Image Size Reducer
PNG cropper

Crop a PNG

Draw a box around the part worth keeping and throw the rest away. Fine-tune the edges, lock an aspect ratio if you need one, and export a PNG that loses nothing in the process.

  • Drag a rectangle over the area to keep
  • Adjustable edges and a lockable ratio
  • Quick trim of empty transparent borders
  • Transparency kept outside the box
  • Cropped in the browser, nothing uploaded
Open the crop tool

The Edit That Decides Everything Else

Cropping is the only operation that removes pixels instead of changing them, and that makes it the most consequential choice in the whole edit.

Color, blur, contrast: every other adjustment works on the image you already have. Cropping is different, because it subtracts. Whatever you leave inside the box is the picture from then on, and whatever falls outside is gone for good. That is why a crop is worth more thought than it usually gets. It sets the composition, decides the aspect ratio, and determines how the image will sit in a layout before anything else is applied. When you crop a PNG, you are not polishing an existing picture, you are deciding which picture it is going to be.

What the Crop Tool Does

A rectangle is drawn over an image, adjusted until the frame is right, and exported as a PNG with its transparency preserved.

Rectangle selection

Draw a box over the area to keep, with edges and corners you can drag to fine-tune the frame.

Aspect ratio lock

Lock square, widescreen, or portrait before drawing, so the result matches the slot it is going into.

Trim transparent borders

Remove the empty transparent margin around artwork in one move, so it aligns properly in a layout.

Transparency preserved

Only pixels outside the box are removed. Transparent areas inside it stay transparent.

Local processing

The crop is applied in the browser, so the image never leaves the device.

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Cropping is choosing

There is no neutral crop. Moving the rectangle even slightly changes what the eye lands on first, which relationships survive, and how much empty space the image carries. Two crops of the same photograph can feel like two different photographs. That is why it is worth starting from a question rather than a border: what should the viewer notice. Once that is settled, the box usually places itself, and the remaining adjustments are about how much room to leave around the subject rather than where to cut. When you crop a PNG, that single decision quietly sets the composition for every use that follows.
Crop this image
Two crops of the same photograph that emphasise different subjects
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Trim the empty margin first

Many PNGs arrive with a wide transparent border around the actual artwork, left behind by an export, a screenshot, or a canvas that was larger than the drawing. That dead space is invisible until the file is placed in a layout, where it throws off alignment and makes the image look smaller than it is. Trimming it is a special case of cropping that takes seconds and fixes several problems at once. Once the transparent margin is gone, the image sits flush wherever it is used, and any padding becomes something the layout controls rather than something baked into the file.
Crop this image
A PNG with a wide transparent border beside the same file trimmed to the artwork
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Aspect ratio comes before the subject

If the image is destined for a particular slot, the ratio has to be decided first, because it constrains where the box can go. A square crop, a sixteen by nine banner, and a four by five portrait each pull the eye differently. Locking the ratio before drawing is what keeps the result predictable. It also makes a set of images consistent: a row of thumbnails cropped to the same ratio looks like a designed grid, while one cropped by eye looks like a mistake. Whenever you crop a PNG that has to match a slot, decide the ratio before you touch the subject.
Crop this image
The same image cropped to square, widescreen, and portrait ratios
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Where to place the subject

The classic guidance still holds: placing the subject slightly off-center, rather than dead in the middle, makes an image feel more alive. A face wants space in front of it, in the direction it is looking, and a moving object wants room to travel into. The edges matter as much as the center. Cropping exactly through a joint, an ankle or a wrist, looks like an accident, while cutting at a natural gap reads as deliberate. When you crop a PNG, a few pixels of adjustment at the border are often the difference between a mistake and a composition.
Crop this image
A subject placed slightly off-center with room in the direction of travel
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Transparency survives the crop

A crop only removes pixels outside the box; it does not touch what is inside. If the kept area contains transparent regions, they stay transparent, which matters for cut-out logos, icons, and signatures. That means you can crop a PNG with a transparent background and still place the result straight onto a colored layout without a white box appearing. It also means a crop is safe to use as a first step before other edits, since no part of the transparency is flattened.
Crop this image
A cropped PNG with transparent areas still transparent on a colored background
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Cropping does not cost quality

Unlike resizing, cropping is lossless. The pixels inside the box are the original pixels, untouched and unresampled; nothing is interpolated and nothing is smoothed. That makes cropping the safer of the two operations and the one to reach for first. Removing the parts you do not want reduces the file size without degrading the parts you keep, and any resizing can be done afterwards on the smaller, tighter image.
Crop this image
Kept pixels identical to the original after a crop
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Crop or resize

The two are often confused, and the difference is simple. Resizing rescales every pixel and changes the proportions unless the ratio is preserved. Cropping removes pixels and changes what is in the frame. If the goal is to fit an image into a smaller space, that is a resize. If the goal is to fit it into a shape, or to remove something unwanted, that is a crop. Whenever you crop a PNG you are subtracting, and whenever you resize one you are stretching, and reaching for the wrong one is why images end up squashed or with an accidental thin strip of background along one edge.
Crop this image
A squashed resize beside a proper crop of the same image
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Made in the browser

Cropping is often the last tidy-up before publishing, applied to a private photo, an unreleased product shot, or a client's logo. The selection and the export happen on the device. There is no upload and no account, so the image is never in transit for what is, in the end, a single rectangle.
Crop this image
A crop rectangle being positioned over an image in a browser window

How to Crop a PNG

Four steps. The second is the only one that needs judgement, since it sets the composition for good.

Step 1

Upload the image

Start from the original file rather than an already-compressed copy, so the kept pixels are the best available.

Step 2

Draw the rectangle

Drag a box over the area worth keeping, placing the subject slightly off-center and leaving room in the direction it faces.

Step 3

Fine-tune the edges

Pull the handles in or out, and lock an aspect ratio if the image has to match a specific slot.

Step 4

Download the PNG

Export the result. Pixels inside the box are unchanged, and any transparency within it is preserved.

Who Crops PNGs

Four kinds of work where the frame has to be decided.

SM

Social media managers

post images and thumbnails

Every platform wants its own ratio. Cropping one master image into a square and a story format keeps them consistent instead of looking like different posts.

OS

Online sellers

product photos

Product shots often come with too much empty space. Trimming to the item makes the grid tidy and lets the listing do the padding itself.

DE

Designers

assets and icons

Exports landing with an oversized transparent canvas is a daily annoyance. A tight crop fixes alignment everywhere the asset is used.

PH

Photographers

framing and delivery

A quick crop decides how a shot is read before any color work. Placing the subject off-center takes a second here rather than in a full editor.

Frequently Asked Questions

How cropping works, and how it differs from the edits it is often confused with.

Keep the part that matters

Upload an image, draw the box, fine-tune the edges or lock a ratio, and export a cropped PNG with its transparency intact.

Crop this image
Subtract, Do Not Adjust

Every other edit works on the image you already have

Brightness, contrast, color: all of them reshape the picture without changing what is in it. Cropping is the exception. It subtracts, and once a pixel is outside the box it is gone, which makes the rectangle the most consequential decision in a quick edit rather than the least. Decide the ratio before the subject if the image has a slot to fill, place the subject slightly off-center and leave room in the direction it faces, and check the borders, since a crop that lands exactly on a joint looks like an accident. Trim the transparent margin when a PNG arrives with too much of it, and reach for cropping before resizing, because removing pixels costs no quality while rescaling them does. Do all of that, and the moment you crop a PNG becomes the fastest useful edit there is, and often the one that matters most.

Smaller files, same picture.