Overview
Introduction
This tool tiles multiple copies of a PNG image into a single strip, entirely client-side, arranged either in a row or a column.
It's a quick way to build a sticker sheet, repeating pattern preview, or filmstrip-style asset from one source image.
What Is PNG Duplicator?
A client-side PNG tiling tool that copies an uploaded image's pixel data into a larger output canvas multiple times, side by side (horizontal) or stacked (vertical), with no gaps or overlaps.
The output dimensions scale directly with the copy count and direction: horizontal tiling multiplies the width, vertical tiling multiplies the height.
How PNG Duplicator Works
The tool first computes the output canvas size (source width times copy count for horizontal, or source height times copy count for vertical), then loops over each copy index and pastes the full source image at the appropriate offset.
Because copies are placed edge-to-edge with no scaling or blending, every copy in the output is pixel-identical to the source.
When To Use PNG Duplicator
Use it to build a sticker sheet from a single sticker design, preview how a pattern tiles when repeated, or create a simple filmstrip-style asset from one image.
It's also handy for quickly generating a wider or taller canvas that's just repeated copies of a smaller source graphic.
Often used alongside PNG Cloner and PNG Rectangle Fitter.
Features
Advantages
- Runs entirely client-side; the uploaded image is never sent to a server.
- Every copy is pixel-perfect, since there's no scaling or resampling involved.
- Simple, predictable row or column layout.
Limitations
- Only a single row or single column layout is supported per run; grid layouts require running the tool multiple times.
- The copy count is capped at 20 to keep the output within the site's maximum supported image dimension.
Examples
Best Practices & Notes
Best Practices
- Use a seamlessly-tileable source image if the goal is a repeating pattern preview, otherwise hard seams will be visible between copies.
- Keep the copy count and source image size in mind together — very large sources with many copies can hit the 4096px output limit.
Developer Notes
duplicatePng is a pure lib function operating on a plain Uint8ClampedArray PixelBuffer: it allocates an output buffer sized for the requested direction and copy count, then pastes the full source buffer at each successive offset — no DOM access until the component paints the result for preview/download.
PNG Duplicator Use Cases
- Building a sticker sheet or print-ready repeated design
- Previewing how a texture or pattern tiles when repeated
- Creating a simple filmstrip-style strip from one source image
Common Mistakes
- Expecting a grid layout in one pass — this tool only tiles in a single row or column per run.
- Using a large source image with a high copy count and hitting the output-dimension limit; reduce either the count or the source size.
Tips
- Combine with the border adder tool afterward to add spacing-style padding between the appearance of tiled copies.
- For a true seamless tile preview, use the png-shifter tool's wrap mode on the source first to check for edge seams before duplicating.