File format for large banners or posters

[LloydCain-1957]

Obviously, using the standard jpeg, tiff or png file to create an image to upload for a large poster or banner is not feasible - that is, if we attempt to make it the actual size. So, what is recommended for such images? I'm thinking it may be necessary to create a smaller image (even something like a 16x20 inch) and saving it as a pdf file. Need some good advice on this. Thanks.

[PenguinPower]

You cannot save a pixel based image as a vector based image and expect it to magically gain the ability to be scaled larger than it's original size... It simply doesn't work that way. Only images that are vector based in the first place are infinitely scalable - because they are made of math.... not pixels.  You may stop getting the warning but it will still be pixelated. 
Yes, you do need to have a file that is large enough to meet the minimum resolution necessary for the item you are putting it on and yes, that image may need to be very large.

[VivianD117]

I did a search and here are some suggestions:

Several free online tools can enlarge JPG images. ResizePixel, Adobe Express, and Upscale.media are good options. Upscale.media uses AI to enhance image quality while enlarging. Adobe Express allows you to resize images with a few clicks and offers various aspect ratios. ResizePixel focuses on simplicity and mobile-friendliness. 

Here's a more detailed look at some of the options:

1. ResizePixel:

• Free and easy to use: ResizePixel is a straightforward online tool for resizing images.
• Secure and privacy-focused: It does not collect or share your uploaded images.
• Mobile-friendly: It works well on various devices. 

2. Adobe Express Resize Image Tool:

• Free to use: You can resize JPGs without a subscription.
• Upload your image: Start by uploading your JPG or PNG.
• Choose your size: Select a desired aspect ratio or enter custom dimensions.
• Download or continue editing: Download the resized image or use other Adobe Express features like background removal, filters, or animations. 

3. Upscale.media:

• AI-powered: Uses AI to enlarge and enhance images while maintaining sharpness and minimizing artifacts.
• Up to 8x size increase: Can enlarge images significantly while preserving quality.
• Free to use: Offers a free service for image enlargement. 

4. Fotor:

• AI-powered: Offers an AI-powered photo enlarger.
• One-click enlargement: Enlarge images quickly with a single click.
• Supports various formats: JPG, PNG, and other formats are supported. 

5. Other options:

• PicResize: Offers free online tools for cropping, resizing, and editing images. 

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• Pixlr: A free photo editor with various features, including resizing.