PDF File Size Calculator Online
Estimate and inspect PDF file size online. See KB, MB, bytes, page count when available, and compression planning notes in your browser.
Check PDF size
About this PDF file size calculator
This PDF file size calculator checks a selected PDF and reports bytes, KB, MB, last modified time, and a quick upload-readiness note. It is useful before sending email attachments, submitting forms, uploading documents to portals, or deciding whether a PDF needs compression.
The file is inspected locally in your browser for size information. The page does not need to upload the PDF to calculate MB or KB, which makes it faster for quick checks and safer for private drafts.
Use the result to compare against common upload limits such as 5 MB, 10 MB, 20 MB, or 25 MB. If a PDF is too large, try compressing images, removing unused pages, exporting with lower image quality, or splitting the document.
How to reduce PDF size
Large scanned PDFs are usually caused by high-resolution images. Compress images, convert scans to grayscale when color is not needed, remove duplicate pages, and avoid embedding unnecessary fonts. For official forms, keep a readable backup before reducing quality.
If an upload portal rejects your file, compare the exact MB result with the portal limit and leave a small margin because some systems calculate megabytes differently. Recheck the final PDF after compression.
FAQ
Is this tool free?
Yes. It is free to use on FreeToolsSpace and does not require sign-up.
Does the tool upload my files or text?
The core action runs with JavaScript in your browser. Avoid pasting information you should not process in any web page.
Can I use it on mobile?
Yes. The layout is responsive and works in modern mobile browsers.