A scanned contract, a folder of receipts flattened into one file, a report with a dozen photos in it — and now Gmail or Outlook won't send it because it's over their attachment limit (usually around 20-25MB). You don't need Acrobat for this. A browser tool can shrink it in a few seconds.
Compress a PDF now →Most oversized PDFs aren't heavy because of text — text is tiny. They're heavy because of images: a scanner set to a high DPI, or photos pasted in at full resolution when the page is only going to be viewed at a fraction of that size. Compressing a PDF mostly means re-encoding those images at a size that still looks sharp on screen, without carrying pixels nobody will ever see.
The compressor runs in your browser tab. Drop the file in, pick a compression level, and it re-encodes the PDF locally — nothing is uploaded to a server in the process. When it's done you get the smaller file straight back, ready to attach.