How to Add an Image to a PDF Free Online

Need to drop a logo, signature image, or photo into a PDF? Whether you're adding a company logo to a letterhead, inserting a handwritten signature scan, or placing a diagram into a report, adding an image to a PDF is a common task — and you can do it for free without installing any software.

Why Add an Image to a PDF?

There are more reasons than you might think:

Logo branding: Add your company logo to invoices, proposals, or reports
Handwritten signatures: Scan your signature and place it on contracts
Photos and diagrams: Insert product photos, charts, or technical diagrams
Stamps: Add "APPROVED," "CONFIDENTIAL," or date stamps
Watermarks: Place semi-transparent images over pages for branding or protection

What Image Formats Work?

Most PDF image tools support the common formats: JPG, PNG, GIF, WEBP, and BMP. PNG is generally the best choice for logos and graphics because it supports transparency — meaning you can place a logo without a white box around it. JPG is fine for photos.

Method 1: Online Tool (Easiest, No Install)

The simplest way to add an image to a PDF is with an online PDF editor. The process is straightforward:

Open a PDF editor and upload your PDF file
Click the image/insert option in the toolbar
Upload your image file (JPG, PNG, etc.)
Drag the image to the correct position on the page
Resize and rotate as needed
Save and download your updated PDF

Online tools handle this in your browser — your files aren't uploaded to any server, so your data stays private. This matters if you're adding images to sensitive business documents.

Method 2: Add a Signature Image

If you need to add a scanned handwritten signature to a PDF, here's the cleanest approach:

Sign a piece of white paper with a dark pen
Photograph or scan it — use a document scanner app on your phone for best results
If the background is white, use an image editor to remove the white background and save as PNG with transparency
Insert the PNG into your PDF at the signature line

The PNG transparency trick is the key. With a transparent background, your signature looks natural on the PDF instead of having a white rectangle around it.

For legal documents, note that scanned signatures are generally legally valid, but some high-stakes documents require a proper digital signature with cryptographic verification.

Method 3: Adobe Acrobat (If You Have It)

Adobe Acrobat Pro has an image insertion feature:

Open the PDF in Acrobat Pro
Go to Tools > Edit PDF
Click "Add Image" in the toolbar
Select your image file
Click where you want to place it
Resize and position using the handles
Save the file

Acrobat gives you precise control over image placement, layering, and opacity. The downside is the subscription cost — Acrobat Pro runs around $25/month. For occasional image insertion, a free online tool is more practical.

Method 4: LibreOffice Draw (Free Desktop App)

LibreOffice Draw is a free, open-source alternative that can open PDFs and insert images:

Open LibreOffice Draw
File > Open your PDF
Insert > Image to add your image file
Position and resize it
Export as PDF: File > Export as PDF

LibreOffice can be slow with large PDFs and sometimes reformats text slightly on export. It's fine for simple documents but can cause layout issues with complex ones.

Method 5: Preview on Mac

Mac users have an easy option built right in:

Open the PDF in Preview
In the toolbar, click the Markup toolbar button (pencil icon)
Drag an image file directly onto the PDF page
Resize and reposition it
Save

Preview supports JPG and PNG. For transparent PNGs, it preserves transparency. This is probably the fastest method if you're on a Mac.

Tips for Adding Images to PDFs

Image Resolution Matters

For print, use images at 300 DPI or higher. For digital-only PDFs, 72-150 DPI is fine. Low-resolution images look blurry when scaled up — especially logos. If you're adding a company logo, get the original high-resolution version, not a screenshot.

PNG vs JPG for Logos

Always use PNG for logos. PNG supports transparency, which means no white background box around your logo. JPG doesn't support transparency — you'll get a white rectangle around the image.

Keep Image File Sizes Reasonable

High-resolution photos can significantly increase PDF file size. If the PDF is getting too large after adding images, compress the PDF after you're done editing. This reduces size without noticeable quality loss for screen viewing.

Check Alignment

Most PDF editors have alignment guides that snap images to the center, edges, or other elements. Use these to ensure your logo or stamp is placed precisely where it should be.

Layer Order

In PDF editing, images can be placed on top of or behind existing content. If your image is covering text you need to keep visible, look for a "Send to Back" or "Move to Background" option.

Adding Images to Multiple PDF Pages

Need to add a logo to every page of a long document? Doing it manually page by page is tedious. Look for batch or repeat options in your tool:

Some online tools let you add an image to all pages at once
Acrobat Pro has a "Place on All Pages" option
For watermarks specifically, use a dedicated watermark tool which applies the image to all pages

What If the Image Doesn't Look Right?

Common issues when adding images to PDFs:

Image Appears Blurry

The source image resolution is too low. Get a higher-resolution version of the image. Don't try to enlarge a small image — it won't improve quality.

White Box Around the Logo

You're using a JPG instead of PNG. Convert the logo to PNG with transparency. Most graphic tools and even some online converters can remove white backgrounds from logos.

Image Is on the Wrong Layer

If the image appears behind text and you can't see it, or it's covering text you need, adjust the layer order. Look for "Bring to Front" or "Send to Back" in your tool.

The PDF Becomes Huge

Large image files increase PDF size significantly. Compress the PDF after adding images to bring the file size back down.

Privacy Considerations

If you're adding images to sensitive documents — contracts, legal filings, medical records — think about where your files go. Some online PDF tools upload files to their servers, where they might be stored or analyzed.

Look for tools that process files locally in your browser. These tools run everything on your device — your PDF and your image never leave your computer. PeacefulPDF processes files in your browser for exactly this reason.

Common Use Cases

Business Documents

Adding a company logo to invoices, proposals, or letterheads is one of the most common uses. Export your invoice template as a PDF, then add the logo on top. Or add it to an existing PDF invoice you received.

Real Estate and Legal Contracts

Agents and lawyers often need to add initials, signature images, or stamps to contracts. A scanned signature as a transparent PNG works well for this.

Educational Materials

Teachers add diagrams, charts, and images to PDF worksheets or lesson materials. A free online tool handles this quickly without needing Acrobat.

Medical Records

Adding scan images or annotating existing medical PDFs. Privacy is critical here — use a browser-based tool that doesn't upload files.

The Bottom Line

Adding an image to a PDF is straightforward once you have the right tool. For most people, a free online editor is the quickest and easiest option — no install, no subscription, and your files stay on your device. Use PNG for logos (preserves transparency), JPG for photos, and compress the PDF afterward if file size becomes an issue.