Extend an Image Background
Place an existing image on a wider, taller, square, or custom canvas without cropping or stretching it. Solid and Blur modes run locally in your browser.
- Runs in your browser
- No image upload
- Review before download
Choose an image
Select a JPG, PNG, or static WebP and review its current dimensions and ratio.
Choose a canvas and background
Pick a target ratio, then fill the extra centered canvas with a solid color or blurred pixels.
Preview and download
Compare the source and result, verify the output facts, then download or reset.
Review the real output before saving it.
How to extend an image background
- 1. Choose a supported image and confirm its current ratio.
- 2. Select a target ratio and use Solid or Blur for the added canvas.
- 3. Preview the encoded result, check its dimensions and size, then download it.
Background extension without cropping
This tool grows the canvas while keeping the complete source centered. It differs from Crop, which removes overflow, and from ordinary resizing, which changes pixel dimensions directly.
When to use Solid
Solid is predictable for product images, presentations, and clean layouts. JPG always uses an opaque background; PNG and WebP can keep transparent added space.
When to use Blur
Blur works well when a portrait or landscape must fit a different frame without plain borders. The enlarged background and clear centered foreground are encoded into the file.
Common and custom ratios
Choose 1:1, 4:5, 3:2, 16:9, 9:16, or a custom ratio from 1 to 100 per side. The canvas only grows; the source is not cropped or stretched.
Input and output formats
Input supports JPG, PNG, and static WebP. Output supports JPG, PNG, and WebP. Animated PNG and WebP are rejected instead of silently flattening a frame.
Quality and file size
JPG and WebP expose a real encoding-quality control; PNG does not. A larger canvas can make the result larger even when quality is reduced.
Color, metadata, and browser limits
Re-encoding can change color profiles and does not promise to retain metadata. Large images use browser memory, and support depends on the browser's decoder and Canvas encoder.
Local browser processing
Validation, orientation, drawing, preview, and encoding stay in the browser. PicRecast does not send the image to an image-processing service.
Background extender questions
Does PicRecast upload my image?
No. Solid and Blur processing runs locally in your browser, with no external image-processing request.
What is the difference between Solid and Blur?
Solid fills added space with one color or supported transparency. Blur uses enlarged pixels from the same image and places the clear source on top.
Can the added background be transparent?
Yes for Solid output in PNG or WebP. JPG cannot store transparency, and Blur output is intentionally opaque.
Why can the output file be larger?
The result has more canvas pixels and is re-encoded. PNG encoding or a high JPG/WebP quality setting can therefore use more bytes.
Are animation and metadata preserved?
No. Animated PNG and WebP input is rejected, and re-encoding does not guarantee EXIF, ICC, or camera metadata retention.
Related local image tools
Use a focused tool when you need exact pixel dimensions, cropping, compression, or format conversion.