Compress PDF Images Only
Compress only the embedded images in your PDF - text, fonts, and vector graphics stay completely untouched. Use the JPEG quality slider to control how aggressively images are compressed, then download the result instantly. Text remains sharp, selectable, and searchable. All processing happens locally in your browser with zero server uploads and no signup required.
Balanced - good quality with significant size reduction.
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Why Use Our Compress PDF Images Only Tool?
Text Stays Sharp - Images Get Smaller
Unlike full PDF re-rendering tools, our compress PDF images only tool targets exclusively the embedded image XObjects in your PDF. Text, fonts, vector graphics, and annotations are completely untouched - text remains crisp, selectable, and searchable after compression.
Secure Compress PDF Images Online
Your PDF never leaves your device when you compress PDF images online. 100% client-side processing in your browser ensures complete privacy for confidential reports, contracts, and documents containing sensitive embedded images.
Adjustable JPEG Quality Slider
Choose exactly how aggressively to compress embedded images with the JPEG quality slider (20%-95%). High quality (80%+) produces minimal visible difference. Balanced (60-75%) gives significant size reduction. Aggressive (below 60%) maximises compression for large image-heavy PDFs.
Compress PDF Images - No Installation
Compress PDF images directly in your browser without installing Acrobat, Ghostscript, or any other software. Works on desktop and mobile - free forever with no file size limits and no watermarks on the output PDF.
Common Use Cases for Compress PDF Images Only
Annual Reports and Whitepapers
Corporate annual reports and whitepapers contain high-resolution charts, photos, and infographics that inflate file size. Compress PDF images only to reduce the download size while keeping all text, tables, and vector diagrams perfectly sharp.
Contracts with Embedded Signatures
Legal contracts often contain scanned signature images or embedded photos. Compress PDF images only to reduce file size for email delivery while preserving the text content, formatting, and searchability that legal documents require.
Product Catalogues and Brochures
Marketing PDFs with product photography can reach tens of megabytes. Compress PDF images only to reduce catalogue file sizes for web download and email distribution while keeping product descriptions and pricing text perfectly readable.
Web-Optimised PDF Downloads
PDFs published on websites need to load quickly without sacrificing text quality. Compress PDF images only to reduce the download size for web visitors while ensuring the document remains fully text-searchable for SEO and accessibility.
Scanned Document Archives
Scanned documents saved as PDF often contain large TIFF or PNG image streams. Compress PDF images only to convert these to JPEG at a controlled quality level, dramatically reducing archive storage costs without affecting the readable content.
Email Attachment Optimisation
PDFs with embedded photos frequently exceed email attachment limits. Compress PDF images only to reduce the file size below email thresholds while preserving the text content that recipients need to read, copy, and search.
Understanding Compress PDF Images Only
What is Compress PDF Images Only?
Compress PDF images onlyis a targeted compression technique that reduces the file size of embedded image XObjects in a PDF without modifying any other content. A PDF file is a structured container that holds multiple types of objects: text streams, font data, vector path instructions, and image XObjects. Standard PDF compression tools re-render entire pages as rasterized images, which destroys text sharpness and removes text selectability. Our compress PDF images only tool instead locates each image XObject in the PDF's resource dictionary, re-encodes it as JPEG at your chosen quality level, and replaces it in-place - leaving all text, fonts, and vector content completely untouched.
How Our Compress PDF Images Only Tool Works
- Upload Your PDF: Drop any PDF file into the upload zone. The compress PDF images only tool shows a page preview and accepts standard PDF files of any size. Encrypted PDFs are loaded with encryption ignored for processing.
- Instant Browser-Based Processing:Click "Compress PDF Images" and the tool iterates through every page's XObject resource dictionary, identifies image XObjects by their Subtype entry, decodes each image via an HTML5 canvas, re-encodes it as JPEG at your chosen quality, and replaces the stream bytes in-place. All processing happens locally in your browser - your PDF never leaves your device.
- Download Your Compressed PDF: The tool shows the original size, compressed size, number of images found, and number of images successfully compressed. The compressed PDF downloads automatically with text, fonts, and vector graphics completely preserved.
What Gets Compressed vs. What Stays Untouched
- Compressed - Image XObjects: Embedded raster images (JPEG, PNG, TIFF, BMP) stored as XObject streams in the PDF resource dictionary are re-encoded as JPEG at the selected quality level.
- Untouched - Text Streams: All text content, including font encoding, character spacing, and text positioning, is completely preserved. Text remains selectable, copyable, and searchable after compression.
- Untouched - Font Data: Embedded font subsets and font metrics are not modified. Text renders at the same quality as the original PDF on all devices and operating systems.
- Untouched - Vector Graphics: Path instructions, bezier curves, fill colors, and stroke data for vector illustrations, charts, and diagrams are completely preserved at their original resolution-independent quality.
Important Limitations
The compress PDF images only tool works best on PDFs that contain standard embedded image XObjects. Some PDFs use inline images (embedded directly in the content stream rather than as XObjects) which cannot be individually targeted by this approach. PDFs created by scanning software may store pages as a single full-page image XObject - in this case, the tool will compress that image but the result is equivalent to a full-page compression. For PDFs where text searchability is not required, the Compress PDF to 200KB or Compress PDF tools may achieve greater overall size reduction.
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Frequently Asked Questions About Compress PDF Images Only
Compressing PDF images only means reducing the file size of embedded raster images in a PDF without modifying any other content - text, fonts, vector graphics, and annotations remain completely untouched. This is different from standard PDF compression tools that re-render entire pages as images, which destroys text sharpness and removes text selectability.
Yes, completely. The compress PDF images only tool targets exclusively the image XObjects in the PDF resource dictionary. Text streams, font data, and vector path instructions are not modified in any way. Text remains fully selectable, copyable, and searchable in the output PDF.
Yes, completely. The compress PDF images only tool runs entirely client-side in your browser. Your PDF files are never uploaded to any server, never stored, and never transmitted over the network. This makes it safe for compressing confidential reports, contracts, and documents containing sensitive images.
Yes. The compress PDF images only tool is 100% free with no signup, no premium tier, no file size limits, and no watermarks on the output PDF. You can compress as many PDF files as your browser memory allows without any restrictions.
For most documents, 70-80% quality provides an excellent balance of file size reduction and visual quality - the difference from the original is virtually invisible to the human eye. For maximum compression (large image-heavy PDFs), use 40-60%. For archival quality where visual fidelity is critical, use 85-95%.
If the PDF contains no image XObjects, the tool reports "No embedded images found" and re-saves the PDF with structure optimization only (useObjectStreams compression). The output will be slightly smaller than the original due to object stream compression, but no image compression is applied.
The tool only replaces an image if the re-encoded JPEG is actually smaller than the original. If an image is already stored as a highly compressed JPEG at a quality level close to your chosen setting, the re-encoded version may not be smaller and the original is kept. This prevents the tool from accidentally making the PDF larger.
Yes. Scanned PDFs typically store each page as a single full-page image XObject. The compress PDF images only tool will compress these page images at your chosen quality level. Note that for scanned PDFs, the text is already part of the image (not selectable), so the result is similar to a full-page compression.
The standard Compress PDF tool re-renders entire pages as JPEG images to achieve maximum size reduction - this makes text non-selectable. The compress PDF images only tool targets only the embedded image XObjects, leaving text and vector content completely intact. Use this tool when you need to preserve text quality and searchability.