Free Stained Glass Pattern Resizer: Upload Your Image, Set Any Size – Get Instant Printable PDF
This free tool is our contribution to the wonderful stained glass community! It works perfectly with any suitable image. To ensure the server remains incredibly fast and available for all artists, we have implemented fair-use limits.
Bookmark this page so you don't lose me!
Why use native AAGlassStudio PNG and JPG files?
Our patterns are explicitly optimized for lightning-fast and high-quality resizing:
Extremely small file size for instant uploads.
Tight cropping with no unnecessary white margins.
Crisp, bright lines that are perfectly easy to trace.
High-quality scaling without pixelation or “dirt”.
Upload Image
Quick User Guide
Upload Your Image
- Supported Formats: JPG, PNG, and WEBP.
- Maximum File Size: 8 Megabytes (MB).
- Drag and drop your image into the blue dashed area, or click the box to browse your files.
To maintain server stability, free generations are limited to 3 attempts per 4 days. If you reach the limit, the tool will pause and show you the exact date and time it will unlock again.
Adjust Size & Proportions
- Measurement Units: Choose Pixels, Millimeters, or Inches.
- DPI (Dots Per Inch): For high-quality printing, leave this at 300 DPI.
- Proportion Lock: By default, the Aspect Ratio Lock is ON (purple). If you change the width, the height will adjust automatically to prevent distortion.
- Quick Presets: Use the 2X, 2.5X, or 3X buttons to instantly multiply your pattern size.
The maximum allowed size for any side of the image is 20,000 pixels.
Choose Your Output Format
- JPG / PNG: Saves as a single large image file.
- PDF A4: Slices your pattern into multiple A4-sized pages.
- PDF Letter: Slices your pattern into multiple US Letter-sized pages.
Pro Tip: Selecting a PDF format reveals a Visual Grid Preview (e.g., “3 × 2 grid (6 pages)”). The app automatically includes a 10 mm margin on every page for easy taping.
Download Your Result
Click the green PROCESS IMAGE button. Wait for the progress bar to finish. Once done, you will see a large blue download button.
Note: The “START OVER” button remains locked until you successfully download your pattern to prevent accidental file loss.
Questions or Suggestions?
Do you have an idea to make this tool even better, or have you encountered an issue?
We are constantly improving our resources for the stained glass community and would love to hear your feedback!
Contact Us
Bookmark this page so you don't lose me!
Got Questions? Check Our FAQ!
Tips for downloading, printing, resizing patterns — plus the tools & materials we use most!