PDF A4 Checker: Check PDF Size Online for Free
Check if your PDF is A4 size online. Upload your PDF to see its actual page dimensions, orientation, and whether each page matches the standard A4 format.
Drop your PDF here
or click below to choose a PDF file
How do I check if a PDF is A4?
Upload your PDF to this checker. It reads the actual page dimensions stored in the PDF and compares them with the standard A4 size.
Standard A4 is 210 × 297 mm, which is about 8.27 × 11.69 inches. A multi-page PDF can contain pages with different sizes, so checking each page can be useful.
What Is a PDF A4 Checker?
A PDF A4 Checker is a tool that checks the actual page dimensions of a PDF. It compares those dimensions with the standard A4 paper format.
A PDF can look like an A4 document when you open it on a computer, but its stored page dimensions may be different. This can cause problems when the file is printed, uploaded, or submitted to a service that requires A4 pages.
This tool checks the PDF page size instead of judging the size from how the document looks on your screen. For multi-page documents, it can also show the size of individual pages.
What Size Is an A4 PDF?
A4 is one of the most widely used paper sizes for documents. The standard A4 dimensions are:
| Measurement | A4 Size |
|---|---|
| Millimeters | 210 × 297 mm |
| Centimeters | 21 × 29.7 cm |
| Inches | 8.27 × 11.69 inches |
| PDF Points | Approximately 595 × 842 pt |
A4 Portrait
A4 portrait has a width of 210 mm and a height of 297 mm. This is the common vertical layout used for letters, reports and forms.
A4 Landscape
A4 landscape has a width of 297 mm and a height of 210 mm. The paper size is still A4, but the page is rotated into a horizontal layout.
How to Check if a PDF Is A4 Online
Upload your PDF
Drag your PDF into the upload area or click the Browse PDF button.
Check the file
Click the check button. The tool reads the page dimensions stored in the PDF.
Read the result
See how many pages are A4 and whether any pages have different dimensions.
What Our PDF A4 Checker Checks
The checker focuses on page size and related page information. It does not change your original PDF.
Page Dimensions
See the width and height of each PDF page.
Every Page
Multi-page PDFs can be checked page by page.
Orientation
See whether a page is portrait or landscape.
Mixed Page Sizes
Identify PDFs where some pages are A4 and others use a different page size.
PDF A4 Checker vs PDF Validator
A PDF A4 checker and a PDF validator are not the same type of tool.
An A4 checker focuses on the physical page dimensions stored in the PDF. A PDF validator can perform broader checks on the file structure, standards, or other technical requirements.
If you only need to know whether your document uses A4 pages, a page-size check is usually the relevant test. If you need to verify whether a PDF follows a particular technical standard, you need a validator designed for that standard.
Can You Check a PDF for Errors Online?
It depends on what you mean by an error. A PDF can have problems with its structure, fonts, images, metadata, security settings, or other technical features.
A PDF A4 checker is designed to check page dimensions. It should not be treated as a complete PDF repair or validation service.
If a PDF opens normally but has the wrong paper size, this tool can help identify the page-size problem. If the file does not open, is damaged, or fails a technical standard, a dedicated PDF validator or repair tool may be more appropriate.
How to Check PDF Version Online
PDF page size and PDF version are two different properties of a document.
The PDF version describes the specification level used by the file, while A4 describes the dimensions of its pages. A PDF can use A4 pages regardless of which supported PDF version was used to create the document.
If you need to check the PDF version, use a tool that reads the PDF version information directly. Do not assume the PDF version from its page size.
What Is a PDF/A Validator?
PDF/A is a family of PDF standards designed for long-term document preservation. It has requirements that go beyond page dimensions.
A PDF/A validator checks whether a document follows the requirements of a selected PDF/A standard. Depending on the standard, this can involve items such as fonts, metadata, color information, and other document features.
A PDF can therefore be A4 without being PDF/A compliant, and a PDF/A document can use different page sizes. These are separate properties.
A4 vs US Letter PDF Size
A4 and US Letter are two common document page sizes, but they are not identical.
| Paper Size | Millimeters | Inches |
|---|---|---|
| A4 | 210 × 297 mm | 8.27 × 11.69 in |
| US Letter | 215.9 × 279.4 mm | 8.5 × 11 in |
The difference can matter when a document is printed, submitted to an organization, or processed by a system that expects a specific paper size.
Why PDF Page Size Matters
Checking page size before you send or print a PDF can help avoid simple document problems.
Printing
A correct page size helps your document print in the format you expect.
Online Submission
Some submission systems or instructions may require documents in A4 format.
Business Documents
Reports, forms and office documents often use standard paper sizes.
Merged PDFs
Combining files from different sources can create a PDF containing mixed page sizes.
What If Only Some PDF Pages Are A4?
A PDF does not have to use one page size for every page. For example, a document could contain several A4 pages and one Letter page.
This can happen when pages are combined from different documents or created using different document settings.
If your file contains mixed sizes, the page-by-page results can show which pages match A4 and which pages need attention.
How to Fix a PDF That Is Not A4
If your PDF does not have the required A4 dimensions, the best fix depends on how the document was created.
- Open the original document in the application used to create it.
- Change the page or paper size to A4.
- Review the layout because changing page size can move text, images, tables, or margins.
- Export or save the document as a new PDF.
- Check the new PDF again to confirm that its pages have the required dimensions.
If you do not have the original document, a PDF page resizing tool may be useful. Always review the result after resizing because changing page dimensions can affect the document layout.
Can You Check if a PDF Was Edited Online?
A page-size checker cannot reliably prove whether a PDF was edited or who edited it.
A PDF may contain metadata or other information that provides clues about how it was created, but metadata alone should not be treated as proof of document history.
If document authenticity matters, a digital signature, trusted source copy, revision history, or comparison with the original document may provide stronger evidence.
What This PDF A4 Check Can Tell You
The result is based on the page dimensions stored in the PDF. This is useful when you need to confirm the actual page format rather than relying on how the PDF appears on your screen.
The checker does not decide whether a document is legally valid, authentic, approved by an organization, or compliant with every PDF standard.
For those requirements, always follow the instructions of the organization or service receiving your document.
PDF A4 Checker Frequently Asked Questions
Is A4 210 × 297 mm?
Yes. Standard A4 paper measures 210 × 297 mm. In inches, it is approximately 8.27 × 11.69 inches.
Can I check PDF A4 online for free?
Yes. Upload your PDF to the checker to compare its page dimensions with the standard A4 format.
Can a PDF contain different page sizes?
Yes. A multi-page PDF can contain different page dimensions and orientations. The individual page results can help identify those differences.
What is the difference between A4 and Letter?
A4 measures 210 × 297 mm, while US Letter measures 215.9 × 279.4 mm. They are different paper formats.
Can I check if a PDF was edited?
A page-size checker cannot reliably prove whether a PDF was edited. Document history may require metadata, digital signatures, an original file, or other evidence.
Can I check the PDF version with this tool?
This tool focuses on page dimensions and A4 size. PDF version is a separate property and should be checked with a tool designed for PDF version information.
Is PDF validation the same as checking A4 size?
No. A4 checking focuses on page dimensions. PDF validation can cover broader technical or standards-based requirements.
What is a PDF/A validator?
A PDF/A validator checks whether a PDF follows the requirements of a PDF/A archival standard. PDF/A compliance is separate from page size.
Can I check a PDF for errors online?
A PDF A4 checker can identify page-size differences, but it is not a complete PDF error or repair checker. Other types of PDF problems need different checks.
Does checking the PDF change my file?
No. The purpose of this tool is to inspect the PDF page information and report the result. It does not resize or edit the document.