Crop PNG Online

FloxerFile lets you crop a PNG image directly in your browser. Whether you're removing an unwanted border, tightening the frame around a subject, or cutting out distracting edges, set the percentage to trim from each side and your image is cropped accordingly — transparency is preserved throughout, no software, no sign-up.

How it works

1. 1

   Upload your PNG

   Drag and drop your PNG image, or click to browse. Files up to 20 MB are supported.

2. 2

   Set your margins

   Enter the top, bottom, left, and right margins to remove, as a percentage of the image's width or height. Leave a field at 0 to keep that side unchanged.

3. 3

   Crop

   Click Crop PNG. Your image is cropped to the new dimensions on our servers.

4. 4

   Download your cropped PNG

   Download the resulting PNG with the new margins applied and transparency preserved.

Features

• Per-side margin control

  Set independent top, bottom, left, and right margins instead of a single uniform crop.

• Percentage-based

  Margins are set as a percentage of the image's dimensions, so they scale correctly for any image size.

• Transparency preserved

  Cropping keeps the PNG's alpha channel intact — no white or black background gets added.

• Privacy-first

  Files are processed in memory and deleted immediately after download.

• Free & no sign-up

  No account, no credit card. Crop as many images as you need.

• Works in the browser

  No software or plugins needed — upload, crop, and download entirely online.

Supported formats

Output format: .png

Frequently asked questions

What unit are the margins in?

Margins are entered as a percentage of the image's width or height, not absolute pixels. A 10% top margin trims 10% of the image's height from the top, regardless of the image's actual size.

What happens if I leave a margin empty?

Any margin left empty defaults to 0, meaning that side of the image is left untouched.

Can the margins be too large?

Yes. Each margin is capped at 49% individually, but if the combined margins on an axis leave nothing left to show, the tool rejects the request and asks you to use smaller values.

Will cropping remove the transparent background of my PNG?

No. The alpha channel is preserved exactly as it was — cropping only trims the frame, it never flattens or alters transparency.

Can I crop other image formats?

This tool only accepts PNG files. Use Crop Image for JPG or Crop WebP for WebP files.

Are my files kept private?

Your files are processed on our servers solely to perform the crop. They are deleted automatically once the download is complete and are never shared or stored long-term.

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