Replace Image
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What is Replace Image?
Replace Image swaps a specific image in a PDF with a new one you provide. The tool iterates through every page, identifies the image at the specified index, and replaces its data while preserving the original position, dimensions, and page layout. The new image can be PNG or JPEG format.
The implementation uses pdf.js to scan the document for image objects, then pdf-lib to embed the replacement image and update the page's XObject references. Pages without images are passed through unchanged.
How to Use Replace Image
- Upload the PDF containing the image you want to replace.
- Provide the replacement image (PNG or JPEG) using the New Image option.
- Set the image index (default: 1) to specify which image to replace. Index 1 replaces the first image found in the document.
- Click Replace Image. The tool swaps the target image across all pages.
- Download the result as
replaced.pdf.
Why Use Replace Image?
Updating a logo, product photo, or embedded screenshot in a PDF without recreating the entire document saves significant time. Instead of exporting from the original design tool, making the change, and re-exporting, you can swap the image directly. This is particularly useful for contracts with embedded diagrams, presentations with outdated screenshots, or brand assets that need refresh across multiple documents.
Privacy & Security
Your files never leave your browser. Every step — scanning for images, embedding the replacement, and writing the output — happens on your own device using pdf-lib and pdf.js compiled to WebAssembly. Nothing is uploaded to Racira's servers, no copies are stored in the cloud, and no file data is transmitted at any point.
Frequently Asked Questions
How do I know the image index?
The image index counts images in document order (first page, top-to-bottom, left-to-right). Start with index 1 and increment if you need a later image. The tool replaces the same index on every page — if your PDF has different images per page, process each page separately after splitting.
What image formats are supported?
PNG and JPEG are supported. The tool first attempts to embed as PNG; if that fails, it tries JPEG. For best results, match the format of the original image — use PNG for graphics with transparency and JPEG for photographs.