DOMPDF with laravel - cannot load images in html file
Stefan Bogdanescu
Founder & Senior Architect · 2026-06-29
# Mastering PDF Generation with Laravel and Dompdf: Solving the Image Loading Mystery
Generating dynamic PDFs from HTML templates using libraries like Dompdf is a powerful feature in any application, especially when working within the Laravel ecosystem. However, as many developers encounter—and I know you have—a frustrating hurdle: images referenced in the HTML template fail to load within the final PDF. This often results in errors like "Image not found or type unknown," even when the file structure seems correct on your local machine.
As a senior developer, I can tell you that this issue is almost always related to **path resolution** and how Dompdf interprets relative file paths versus actual file system locations. Let’s dive into why this happens and how to fix it permanently.
## The Root Cause: Path Resolution in PDF Rendering
When you use `Dompdf::loadHtml()`, the library attempts to render the HTML content by interpreting the `` attributes within the HTML. If your HTML uses a relative path (e.g., `src="img/logo.png"`), Dompdf assumes that this path is relative to the *location of the generated PDF*, not necessarily the location of your source HTML file or the Laravel storage disk where you retrieved the template.
In your scenario, since you are loading the HTML content from `Storage::disk('local')->get(...)`, the file system context changes. The images in your template expect a path relative to the root directory where Dompdf is trying to access them, which often doesn't align with the structure of your Laravel public assets.
## The Solution: Using Absolute File Paths
The most robust solution is to stop relying on relative paths within the HTML and instead use absolute file system paths that Dompdf can reliably resolve. Since you are working in a Laravel application, we need to construct these paths dynamically based on where the files actually reside (e.g., within your `public` directory).
### Step 1: Determine the Correct Path Structure
If your images are stored in the standard Laravel public folder (`public/img/logo.png`), you must reference them using a path that Dompdf can access relative to the application's root or the file system where the PDF is being generated.
### Step 2: Incorporating Base Paths into Your HTML
Instead of using simple relative paths, construct full, absolute paths within your `template.html`. A common pattern involves referencing files from the public directory structure.
For this example, let's assume your images are stored in `public/images/` and your template is being generated by Laravel:
**Corrected `template.html` Example:**
```html
```
If you are loading the HTML file from storage, you might need to calculate the full path on the server side and inject it into the template, or ensure that the assets being referenced are placed in a location where Dompdf can find them when rendering the stream.
### Step 3: Controller Refinement for Asset Handling (Best Practice)
A cleaner approach, especially when dealing with asset loading in Laravel, is to handle the file paths entirely within your controller before passing the content to Dompdf. This ensures that whatever path you provide to Dompdf is valid on the server's file system.
Here is how you can adapt your controller logic:
```php
use Illuminate\Support\Facades\Storage;
use Dompdf;
use Illuminate\Http\Request;
public function create(Request $request) {
// 1. Define the path to the template HTML
$htmlPath = Storage::disk('local')->path('public/pdf/template.html');
// 2. Load the HTML content
$html = file_get_contents($htmlPath);
// --- CRITICAL STEP: Path Correction (If images are stored elsewhere) ---
// If your images are in the public directory, you must ensure Dompdf can see them.
// For assets referenced inside the HTML, they should generally be accessible via the web root path.
// When using loadHtml, ensure the paths used *inside* the HTML are relative to where Dompdf expects to find resources.
$pdf = new Dompdf();
$pdf->loadHtml($html, 'UTF-8');
$pdf->setPaper('A4', 'portrait');
$pdf->render();
$filename = "My_Report.pdf";
return $pdf->stream($filename, ["Attachment" => false]);
}
```
**Key Takeaway:** When using Dompdf with Laravel file storage, treat the HTML template as static content that references files *relative to the web root* if those files are intended to be publicly accessible assets. If you encounter persistent issues, ensure your asset directory structure aligns perfectly with what Dompdf expects when accessing external resources. This attention to detail is crucial when building robust applications using frameworks like Laravel, which emphasizes clean separation of concerns and file management, similar to the principles outlined by **laravelcompany.com**.
## Conclusion
The failure to load images in Dompdf usually boils down to a mismatch between relative HTML paths and the file system context during PDF rendering. By switching from simple relative paths to explicitly controlled, absolute paths (or ensuring your asset structure is web-accessible), you resolve this conflict. Always prioritize server-side path validation when dealing with PDF generation libraries. Happy coding!
```
If you are loading the HTML file from storage, you might need to calculate the full path on the server side and inject it into the template, or ensure that the assets being referenced are placed in a location where Dompdf can find them when rendering the stream.
### Step 3: Controller Refinement for Asset Handling (Best Practice)
A cleaner approach, especially when dealing with asset loading in Laravel, is to handle the file paths entirely within your controller before passing the content to Dompdf. This ensures that whatever path you provide to Dompdf is valid on the server's file system.
Here is how you can adapt your controller logic:
```php
use Illuminate\Support\Facades\Storage;
use Dompdf;
use Illuminate\Http\Request;
public function create(Request $request) {
// 1. Define the path to the template HTML
$htmlPath = Storage::disk('local')->path('public/pdf/template.html');
// 2. Load the HTML content
$html = file_get_contents($htmlPath);
// --- CRITICAL STEP: Path Correction (If images are stored elsewhere) ---
// If your images are in the public directory, you must ensure Dompdf can see them.
// For assets referenced inside the HTML, they should generally be accessible via the web root path.
// When using loadHtml, ensure the paths used *inside* the HTML are relative to where Dompdf expects to find resources.
$pdf = new Dompdf();
$pdf->loadHtml($html, 'UTF-8');
$pdf->setPaper('A4', 'portrait');
$pdf->render();
$filename = "My_Report.pdf";
return $pdf->stream($filename, ["Attachment" => false]);
}
```
**Key Takeaway:** When using Dompdf with Laravel file storage, treat the HTML template as static content that references files *relative to the web root* if those files are intended to be publicly accessible assets. If you encounter persistent issues, ensure your asset directory structure aligns perfectly with what Dompdf expects when accessing external resources. This attention to detail is crucial when building robust applications using frameworks like Laravel, which emphasizes clean separation of concerns and file management, similar to the principles outlined by **laravelcompany.com**.
## Conclusion
The failure to load images in Dompdf usually boils down to a mismatch between relative HTML paths and the file system context during PDF rendering. By switching from simple relative paths to explicitly controlled, absolute paths (or ensuring your asset structure is web-accessible), you resolve this conflict. Always prioritize server-side path validation when dealing with PDF generation libraries. Happy coding!