See Exactly What Makes Your PDF Large
Break a PDF's size down by images, fonts, pages and structure, list the largest items and suggest how to cut it.
Free, with no sign-up and no watermark. The file is processed in your browser and never uploaded.
See where the bytes in a PDF actually go. The analyzer breaks the file down into images, fonts, page content, graphics, metadata, attachments, annotations and structure, shows the weight of each page, lists the ten largest images with previews, dimensions and encoding, and lists embedded fonts — flagging ones that aren't subset. Plain-language suggestions link to the tool that will help.
Step by step
- Upload the PDF: Drop it onto Upload a PDF to analyse.
- Analyse: Click Analyse File Size.
- Read the breakdown: Check Where the bytes go and Weight per page.
- Act on suggestions: Follow the links, for example to Compress PDF or Page Remover.
Handy for
Upload limits
Understand why a file is over a portal's limit.
Design exports
Spot huge images or fully embedded fonts from design apps.
Hidden extras
Find attachments or bulky metadata you didn't know were there.
Choosing a fix
Decide between compressing, deleting pages or splitting.
Good to know
If images dominate, compression usually helps a lot. If fonts or text dominate, it won't — split the file instead with Split to Size Limit.
Shares are approximate when the file stores objects in compressed object streams.
Questions
Are my files uploaded anywhere?
No. The file is read and processed by JavaScript running in your browser tab. Nothing is sent to a server, and the result is created on your device.
Does it change my file?
No. It only reads the file.
What is a subset font?
A font that contains only the characters the document uses. A fully embedded font can add hundreds of kilobytes.
Further reading
- How to Compress a PDF to 200 KB, 100 KB or 1 MB — Set a target size in Compress PDF to hit portal limits like 200 KB or 1 MB, see what makes a PDF big, and split the file when it still will not fit.
More Organise PDF tools
- Every Page as Its Own PDF (ZIP) — Save every page of a PDF as its own single-page PDF, numbered in order and packed into one ZIP.
- Merge PDF — Join two or more PDFs into one file in the order you set, copying every page without re-encoding it.
- Split PDF — Break a PDF into several files by your own ranges, every N pages, or one page each, delivered as a ZIP.
- Split PDF at a Keyword — Start a new file at every page that contains a word or phrase you enter, using the PDF's text layer.
- Split PDF by Chapter Bookmarks — Cut a PDF into one file per top-level bookmark, each named after its chapter and zipped in reading order.
- Cut PDF Pages in Two — Cut every page into left and right or top and bottom halves, so scanned book spreads become single pages.