Image Border Adder

The Image Border tool adds customizable borders and frames around any image. Useful for making images stand out on busy backgrounds, giving photos a polished presentation, adding padding before printing, matching a design system\u2019s card style, or creating social media posts with consistent framing. Configure border color, width, style (solid, dashed, dotted), rounded corners, and preset decorative frames.

Upload your image, choose border style, adjust color and width, optionally add rounded corners or a Polaroid-style white matte, and download. The original image stays centered and unchanged; borders are added around the outside. Useful for quickly giving photos a \\\"finished\\\" look for presentations, blog posts, or social sharing. All processing runs in your browser — no upload required.

Border addition uses Canvas operations:

1. Calculate new canvas dimensions: width = image.width + 2*border, height = image.height + 2*border
2. Fill canvas with border color
3. Draw original image at position (border, border)
4. Apply any additional border effects (rounded corners, inner shadows)

For dashed or dotted borders, canvas context.setLineDash([5, 5]) controls pattern. Border is stroked rather than filled.

Rounded corners: clip the final canvas to a rounded rectangle path before exporting. Creates the appearance of rounded image edges with sharp borders.

Polaroid-style (asymmetric border): larger bottom border creates the classic Polaroid look. Typical Polaroid: equal small borders on top and sides, larger bottom border for the white caption space.

Inner border effect: add a contrasting color line inside the outer border for two-tone framing. Common in traditional photography mats.

Gradient border: canvas linear gradient as fill for artistic gradient borders.

Shadow effect: ctx.shadowColor, shadowBlur, shadowOffset for drop shadow behind bordered image.

Decorative frames: preset artistic frame images overlaid as PNG around the photo. More advanced than simple color borders.

Output format:
- PNG preserves transparency and rounded corners perfectly
- JPEG doesn\u2019t support transparency, so rounded corners become solid (background color you specify)
- WebP supports both lossy and lossless with transparency

Size impact: adding borders increases file dimensions proportionally. A 10px border on a 1000x1000 image results in 1020x1020 output. File size increases accordingly.

Aspect ratio: border preserves original aspect ratio of image by adding equal padding. Does not change image proportions.

Multi-layer borders: for multiple borders (like photo matting), apply concentrically: outer border color, gap, inner border color, etc.

Common widths:
- 1-3 pixels: subtle edge definition
- 5-10 pixels: visible frame
- 20-50 pixels: decorative frame
- 50+ pixels: major framing element

Compared to Photoshop borders, this tool is free and browser-based. Photoshop offers unlimited layer effects; this tool covers the common border use cases simply.

Compared to phone photo app frames, this tool allows exact pixel control rather than preset frame widths. Phone apps are faster for casual use; this tool for professional results.

Compared to CSS borders on HTML elements, this tool saves the border as part of the image file — works in email, PDF, or anywhere outside a web browser. CSS only works in web contexts.