Compress PDF
Reduce file size while keeping the document exactly as it is. Nothing is sent anywhere.
Lossless. Streams are repacked and unused objects removed — nothing is resampled, so text stays sharp and images keep every pixel they arrived with.
Your file stays on your device
Compression happens inside your browser. The PDF you choose is never sent to a server, which is why this keeps working once the page has loaded, even offline.
Smaller, not worse
Most compressors get their headline percentage by resampling images and re-encoding them at lower quality. That is why a compressed PDF so often comes back visibly degraded — photographs gone muddy, a scan no longer legible when you zoom in.
This tool does none of that. Every page, every font and every image survives bit for bit. What shrinks is how the file is written, not what it contains, so the result is the same document at the same quality — just packed properly.
How to compress a PDF
- Drop your PDF into the box above, or click to choose it.
- Select Compress PDF.
- Check what was saved, then download the smaller file.
Where the savings come from
Four places, all of them lossless. Streams that were stored uncompressed are compressed. Objects nothing points at — a deleted page, a replaced font, whatever an editor left behind — are dropped. The dictionaries describing the document are packed into a single compressed block instead of sitting in the file as plain text. And the lookup table at the end becomes a compact binary stream rather than a padded list.
Frequently asked questions
How much smaller will my file get?
It depends entirely on how the file was made. Documents exported by word processors and scanners often carry a great deal of slack and shrink substantially. A PDF that has already been optimised may have nothing left to give, in which case the tool says so and hands the file back untouched rather than pretending.
Will the text still be selectable?
Yes. Nothing about the page content changes — text stays selectable and searchable, links keep working, and the page count is the same.
Can this make my file bigger?
No. If the rewritten document would be larger than what you started with, you get your original back unchanged. A tool called compress should never hand you something heavier.
Can I compress a password-protected PDF?
Yes. You will be asked for the password when the document is read. The compressed file is not password-protected.