can't be encrypted.
- Keep your original PDF too. PDF/A conversion can make some files noticeably larger because fonts are embedded.
Works with
- In
- PDF files, one or many at once.
- Out
- A PDF/A-2b, 1b or 3b copy of each PDF, named “<name> PDF-A”.
- Needs Ghostscript, the free open-source PDF engine (one-click install through Homebrew).
- Whether a particular court or portal accepts the file depends on its own checks.
Questions about PDF to PDF/A
How do I convert a PDF to PDF/A on a Mac?
Drop the PDF onto PDF to PDF/A, leave Standard on PDF/A-2b and click Convert. The archival copy is saved in Downloads › OneMacTools.
What is PDF/A?
An archival version of PDF designed to look the same in decades to come: fonts are embedded, colours are defined and nothing depends on outside resources.
Which PDF/A version should I choose?
PDF/A-2b unless you're told otherwise. Choose 1b only if a system insists on it, and 3b if you need to attach files, as some e-invoicing formats do.
What does the b in PDF/A-2b mean?
Basic conformance: the pages are guaranteed to look the same when reopened. It's the level most courts and archives ask for.
Will a court or government portal accept the file?
The file is made to the PDF/A standard, but every portal runs its own checks, so we can't promise acceptance. If it's rejected, a PDF/A validator will show why.
Why do I need Ghostscript?
Ghostscript is the free, open-source engine that does the conversion. OneMacTools installs it through Homebrew with one click and runs it on your Mac.
Does PDF to PDF/A upload my files?
No. PDF to PDF/A runs entirely on your Mac, so your files never leave it and it works offline.
Will PDF to PDF/A change my original files?
No. Results are saved as new files in a dated folder in Downloads › OneMacTools, and your originals are left exactly as they were unless you turn on an option that says otherwise.
What does PDF to PDF/A need?
macOS 26 or later and Ghostscript, the free open-source PDF engine, which OneMacTools can install for you through Homebrew with one click.
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