Transparent PNG Border Trimmer
Automatically remove transparent borders from a PNG using an adjustable alpha threshold without guessing a background color.
Your input is sent to this site only after you choose Convert on server. The conversion runs for this request and no history is saved. Upload up to 4 MiB combined; Office files have a 2 MiB limit.
Choose your file
Choose a file or load the example to see how the converter works.
Choose your options
The defaults work for most files. Change a setting only when you need to.
How to use Transparent PNG Border Trimmer
- Load the working example or provide your own input.
- Review the format options, then select Convert on server to process the input.
- Check the result and download the output file.
What this tool does
Tighten the canvas around a cutout, icon or transparent export without selecting crop coordinates manually. The tool scans the PNG alpha channel to find pixels above the chosen threshold, then crops to their combined bounding rectangle. At the default threshold, only fully transparent pixels are ignored, preserving faint antialiased edges.
Supported formats and limits
This does not remove an opaque background or detect an object by its color. Raising the threshold can trim faint shadows and translucent details, so compare the output with the original. A completely transparent image has no visible bounding rectangle and returns an error. Only still PNG input is supported, within 4 MiB and 16 million pixels. The result is re-encoded as PNG and does not preserve arbitrary source metadata.
What should I check before using the result?
This does not remove an opaque background or detect an object by its color.
Is input uploaded?
This tool sends input to this site’s conversion API after you select Convert on server. Files use bounded workers and, when needed, private temporary folders deleted after processing or cancellation. No conversion history is saved. The converter does not upload files to a third-party conversion service.