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Optimize Images

Downscale and optimize images inside PDF

How it works:

  1. 1Upload a PDF file
  2. 2Select quality/resolution
  3. 3Click "Optimize Images" to apply

About this tool

Shrink a PDF that is too heavy to send by downscaling and compressing the images packed inside it, all while keeping the document looking crisp and professional. The tool intelligently reduces oversized images and applies efficient compression to each one, striking a balance between a much smaller file and strong visual quality on every page. That makes it a natural choice for squeezing image-heavy reports under email limits, clearing the upload caps on web portals, or speeding up how quickly bulky presentations and catalogs share and store. Your privacy is built in by design, since the compression runs entirely on your own device inside the browser and nothing is ever sent to a server, so confidential files stay confidential. The optimized PDF comes out sharp and is available to download as soon as the work completes. Think distributing large documents, archiving efficiently, or prepping PDFs for fast online delivery, and it serves professionals emailing big reports, businesses tuning documents for the web, and anyone who needs a smaller, faster file.

You might also need

Compress PDF

Reduce file size while maintaining quality

Remove Images

Strip all images from PDF, keep text only

Extract Images

Pull out all embedded images from a PDF

Frequently Asked Questions

It locates the embedded images inside your PDF, downscales ones that are larger than needed, and recompresses them with efficient settings. Because images are usually the bulkiest part of a document, this typically produces a much smaller file while keeping pages looking sharp.
Yes. You can set a JPEG compression quality level and a maximum resolution for the longest side of each image. Lower settings shrink the file more aggressively, while higher settings preserve more detail, letting you balance size against visual sharpness.
No. The tool detects images with transparency and re-encodes them as PNG to preserve the alpha channel, while opaque photos are compressed as JPEG for maximum savings. Transparent logos and overlays keep their see-through areas intact rather than gaining a solid background.
Some specialized formats, such as certain CMYK, JBIG2, or JPEG2000 streams, can't be re-encoded in the browser. The tool simply skips those images and continues optimizing the rest, so the job completes successfully instead of failing on an unsupported picture.
Yes. All downscaling and compression runs locally on your device, and nothing is uploaded to a server. Your PDF stays private, which is ideal for shrinking confidential reports or presentations before emailing them, all completely free of charge.

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Guides and explainers related to this tool