Compress Image-Heavy PDFs
Make an image-heavy PDF easier to send by reducing embedded image resolution. Check small print, diagrams and page layout before relying on the result.
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How to compress Image-Heavy PDFs online
- Select a supported PDF file from your device and check its detected type and size.
- Review the output details and file limits. This tool uses fixed settings, so no settings dialog is needed.
- Choose Convert and wait for the result. A queued job is waiting for a processing slot; a processing job is being handled.
- Download the result and open it in the application where you will use it. Keep the original and remove the server copy when finished.
What you will download
One PDF with images downsampled to approximately 150 DPI. If that result is larger, a validated original copy is returned.
Available settings
This tool uses fixed output settings; there are no optional settings to change.
Understand your file formats
- PDF is a fixed-page document format for reading and sharing.
When this tool is useful
- Make an image-heavy PDF easier to send by reducing embedded image resolution. Check small print, diagrams and page layout before relying on the result.
Technical summary: Compress PDF
This operation writes PDF output with the page, pixel or text changes shown below.
| Format or operation | Format category | Compression behavior | Transparency support | Multi-page or animation behavior in ConverterZap | Typical best use |
|---|---|---|---|---|---|
| Fixed-page document | Container; text/vector and images may use different compression | Page graphics can include transparency; PDF image routes render/flatten pixels | Multi-page; merge/split/reorder/rotate preserve selected page order | Downsample PDF images: Images are reduced to approximately 150 DPI; a larger validated result falls back to the original. |
Explore the file formats
Need another direction or a different output? Use the format guides to see only the conversion routes that are currently published.
About your output
A PDF page can contain text, vector artwork, images, links and interactive objects. Downsamples images to approximately 150 DPI. Text and vector artwork may change; interactive elements are removed. If compression is larger, a validated copy of the original is returned.
Questions about Compress PDF
Why did my compressed PDF stay the same size?
Some PDFs are already compact or contain mostly text and vector artwork. If compression produces a larger result, the tool returns a validated copy of the original instead.
When can PDF compression leave the file unchanged?
A PDF that is already compact or mostly text/vector content may not shrink. If Ghostscript produces a larger validated result, the original copy is returned.
Which real-world check matters before I share this PDF file?
Open the downloaded result in the application that will receive it and check the behavior described in the limits: Downsamples images to approximately 150 DPI. Text and vector artwork may change; interactive elements are removed. If compression is larger, a validated copy of the original is returned.