OmniDocFree Online PDF/A Converters: Convert PDF to PDF/A
Learn how to convert PDF to PDF/A online, what to check in a converter and its output, and how OmniDoc can prepare scanned PDFs first.
If you need to convert PDF to PDF/A for free, you are usually preparing a file for long-term storage, a court or government submission, or an archive that requires a standard format. A PDF/A file is a PDF built to stay readable and reproducible over many years, with fonts embedded and no features that depend on outside software. Many people find that a free online converter handles the job, but the results vary more than the sign-up page suggests.
The problems usually come from the source file. A scanned PDF has no text to archive, a file with missing fonts can fail validation, and an encrypted or damaged file may not convert at all. Knowing what to check before you upload saves you from a rejected archive copy.
This guide explains how to pick a free online route, what to check in the converter and in the output, and how to prepare the file. You will also see where OmniDoc fits. OmniDoc does not export PDF/A itself, but its PDF editor can run OCR on scans and let you edit text, so the file you send to a converter is cleaner.
How do you convert a PDF to PDF/A for free? The short answer
Use a free online converter for a simple digital PDF, but first run OCR and fix obvious problems if the file is scanned or damaged. Then validate the output against the PDF/A level your recipient requires.
| Your situation | What to do | Why |
|---|---|---|
| Digital PDF with selectable text | Convert with a free online converter that names the PDF/A level it produces | The text layer already exists, so the job is mostly a format change |
| Scanned PDF with no selectable text | Run OCR first, review the text, then convert | Some PDF/A levels expect searchable text, and OCR adds it |
| File with encryption, password protection or damaged pages | Remove the restriction you are allowed to remove, repair pages, then convert | Converters often reject locked or broken files |
| Confidential or sensitive document | Check the service's upload and retention terms, or use a desktop tool | Free online services handle your file on their servers |
| Submission to an office with a set PDF/A level | Confirm the required level, convert to it, then validate the result | Requirements differ between archives and agencies |
How each approach works
Free online converters
You upload a PDF to a website, choose an output option, and download the converted file. Some services list the PDF/A level they produce, while others only say "archive format." Free tiers often limit file size, page count or the number of conversions, and some add a watermark or ask for an account.
These converters suit short, digital, unencrypted PDFs where you need a quick format change. They fall short when the file is scanned, when the output level is unclear, or when the document is sensitive. Check the service's privacy terms before uploading anything confidential.
Desktop PDF tools with PDF/A export
Some desktop PDF applications can export PDF/A directly and let you pick a conformance level. This route gives you more control over fonts, color profiles and the output level, and the file stays on your computer during processing. The downside is that these tools often cost money or require installation, and their menus vary.
Desktop tools suit regular archiving work, large files, or confidential material. They take more time to learn than a browser upload.
Preparing the file in OmniDoc first
OmniDoc does not export PDF/A. Its PDF editor can OCR scanned PDFs, edit paragraph text in place, insert, delete, rotate or reorder pages, and redact sensitive content. You can use these operations to clean up the source file, then pass the result to a PDF/A converter.
This route works well when the problem is the source file rather than the conversion itself. OCR output can contain recognition errors, so review the text before you archive it.
📊 At a glance
| Approach | Handles scanned pages | Privacy of uploaded file | Review effort after conversion | Good for |
|---|---|---|---|---|
| Free online converter | Only if the service runs OCR | Depends on the service's terms | Check level and fonts | Quick conversion of simple digital files |
| Desktop PDF tool with PDF/A export | Depends on the tool's OCR feature | File stays on your computer | Check level and fonts | Regular archiving and sensitive files |
| OmniDoc prep, then a converter | Yes, through OCR in the PDF editor | Depends on the converter you choose | Review OCR text and validate output | Scans and messy PDFs |
🎯 Which approach fits you?
If you have a simple digital PDF with selectable text
A free online converter is usually enough. Confirm that the output names a PDF/A level and open the result to check that text, images and page order look right.
If you have a scanned contract, letter or form
Run OCR on the scans first, using the PDF editor in OmniDoc, so the text becomes searchable. Read through the recognized text and correct errors before you convert, since the archived copy will keep whatever is in the text layer.
If the file is confidential
Avoid uploading it to a service whose terms you have not read. Use a desktop tool that processes the file locally, or ask your records office which tool they accept.
If an office requires a specific PDF/A level
Get the exact level from the requirement, such as the conformance version written in the instructions. Pick a converter that states the level it produces, then validate the output yourself with a PDF/A validator.
If the file will not convert
Check for password protection, damaged pages and unembedded fonts. Fix what you are allowed to fix, such as removing a permission restriction on your own file, then retry the conversion.
Preparing a scanned PDF in OmniDoc
- Open the PDF on omnidoc.top, or open it in the desktop client from download.omnidoc.top.
- Use the PDF editor's OCR feature on the scanned pages so the text becomes searchable.
- Read through the recognized text and correct any errors, especially in names, numbers and dates.
- Edit any paragraph text that needs fixing, and remove or reorder pages you do not want to archive.
- Save the edited file, then upload it to a PDF/A converter.
- Open the converted file and validate it against the PDF/A level your recipient requires.
❓ FAQ
1. How do I check whether a PDF is already PDF/A?
Open the file's document properties in your PDF reader and look for a PDF/A identification entry. The label alone is not proof, so run the file through a PDF/A validator if the result matters.
2. Does converting to PDF/A change how my document looks?
It can. Converters may replace missing fonts, flatten transparency or adjust color, so compare the output against the original, page by page, before you archive it.
3. Why does my converted file fail validation?
A common causes are fonts that are not embedded, encrypted content, transparency effects or a mismatch between the converter's level and the required level. Fix the source file and convert again.
4. Can OmniDoc export a PDF as PDF/A?
No. OmniDoc does not export PDF/A. You can use its PDF editor to run OCR and edit the file, then convert it with a PDF/A converter of your choice.
📝 Summary
To convert PDF to PDF/A for free, a free online converter works for simple digital files, while scanned or damaged PDFs need preparation first. Check the PDF/A level, review the text after OCR, and validate the result against what the recipient requires.
