Compress PDF
Free·No signup·Files never leave your device
How to compress a PDF in 3 steps
Shrink oversized PDFs below email and upload limits without installing anything.
Upload the PDF
Drop your document in the box above — it opens locally, instantly.
Pick a quality level
Choose High quality for printing, Recommended for everyday sharing, or Extreme for the smallest possible file.
Download the smaller PDF
Click Compress PDF and see the size comparison, then download in one click.
Why compress PDFs with AmiPDF
Real size savings with honest quality trade-offs — decided by you, not a black box.
Private by design
Processing happens entirely inside your browser. Nothing is uploaded, stored, or shared — ever.
No signup, no watermark
No account, no email, no limits. Your output comes out exactly as your files went in.
See the savings up front
The result card shows the original and compressed sizes side by side, plus the exact percentage saved.
Works on any device
The same fast experience on Windows, Mac, Linux, Android, and iOS — no installation.
When to compress PDF files
Email attachments over the size cap, upload forms that reject large files, scans that ballooned to hundreds of megabytes — compression brings them back down. Think of it as a PDF compressor that runs on your own machine: no queue, no upload, no size reported to anyone. Image-heavy and scanned PDFs shrink the most, often by half or more.
Compression runs entirely on your device, so contracts and private documents never leave your browser.
Compress PDFs on any platform
AmiPDF runs in your browser — nothing to install, nothing to configure, nothing to update.
Windows
Chrome, Edge, Firefox
macOS
Safari, Chrome
Linux
Any modern browser
iOS
Safari on iPhone, iPad
Android
Chrome, Samsung Internet
Frequently asked questions
Will my PDF be uploaded to a server?
No. All compression runs entirely in your browser. Your PDF is never uploaded, and memory is cleared when you close the page.
Why didn't my PDF shrink much?
PDFs that are mostly text and vector graphics are already small, so there is little room to compress — try the Extreme level to reduce further. Large, image-heavy or scanned PDFs compress best, often 50% or more.
Can I still select, copy, and search the text after compression?
No. This tool re-renders and re-encodes each page to shrink the file, so every page becomes an image and text is no longer selectable or searchable.
What is the difference between the three quality levels?
High quality: almost no quality loss, smaller reduction — best for printing or archiving. Recommended: the best trade-off for everyday sharing. Extreme: the smallest size with noticeable quality loss, for preview-only files.
Are encrypted PDFs supported?
Not yet. Remove the password first with our Unlock PDF tool, then compress the unlocked copy.
How many pages can I compress?
Up to 100 pages and 50 MB per file. For longer documents, split them first with our Split PDF tool, then compress the parts.
Can I compress a PDF to a specific size, like 100KB or 1MB?
There is no exact-size dial — instead, pick a level, compress, and read the before-and-after size report shown before download. Still over your cap? Step down one level and run it again; each pass is fast. Very tight caps under 200KB are realistic only for a few light pages, so split large documents first.
Related PDF tools
Keep going — more free PDF tools for whatever comes next.