Adding a logo or image to an existing PDF is a common need — branding a template, adding a company logo to a document you received, inserting a signature image, or placing a stamp on a page. The approach depends on whether you need the image on one specific page, every page, or as part of a recurring header or footer.
Adding an Image to a Single Page
For placing an image on one specific page — a signature on the last page, a logo on the cover — use a PDF Editor with image insertion capability. WukongPDF at www.wukongpdf.com lets you upload the PDF, insert an image file, position it where you need it, resize it, and download the result.
In Adobe Acrobat Pro, Tools > Edit PDF > Add Image opens a file picker. Select the image, and it's placed on the current page as an editable object. Click and drag to reposition it, drag the corners to resize. The image stays as a separate element that can be repositioned or deleted later — it's not permanently merged into the page until you flatten the document.
For precise positioning, use the object properties panel to set exact X/Y coordinates and dimensions rather than dragging by hand. This is important when the image needs to align with specific page elements — a logo that must sit exactly in the top-right corner at a specific margin.
Adding an Image to Every Page
When a logo or image needs to appear on every page — a company header, a "CONFIDENTIAL" stamp, a footer logo — adding it page by page is impractical. Two better approaches:
- Watermark tool: In Acrobat Pro, Edit > Watermark > Add lets you add an image as a watermark that appears on every page at a consistent position. Despite the name, this works for any image overlay — including logos and stamps. Set opacity to 100% for a fully opaque image, lower for a semi-transparent overlay.
- Header/footer tool: In Acrobat Pro, Edit > Header & Footer > Add places content in the page header or footer area on every page. This accepts text or images and provides alignment options (left, center, right) and margin controls.
Image Format Matters: Use PNG for Logos
For logos and graphics placed on PDFs, PNG is almost always the right format. PNG supports transparency — a logo with a transparent background sits cleanly on any page background without a visible white box around it. A JPEG logo always has a white or colored rectangle around it, which looks unprofessional on any page with a non-white background or when overlapping with other content.
Use a high-resolution PNG — at least 300 DPI at the intended display size. A small, low-resolution logo that looks acceptable on screen can appear blurry or pixelated when printed. If your logo file is only available in low resolution, ask your design team for the original vector file (AI or EPS) and export a high-resolution PNG from it.
Adding an Image on Mac With Preview
Preview on Mac handles single-page image insertion through the Markup toolbar:
- Open the PDF in Preview and navigate to the page where the image should go
- Show the Markup toolbar (View > Show Markup Toolbar)
- Click the Insert Image button (a rectangle with a mountain icon) and select your image file
- Drag and resize the image on the page, then save
Preview's image insertion is simpler than Acrobat's but gives less control over exact positioning. For casual image additions it's faster; for precision placement use Acrobat Pro.
When to Add the Image in the Source Document Instead
If the source document (Word, PowerPoint, Google Docs) is available, adding the logo there and re-exporting to PDF produces cleaner results than inserting it into the PDF directly. The logo becomes part of the document structure rather than an overlay annotation, it positions precisely according to the document's layout system, and it's easier to update in the future. Reserve direct PDF image insertion for situations where the source file isn't available or the document needs to go out quickly without a full re-export.