My PDF is Too Large — How to Fix It

You've created or received a PDF and it's far larger than it should be. Maybe your email client won't send it, a web form won't accept it, or it just takes too long to download. Here's a systematic guide to diagnosing and fixing oversized PDFs.

First, understand why it's large

PDF size comes from a few main sources:

• Embedded images — especially uncompressed or high-resolution photos. This is the most common cause of large PDFs.
• Scanned pages — a scanned document is just images in a PDF wrapper. Each page can be 500 KB to several MB.
• Embedded fonts — PDFs often embed the full font file (200–500 KB each). Documents using many fonts accumulate this quickly.
• Revision history — PDFs edited repeatedly in Acrobat or Word can accumulate "update layers" that bloat the file.
• Metadata and hidden objects — thumbnails, XMP metadata, and redundant structure data.

Solution 1: Use a PDF compressor

The quickest fix is our Compress PDF tool. It strips metadata, removes redundant objects and re-encodes embedded images at lower resolution. For most documents, this produces a meaningfully smaller file with no visible quality change.

If you need to hit a specific size target — for example, an upload form that requires PDFs under 500 KB — try our size-targeted compressors: Compress to 500KB, Compress to 200KB or Compress to 100KB.

Solution 2: Reduce image resolution before creating the PDF

If you're creating a PDF from images, the resolution of those images directly determines the PDF size. For on-screen reading, 96 DPI is sufficient. For print, 150 DPI covers most needs. Most phone cameras produce images at 12 MP or more — that's far more resolution than any PDF viewer needs.

Resize your images before converting them to PDF. Our JPG to PDF converter handles this automatically.

Solution 3: Split the PDF

If you only need to share part of the document, split out the relevant pages rather than sending the whole thing. A 20-page report with a 2-page summary is much faster to share when extracted as a 2-page file.

Solution 4: Print to PDF

Opening the PDF and using File → Print → Save as PDF creates a fresh version processed through your operating system's PDF engine. This often strips revision history, flattens layers and removes metadata. It's free, built-in to every OS, and worth trying before reaching for dedicated tools.

When nothing works

Some PDFs are large because they simply contain a lot of content. A 100-page document with full-page high-resolution photographs will always be large. At some point, the choices are: reduce image quality more aggressively, split the document, or use a file transfer service (Dropbox, WeTransfer, Google Drive) instead of email.