A large PDF is a problem in almost every context. It is too big to attach to an email, too slow to upload to a portal, and too heavy to store efficiently on a shared drive. Reducing a PDF's file size is one of the most common document tasks, and there are several effective ways to do it.
What makes a PDF large?
- High-resolution embedded images (the most common cause)
- Many pages with complex graphics
- Embedded fonts and multiple font subsets
- Revision history and hidden metadata from editing software
- Attached files or multimedia content
Method 1: Use an online PDF compressor
The simplest way to reduce PDF file size is to use a dedicated compression tool. These tools analyse the internal structure of the PDF and apply multiple optimisations at once, including reducing image DPI, re-encoding images at a lower quality, removing hidden metadata, and cleaning up unused objects.
- Open pdfanything.com/compress
- Upload your PDF
- Choose Medium compression for a good balance of size and quality
- Click Compress PDF and download the result
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Free PDF Compressor — free, no sign-up required
Method 2: Remove unnecessary pages
If only part of the PDF needs to be shared, extracting specific pages can reduce the file size dramatically. Use the Split PDF tool to extract only the pages you need. A 100-page report with 20 relevant pages will be far smaller once the unneeded pages are removed.
Method 3: Convert to images first
For PDFs that are primarily scanned images, converting each page to a compressed JPG and then reassembling them as a PDF can produce a smaller file. Use Convert PDF to JPG to export the pages, then Convert Images to PDF to rebuild the document at lower resolution.
How small can a PDF get?
Results depend on content type. A 10 MB PDF consisting of scanned photographs can often be reduced to 2 to 3 MB with medium compression. A 10 MB PDF made up of text and simple vector graphics may only compress to 7 or 8 MB because there is little image data to optimise. The more image content a PDF contains, the more it can be compressed.
When compression is not the answer
If the PDF is large because it has many pages, compression alone may not make it small enough for email. In that case, consider splitting the document into sections and sending them separately, or uploading it to cloud storage and sharing a link.