Image-heavy PDFs can balloon in file size when embedded images have higher resolution than needed for the intended use. PDFStream's image optimizer resamples embedded images to reduce file size without converting the document. The tool targets over-resolution images — a photo scanned at 600 DPI that will only ever be viewed on screen doesn't need to stay at 600 DPI. Reducing it to 150 DPI for screen or 300 DPI for print cuts file size dramatically with no visible difference at normal viewing distances. Use cases: optimizing a scanned archive for storage, reducing a photo-heavy catalog before emailing, compressing a presentation PDF for faster web loading, or preparing a large document for a platform with file size limits.

How-to

1
Upload file
Select the PDF.
2
Quality settings
Choose the image re-compression quality (Low, Medium, High).
3
Optimize & Download
Download the optimized PDF.

Frequently Asked Questions

How is this different from standard compression?▼

Unlike standard compression, this tool rasterizes each page into a JPEG image and rebuilds the PDF from those images — it doesn't re-encode individual embedded images in place.

Does text quality degrade?▼

Yes. Every page, including any text, is converted into a flattened image, so text is no longer selectable or searchable afterward. Avoid this tool for text-based documents — use Compress PDF instead.

Is the image optimization tool free?▼

Yes, it is completely free to use without registration or installation.

Are files stored on your server?▼

No. All processing occurs locally in your browser to ensure complete privacy.

Can I use it on mobile?▼

Yes, it works perfectly on all mobile and tablet browsers.

Is the output quality maintained?▼

Visually similar at normal zoom, but each page becomes a single image — text is no longer selectable or searchable, and fine detail may soften at higher compression levels. Best suited for scanned or image-heavy PDFs.

Is there a file size limit?▼

There are no limits as files are not uploaded to a server; processing is limited only by your device's memory.

How long does it take?▼

Most files are processed in just a few seconds.

Can I download the result multiple times?▼

Yes, you can download multiple times within your current session.

What if an error occurs?▼

If the file is damaged or encrypted, please try repairing it first and then try again.

Last Updated: August 6, 2026

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