The pdf compressor works like this: it reduces PDF size by re-encoding embedded images at chosen quality levels, keeping text vector-sharp. Everything happens on your device - the input never leaves your tab unless the tool clearly states it performs a server-side lookup.
How to use the PDF Compressor
Select or drop your file - it stays on your device.
Choose the operation's options (quality, range, position).
Run the process; large files show progress.
Download the result file.
Features
Files process locally - nothing is uploaded
Download the result with one click
Originals are never modified
Common mistakes to avoid
Renaming extensions instead of converting formats
Uploading confidential documents to unknown sites (never needed here)
Examples
Input
Result
8.4 MB scan
Typically 1-3 MB at "screen" quality, text unchanged
Best used for
Getting a reliable answer for pdf compressor without installing an app
One-off tasks done in under a minute from any device
Checking results before committing them to something important
Working on a phone where desktop software is unavailable
Privacy
Files never leave your device - PDF and archive processing runs entirely in this browser tab.
Frequently asked questions
Why does compression sometimes grow the file?
PDFs that are already image-optimized or mostly text have nothing to re-encode; the tool tells you when no gain is possible.
How does PDF compression shrink the file?
By re-encoding the embedded images at the quality level you choose - text and vector graphics stay sharp because they are not images at all.
Which quality level should I pick?
Medium (around 60-70%) suits screen reading; use high for print and low only for preview copies where artifacts on photos are acceptable.