Init Image Converter – A self-hosted batch image converter & resizer on your own server

Key Features

Init Image Converter focuses on practicality: fast batch processing, privacy, and full control over your files.

• Clean web UI: Simple interface – log in, pick your images, choose format & size, then click “Process files”.
• Fully self-hosted: No third-party services – all files are saved locally under /uploads.
• Batch processing: Upload and convert multiple images at once, ideal for content and asset pipelines.
• Format conversion: Convert between JPG, PNG, GIF, and WebP.
• Automatic resize: Limit maximum width to shrink oversized images and speed up page loads.
• Adjustable quality: Fine-tune compression quality for JPG and WebP output.
• Automatic preview: See processed images with size, dimensions, and format right in the UI.
• Flexible download: Download each processed file individually or grab everything as a single ZIP archive.
• Quick cleanup: One-click cleanup to remove all files inside /uploads.
• Login protection: Simple username/password authentication with brute-force rate limiting.
• CSRF protection: All critical actions are protected by CSRF tokens.
• Saved preferences: Last-used settings (output format, max width, quality) are stored using LocalStorage.

Version Information

• Version: 2.0.0
• Last updated: 2026-06-18

System Requirements

• PHP: 7.4 or higher (PHP 8+ recommended).
• Extensions: gd (image processing), fileinfo (MIME detection), zip (for “Download all as ZIP”).
• Write permissions: The uploads/ directory must be writable (chmod 755 or 775).
• Browsers: Optimized for Chrome, Firefox, and Edge.

Installation & Configuration

Once you’ve downloaded init-image-converter.php, setup is straightforward:

1. Upload the file to your server (e.g. https://your-domain.com/init-image-converter.php).
2. Open it in your browser – you’ll see the login screen.
3. Configure your login credentials at the top of the file:

define('USERNAME', 'admin');
define('PASSWORD', 'Admin@123'); // Supports plain text or password_hash

4. Log in with the configured username and password.
5. Select multiple images you want to convert or resize.
6. Choose the output format, max width, and quality.
7. Click “Process files”.
8. Preview the processed images and download them individually or as a ZIP.

To generate a strong password or a password_hash, you can use the
Init Password Generator.

How Init Image Converter Works

After processing, each image entry in the table includes:

• The converted file name.
• Resulting dimensions (width × height).
• File size in a human-readable format.
• Output format (JPG / PNG / GIF / WebP).
• Links to Open and Download the file.

You can also use the “Download all as ZIP” button to fetch all processed files in a single archive, based on the last batch you ran.

Security & Storage

• All images are stored exclusively inside the /uploads directory on your server.
• All critical actions (processing, cleanup, bulk download) are protected by CSRF tokens.
• Login attempts are rate-limited to reduce brute-force attacks.
• No data is sent to external services — everything is offline & private.
• No heavy JavaScript frameworks are used; the UI is lightweight and focused.

Quick Usage Tips

• Place the file in a dedicated folder, such as /tools/ or /admin/.
• Optionally rename it to converter.php or similar for a shorter URL.
• Bookmark the URL in your browser for quick access.
• Works great on local environments (XAMPP, Laragon, etc.) for offline workflows.

Example Workflow

1. Open https://your-domain.com/init-image-converter.php.
2. Log in.
3. Select 10 PNG images.
4. Set max width to 1280px, choose WebP as output, and set quality to 90.
5. Click “Process files”.
6. Download all processed images using the ZIP button.

Why Not Use an Online Converter?

Directory Structure Example

/init-image-converter.php
/uploads/
    ├── image_1700000001_0.webp
    ├── image_1700000001_1.webp
    ├── image_1700000001_2.webp

Technical Notes

• Supported input formats: jpg, jpeg, png, gif, webp.
• Animated GIFs are currently treated as static (first frame).
• You can easily extend the script with custom logic: watermarking, thumbnails, or advanced optimization via GD or Imagick.
• Ideal as an internal tool for your team, your blog, or any self-hosted workflow.

Init Image Converter is the perfect tool if you want fast, private, and fully controlled image conversion and resizing — no cloud lock-in, no hidden limits, just a simple PHP file that gets the job done.