Compress PDF
Compression is not one operation, so this does not pretend it is. A lossless rewrite keeps every bit of text, link and form field. Flattening pages to images shrinks a scan enormously and turns its text into pixels. Automatic runs what makes sense for your file and gives you the smallest result — or your original back, if nothing beat it.
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Runs a lossless rewrite, and additionally tries flattening the pages to images when the document looks like a scan. You get whichever result is smallest — and if neither beats your original, you get the original back untouched rather than a bigger file.
The file is read straight into the page. Nothing is uploaded, so there is no queue and no size cap beyond your device's memory.
It rewrites the file losslessly, and additionally tries flattening when the document looks like a scan. You can force either method instead if you know what your file is.
The result reports the size, the percentage saved, and exactly which method won — so you always know whether the text survived.
If nothing beat your original, that is what you get back, unchanged, with an explanation rather than a worse file.
Every candidate is measured against the file you supplied, and the original wins ties. This matters more than it sounds: naively re-encoding pages as images inflates an ordinary text document by roughly 150 times per page, which is how a lot of “compressors” quietly hand back something worse.
Text is cheap — a page of it costs about a kilobyte. Almost all of a large PDF is embedded images: phone photos at full sensor resolution, or scans at 600 DPI. That is why a scanned invoice bundle compresses by 80% while a text report compresses by nothing at all.
Lossless means object streams are rebuilt and page content copied verbatim. Flattening means each page became a JPEG, so text is no longer selectable and form fields and links are gone. Both are legitimate results; not saying which one you received is not.
Rendering and re-encoding both happen in the browser. Your document is not uploaded, queued, or held on a server for a couple of hours — there is no server in the path at all.
A calm, fast PDF workspace. Free to use, private by default.
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