A PDF that is too big to email is usually too big because of the pictures inside it. This page reduces the file size by re-encoding those images, and leaves the text alone. Your file never leaves this page. Everything happens in your browser, and there is no upload endpoint to send it to — that is checked by a build gate that fails if any network code reaches a tool’s bundle.
How to do it
- Add the PDF that is too large.
- Press Compress and let it finish. There is one setting and the tool applies it for you.
- Download the result and check the new size before you send it.
Questions
What size do I need for an email attachment?
Most mail providers cap a message at around 25 MB, and some corporate systems are stricter — 10 MB is a safer target. The tool shows the finished size, so you can see whether the result clears the limit before you send it.
Why did my PDF barely get smaller?
Because there was little to remove. If the document is mostly text, the images that compression works on are not there, and the file is already close to as small as that content can be. That is a real answer, not a failure — and it is better than a tool quietly damaging the pages to hit a number.
Will the pages look worse?
Rarely, on a screen. The tool works at a balanced setting picked to save real space without visible damage, and on most documents nobody notices the difference. Photographs and fine detail in scans are where re-encoding shows first, and print quality suffers before screen quality does — so look at the result before sending a document to a printer.
Can I compress a scanned document?
Yes, and scans are where this works best — a scan is a stack of photographs, which is exactly what re-encoding helps with.