Add Border to Image
Add a solid-color border or frame around your JPG, PNG, or WebP image directly in your browser. Choose a border width and color, preview before and after dimensions, and download without uploading files.
What this tool does
NexKit Add Border to Image expands the canvas around a JPG, PNG, or static WebP image and fills the new area with one solid color, creating a simple photo frame or border effect.
Because the border is added outside the original pixels, the output width and height each grow by twice the chosen border width. For example, a 1200 x 800px image with a 40px border becomes 1280 x 880px. This is expected behavior, not a resolution or quality change.
How to add a border to an image
Upload one or more JPG, PNG, or static WebP images, choose a border width from the presets or enter a custom value in pixels, then pick a border color with the color picker or a #RRGGBB hex value.
Compare the original image with the bordered result in the preview panel, which shows the exact before and after pixel dimensions. When it looks right, apply the border to every selected image and download results individually or as a ZIP.
Supported image types
This MVP accepts JPG, PNG, and static WebP images up to the same size and pixel limits as other NexKit image tools.
GIF, APNG, animated WebP, SVG, HEIC, AVIF, TIFF, BMP, and unknown formats are rejected. Animated images are not silently converted to their first frame.
Border width and color
This MVP applies one uniform border width to all four sides using common presets (10px, 20px, 40px, 80px) or a custom value from 1px to 500px, plus one opaque solid border color.
Per-side border widths, rounded corners, gradient borders, and patterned or image-based frames are not part of this MVP.
Transparency and pixel data
The border fill never blends into the original image area - only new opaque border pixels are added around it. For PNG, the original decoded pixel and alpha values inside that area come through exactly (PNG re-encoding in the browser is lossless for this use). For WebP, the browser re-encodes the whole image, including the untouched interior, so pixel and alpha values can shift slightly even though transparency itself is preserved as a feature - do not expect a byte-exact match for WebP.
JPEG output has no alpha channel, so border pixels are simply opaque like the rest of a JPEG image. JPEG always re-encodes lossily, including the original image area, so expect small color shifts there too.
Privacy and local processing
Images are composited locally in your browser for this tool. NexKit does not upload selected images, generated image blobs, source filenames, or image contents to a server for this workflow.
Exporting through the browser canvas does not carry forward the original EXIF, GPS, DPI, PNG text chunks, or the original ICC color profile - none of these are preserved. JPEG and WebP output may contain a color profile, but it is a fresh profile generated by the browser's encoder, not the source file's original profile.
Frequently Asked Questions
Are my images uploaded?
No. Add Border to Image processes JPG, PNG, and static WebP files locally in your browser. The selected files and generated outputs are not uploaded to NexKit servers by this tool.
Which image formats are supported?
This MVP supports JPG, PNG, and static WebP images. GIF, APNG, animated WebP, SVG, HEIC, AVIF, TIFF, BMP, and unknown formats are rejected.
Does adding a border change the image dimensions?
Yes, intentionally. The border is added outside the original image content, so the output width and height each grow by twice the chosen border width. This is not a resolution or quality improvement.
Can I use a different width on each side?
Not in this MVP. One uniform border width is applied to all four sides. Per-side widths, rounded corners, and gradient or patterned borders are not included.
Does this preserve transparency?
Yes, transparency itself carries through for PNG and WebP - the tool does not flatten or discard an alpha channel. For PNG the original pixel and alpha values are reproduced exactly. For WebP the browser re-encodes the whole image and can shift pixel/alpha values slightly, so treat WebP output as visually equivalent, not byte-exact. The added border area is always fully opaque at the chosen color.
Does this change the output format?
No. Output preserves the source format: JPG stays JPG, PNG stays PNG, and WebP stays WebP.
Can I process multiple images?
Yes. One shared border width and color is applied to every selected valid image, and successful outputs can be downloaded individually or packaged as a ZIP.
Does this preserve metadata?
No. The original EXIF, GPS, DPI, PNG text chunks, and the original ICC color profile are not preserved - browser canvas export does not carry them forward. JPEG and WebP output may contain a color profile, but it is freshly generated by the browser's encoder, not the source file's original profile.