Image Padding Adder

Add uniform or custom padding around images with solid or transparent backgrounds.

Tested tool guide Tested browser tools Checked August 16, 2026

What Image Padding Adder does, with a checked example

Image Padding Adder enlarges an image's canvas and places the original image inside the added area. Padding can be equal on every side or set separately for the top, right, bottom, and left, with either a solid color or transparency filling the new space. The original content keeps its existing dimensions. The usual surprise is that opposite sides are cumulative: 10 pixels on both left and right increases the total width by 20 pixels, not 10.

Worked example

A concrete input and expected output from the current implementation.

Input

A 20 x 10 pixel image; top padding 2 pixels, right 3 pixels, bottom 4 pixels, left 5 pixels; transparent background

Expected output

A 28 x 16 pixel image with the original 20 x 10 pixels positioned 5 pixels from the left edge and 2 pixels from the top edge.

The width is 20 + 5 + 3 = 28 pixels, and the height is 10 + 2 + 4 = 16 pixels. The newly added border pixels are transparent.

How the result is produced

Canvas size calculation

Padding expands the outer dimensions without changing the dimensions of the source image. The output width equals the source width plus the left and right amounts. The output height equals the source height plus the top and bottom amounts. Uniform padding applies one amount to all four sides, so that amount is added twice to each dimension.

Placement and background

The left and top settings determine where the source image begins within the enlarged result. The remaining space surrounds it according to the four requested amounts. Transparent padding leaves those added pixels without an opaque color. Solid padding gives the surrounding area the selected color, which is useful when the destination requires a visible border or fixed backdrop.

Good uses

Add equal breathing room around a product image before placing it into a fixed-size catalog tile, while leaving the photographed object at its current pixel size.
Create an intentionally off-center composition by adding more space on one side for captions, controls, badges, or another element that will be added later.
Extend a transparent asset's bounds so that a logo, icon, or cutout has a predictable safety margin when positioned against other page content.

Limits and checks

Check the final dimensions before downloading. Custom values are added to the existing width and height; they do not describe the desired final dimensions.
Transparent padding may appear white, black, or patterned in different viewers. That display color can be the viewer's background and does not necessarily mean the padding is opaque.
Padding adds empty pixels but does not create detail, increase the resolution of the original subject, or make a low-resolution image sharper. The source content remains the same size.

Common questions

Does adding padding resize or stretch the image itself?

No. Padding increases the area around the source rather than scaling its content. A 400 x 300 pixel source with 20 pixels on every side becomes 440 x 340 pixels, while the source portion remains 400 x 300 pixels. Use a resizing tool instead if the image content itself must become larger or smaller.

Will transparent padding remain transparent after I use the result elsewhere?

Not always. The added area can be transparent in the generated image, but transparency must also be supported and preserved by the file format and every later application. A workflow that converts the image to a format without alpha transparency, or deliberately flattens it onto a background, will replace those transparent pixels with a visible color.

References and verification

The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.