How to Downsample Images Online
Step-by-step instructions to reduce image dpi in a pdf to shrink file size with ZiaSign.
Why this workflow matters
ZiaSign's image downsampler reduces the resolution (DPI) of images inside your PDF to decrease file size while maintaining readable quality. Choose 72 DPI for screen, 150 for print, or set custom DPI.
Step by step
Downsample Images is one of the fastest ways to reduce image dpi in a pdf to shrink file size. Pro access gives you the full workflow.
- 1
Upload your PDF
- 2
Set target DPI
- 3
Click 'Downsample'
- 4
Download the smaller PDF
Frequently asked questions
What DPI should I use?
72 DPI for screen viewing, 150 DPI for standard print, 300 DPI for high-quality print.
Will downsampling make images blurry?
At 150+ DPI, most images remain sharp for print. At 72 DPI, images look great on screen but may appear soft when printed at large sizes.
Does it affect vector graphics?
No. Only raster images (JPEG, PNG) are downsampled. Vector elements like text and shapes remain at full resolution.
How much file size reduction can I expect?
Reducing from 300 DPI to 150 DPI typically cuts image data by 75%. Actual savings depend on the number and size of images.
More specific workflows for this tool
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Read guideReady to run the actual workflow?
You have the steps. Open the tool, process the file, and then move into the next recommendation if the document still needs cleanup, protection, or conversion.