PDF Image Resolution Changer - Change PDF DPI Online
Change the resolution (DPI) of images in a PDF. Choose from 72, 150, or 300 DPI. Free, private, runs entirely in your browser.
Click to select a PDF file, or drag and drop
Your file never leaves your browser150 DPI (Medium)
How to Change PDF Image Resolution
- Upload the PDF you want to re-render.
- Select a target DPI — 72 for screen, 150 for medium quality, or 300 for print.
- Click Change Resolution — every page is re-rendered at the new DPI and embedded into a fresh PDF. The download starts automatically and shows the before/after file size.
Example
A 5 MB PDF with 300 DPI images can be re-rendered at 72 DPI to produce a much smaller file suitable for email or web embedding. Conversely, a low-resolution document can be upscaled to 300 DPI for higher-quality printing, though upscaling won't add new detail.
Common Use Cases
- Reducing PDF file size by lowering image resolution for email or web use.
- Increasing DPI before printing to get sharper output on high-resolution printers.
- Standardizing all pages to the same resolution for consistent document handling.
FAQ
- Will increasing DPI add new detail? No — upscaling re-renders the page at a higher pixel density but cannot recover detail that wasn't in the original. It may reduce pixelation but won't sharpen blurry content.
- Does this preserve text quality? Text is re-rasterized as part of the page image, so it may appear slightly different. For text-only PDFs, consider tools that modify resolution without rasterizing.
- Is my file uploaded anywhere? No — everything happens in your browser.