PDF Page Aspect Ratio Checker - Check PDF Page Ratios
Check the aspect ratio of every page in a PDF and match each to a standard size (A4, Letter, Legal, A3, A5). Free, private, runs entirely in your browser.
Click to select a PDF file, or drag and drop
Your file never leaves your browserHow to Check PDF Page Aspect Ratios
- Upload the PDF you want to inspect.
- Click Check Aspect Ratios to see the width-to-height ratio for every page.
- Pages are also matched to standard sizes (A4, Letter, etc.) and labelled as portrait or landscape.
Example
A standard A4 page has an aspect ratio of 1:1.414 (portrait), while US Letter is 1:1.294. A widescreen presentation PDF might show 16:9 — helpful to know before printing or importing into design software.
Common Use Cases
- Confirming whether a PDF uses A4 or Letter before printing in a different region.
- Detecting mixed page sizes in a batch-scanned document.
- Verifying aspect ratios before importing into presentation or layout software.
FAQ
- Why does a page show as "Custom"? If the dimensions don't match any built-in standard (A4, A3, A5, Letter, Legal, Tabloid, etc.) within a few points, the page is labelled "Custom".
- What is the gcd-based ratio? The tool simplifies the width-to-height relationship to the smallest whole-number ratio (e.g. 1:1.414 becomes 1:1.414 as a decimal, or simplified to 707:1000).
- Is my file uploaded anywhere? No — all analysis happens entirely in your browser.