How to Compress a PDF Without Uploading It
Picture a 31 MB scanned lease that has to reach a letting agent. Gmail turns it into a Drive link, the agent's portal wants a file under 10 MB, and the scanner software that made it is long gone. That situation is the reason Compress PDF exists: you pick the file, pick how aggressive to be, and get a smaller copy back in the same tab.
Three modes, three different trade-offs
Most compressors hide what they do. This one makes you choose, and the choice matters.
Keep text and links is the gentle option. It repacks the PDF's internals and throws away objects nothing refers to any more. Your text stays selectable, links still click, bookmarks and form fields survive, and the pages look identical. The catch: it doesn't touch the images already inside the file. A Word export full of text may drop a lot; a scan, which is basically a stack of photos, often barely moves.
Smaller file and Clearer pages take the opposite approach. Every page is rendered as a picture, saved as a JPEG, and placed on a fresh page with the original dimensions. Smaller uses harsher JPEG settings; Clearer keeps more detail. Both mean the result is image-only, so you lose text selection, search, links and fillable fields. There's also a Grey pages checkbox that removes colour for an even lighter file. These two modes handle up to 300 pages per run.
A quick routine that works
- Open the tool and choose your PDF.
- If the file came out of Word, Google Docs or a website, start with Keep text and links.
- Press Compress PDF and read the note under the button, which shows the size before and after.
- Not small enough? Run it again on the original with Smaller file. Tick Grey pages if nobody needs the colour.
- Open the download and zoom in on the smallest print before you send it.
For a scanned lease like that, the gentle mode would save very little because the file is all images. Smaller file with grey pages is the mode most likely to get it under the portal limit; check that the signature is still legible before sending.
Pitfalls worth knowing
- Sometimes there's no download. If the new file wouldn't be smaller, the tool keeps your original and tells you why instead of handing you a bigger file. That usually means the PDF was already efficient.
- Don't picture-compress forms you still need to fill. Once a page becomes a JPEG, the fields are just pixels. Fill and flatten first, compress last.
- Huge pages come out a little soft. Browsers cap how large a drawing canvas can get, so oversized pages (architectural drawings, posters) are scaled down to fit before being saved. For those, the gentle mode is safer.
- Searchable PDFs stop being searchable in the picture modes. If you ran OCR to make a scan searchable, compressing it with Smaller file throws that work away.
- Your original file is never modified. The result is a separate download, so experimenting costs nothing.
Where the file goes
The PDF is processed inside the browser tab and isn't uploaded, according to the tool page. That makes it a reasonable choice for leases, payslips and ID scans you'd rather not hand to a random upload site. The page itself carries Google ads, as the rest of the site does.
FAQ
Which mode should I try first for an email attachment? Keep text and links for anything born digital. Jump to Smaller file (plus Grey pages) for scans and phone photos of documents.
Why did the file get only slightly smaller? Probably because most of its weight is in images that the gentle mode leaves alone. The picture modes are the ones that recompress those.
Will people still be able to copy text out of it? Only if you used Keep text and links. The other two modes turn the words into part of an image.
Does it work on a phone? It runs in the browser, so yes, though very long documents depend on how much memory the phone gives the tab.
Next time an upload form rejects your file, open Compress PDF and try the gentle mode first.
— Alok Kumar Singh