1. How does PDF compression work?
We extract every page as an image, then re‑encode them at a lower quality or resolution. The new PDF is built from these compressed images – all inside your browser.
2. Can I set a specific target file size like 20 KB?
Absolutely. Enter your target (e.g., 20) in the KB field, and the compressor will iterate image quality and resolution until the final PDF size lands within ±1 KB of your target.
3. Is my PDF uploaded to any server?
No. All processing happens locally using JavaScript. Your file never leaves your device, guaranteeing complete privacy.
4. What types of PDFs compress best?
Scanned documents and image‑heavy PDFs compress most dramatically. Text‑only PDFs may not shrink as much because they are already very efficient.
5. Will the text still be readable after compression?
Yes, we prioritize readability. Even at extreme compression, the text remains sharp enough for submission and printing. For exact size requests, some resolution trade‑off may occur, but we always keep it legible.
6. Can I rename the output file before downloading?
Yes, after compression you’ll see a file name box where you can type any name you like before hitting download.
7. Does it work on mobile phones?
Fully responsive. You can compress PDFs directly from your Android or iPhone browser. Just select the file from your device storage.
8. Is there a file size limit?
While there is no hard limit, very large PDFs (>50 MB) might slow down processing. For best results, keep files under 50 MB.
9. What is the difference between "Recommended" and "Extreme" presets?
These are quick options for when you don't need an exact size. "Recommended" keeps high quality, while "Extreme" gives the smallest possible file. If you enter a target KB, these presets are ignored.
10. Does compression add any watermark or logo?
Never. The output PDF is completely clean and identical to the original apart from file size.