Skip to main content

PDF CONVERTER

PDF to PDF/A

Convert PDF files to PDF/A archival standards with conformance validation

Max upload 100MB · Automatic cleanup after 60 minutes

Drag & drop your PDF file here

or click to browse files

Supports PDF files up to 100 MB

PDF/A Options

PDF/A Standard

Choose the PDF/A standard for your needs.

Compatibility

Optimise for maximum compatibility.

Include Metadata

Preserve document metadata (title, author, etc.).

File Optimization

Optimize file size while maintaining quality.

  • 100% Secure

    Your files are automatically deleted after processing

  • Standards Compliant

    Generate PDF/A-1b, PDF/A-2b or PDF/A-3b

  • Preserve Content

    Maintains text, images, fonts and original layout

  • Long-Term Access

    Ideal for archiving and legal documents

How to Convert

  1. 1

    Upload PDF File

    Choose or drag & drop your PDF file.

  2. 2

    Select PDF/A Options

    Choose the PDF/A standard and settings.

  3. 3

    Convert

    Our tool converts your PDF to PDF/A in seconds.

  4. 4

    Download

    Get your PDF/A file and start using it.

Why Convert to PDF/A?

  • Long-Term Preservation

    Keep documents accessible for decades.

  • Open Standard

    ISO compliant and platform independent.

  • Reliable Access

    Consistent appearance across different systems.

  • No Dependencies

    Embedded fonts and resources for future access.

Supported PDF/A Standards

PDF/A-1b

ISO 19005-1

Widely supported archival baseline

PDF/A-2b

ISO 19005-2

Recommended for most documents

PDF/A-3b

ISO 19005-3

Supports embedded file attachments when safe

Convert PDF to PDF/A for long-term archiving

PDF/A is an ISO archival format designed for long-term preservation. OneFileKit converts your PDF to PDF/A-1b, PDF/A-2b, or PDF/A-3b, then validates the result before marking the job complete.

Conversion success depends on fonts, color spaces, transparency, encryption, and other features in the source file. We never claim a file is PDF/A solely because a converter produced an output — validation must pass.

Frequently asked questions

What is PDF/A?

PDF/A is an ISO standard for archiving electronic documents. It restricts features that make long-term rendering unreliable and requires embedded fonts and self-contained resources.

Which PDF/A standard should I choose?

PDF/A-2b is recommended for most documents. PDF/A-1b is widely supported for older workflows. PDF/A-3b allows embedded file attachments when safely supported.

Can every PDF be converted to PDF/A?

No. Encrypted PDFs, missing fonts, unsupported color features, or other constraints can prevent conformance. When conversion or validation fails, we show a clear message instead of claiming success.

Do you validate PDF/A conformance?

Yes. Jobs complete only after the output exists and passes validation (veraPDF when installed, otherwise strict structural PDF/A checks).

What is the maximum file size?

By default, PDF to PDF/A accepts uploads up to 100MB (configurable by administrators).

Security & privacy

  • Files are validated by extension, declared type and PDF signature before processing.
  • Uploads and outputs live in private storage — never under public/static web paths.
  • Download links require a secret token bound to your job.
  • Temporary files are deleted automatically after a configurable retention period.

Related PDF Tools