The pages are never re-rendered, so the text stays text. What gets compressed is what is actually heavy inside the file: the images are re-encoded at a sensible resolution, the metadata no reader displays is dropped, and the invisible text layer a scan carries can go with it. Drop a file in and the page measures what it will actually do — in kilobytes, for your document — before you press anything. The download is never larger than the upload.
This runs in your browser. The file is not uploaded, there is no account to create, and nothing is added to the document you download.
Also searched for: reduce pdf size, shrink pdf, pdf compressor, optimise pdf. It is the same tool whichever way you found it.
No. The file is opened, changed and written by this browser tab — it is never sent to a server, so there is no queue to wait in and nothing to delete afterwards. Once the page has loaded you can turn the network off and the tool still works.
Because weight lives in images, and a PDF that is already only text has almost nothing to give up. Scans and photo-heavy documents lose the most. The line under the controls tells you the answer for your file before you start, and if nothing can be taken back you get your original untouched — the download is never larger than the upload.
Yes. Nothing is rasterised: the words, the fonts and the vector artwork are carried across untouched, so Ctrl-F and copy-paste keep working. Two things in Advanced options are exceptions worth knowing about — removing the embedded fonts keeps the text selectable but lets each reader substitute its own font, so the page looks different; and removing the hidden OCR layer under a scan means that scan stops being searchable. Both say so where you switch them on.
Metadata stripping and hidden-OCR removal are on by default because neither changes anything you can see. The rest are there for when the defaults have not got you far enough: cap how large images may be stored, drop colour from photographs, scale oversized pages down, or unembed the fonts — which is the biggest saving available on a text-heavy PDF and the only one that changes how the page looks.
There is no account, no daily cap and no watermark. The practical ceiling is your own device: everything happens in the tab, so a very large file is limited by memory rather than by a plan.