How to Compress PDF Files
Email reject your attachment because it's too big? Website upload failing? Andromeda PDF's resizing tool drastically reduces file size by converting each page into an optimized image — like a high-quality scan.
Choose Your File
Upload the document you need to shrink. There is no size limit since we don't upload your file to any server.
Select Compression Level
Low: Best quality, largest file (light compression).
Medium: Balanced quality and size, best for sharing.
High: Smallest file, lowest quality (pages are downscaled).
Process Locally
Click "Compress PDF". Each page is re-rendered as an optimized image right on your device — like a high-quality scan — and rebuilt into a smaller PDF.
Expert Guide: Understanding Compression
PDF files are often bloated because they contain high-resolution images meant for professional printing (300+ DPI). For viewing on a screen, you rarely need more than 72-150 DPI.
What we keep:
- The visual appearance of every page
- Original page dimensions
- Page order and count
What you give up:
- Selectable and searchable text
- Links, form fields, and interactivity (flattened)
- Bookmarks and document structure
Technical Insight: Full-Page Rasterization
Our compression isn't just a "zip" file operation. We render each page and re-encode it as an optimized JPEG image at its original dimensions — like a high-quality scan of your document.
This means text will no longer be selectable or searchable, and links and form fields are flattened into the image. It's ideal for scanned documents and image-heavy files, but less suited to text documents you still need to search or copy from.
Why Resize Client-Side?
Save Your Data Plan
Imagine you have a 200MB file to compress. On other sites, you have to upload 200MB (slow!) and then download the result. With Andromeda PDF, 200MB of data never leaves your computer. We process it locally, saving you massive amounts of bandwidth and time.