Altto
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Free · No sign-up · Runs in your browser

Crop an image.

This free image cropper lets you drag out exactly the area you want to keep, free-form or locked to a square, 4:3 or 16:9 ratio, without a single file leaving your device.

Not uploaded — nobody sees it Free-form or locked ratio Keeps PNG transparency No subscription or account
Your file is never uploaded — it’s processed right here in this browser tab, on your device. It never reaches a server, so we never see it, copy it or keep it.

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At a glance

Image cropper: quick facts

Crop a JPG or PNG freely or to a fixed shape.

Updated

Price
Free. No sign-up, no watermark.
Shapes
Free, Square 1:1, 4:3 or 16:9.
Quality
Cropped from the full-resolution original; PNG transparency is kept.
Shows
The exact pixel size of your crop as you drag.
Privacy
Your image stays in your browser and is never uploaded.
How it works

How to crop an image to the shape you need

Drag a box over the part you want to keep, free-form or locked to 1:1, 4:3 or 16:9, and download just that area at full resolution, in the same format as your original.

  1. 01

    Add your image

    Drop in a JPG or PNG file.

  2. 02

    Drag the crop area

    Move or resize it, optionally locked to a ratio.

  3. 03

    Download the result

    Cropped at your image’s full original resolution.

Tips

Tips for a well-framed crop

A few habits for crops that look deliberate rather than accidental.

  • Choose the ratio before fine-tuningPicking a ratio resets the crop box to a centred starting position, so any dragging you’ve already done is lost. Choose Free, Square 1:1, 4:3 or 16:9 first, then move and size the box.
  • Keep an eye on the pixel readoutThe size shown under the box is the size you’ll download. If a site asks for a minimum, such as 1,080 pixels wide, make sure the readout stays above it as you tighten the crop.
  • Leave room for round profile picturesMany apps show profile photos as a circle, which trims the corners off a square crop. Keep the face near the centre with a little space around it, rather than filling the square edge to edge.
  • Crop for shape, then resize for sizeCropping sets the shape, but the pixel size depends on how much you keep. For an exact size such as 1,280 × 720, crop to 16:9 here, then set the pixels with Image Resize.

Like every Altto tool, this runs on your device — nothing you add is uploaded. How Altto works

16:9

is the shape of HD video, YouTube thumbnails and widescreen TVs. Pick it for anything that will fill a screen or sit in a video player.

FAQ

Frequently asked questions

The finer points of cropping one image at a time. For how cropping fits with resizing and compressing, see our guide on how to resize an image. Cropping a photo for a UK passport application? Check the result with our passport photo checker. Cropping a picture for a meme? See how to make a meme.

How do I crop to a specific shape, like a square?
Pick one of the aspect-ratio presets (Square 1:1, 4:3 or 16:9) before adjusting the crop box — it'll snap to and stay locked to that shape as you drag the corners. Choose Free for no restriction at all.
Can I move and resize the crop area?
Yes — drag inside the box to move it, or drag any of the four corner handles to resize it. It's clamped so it can never go outside the image.
What size will my cropped image be?
Exactly the pixel dimensions shown under the crop box, taken from your original image's full resolution — not the smaller preview size shown on screen, so you don't lose quality by cropping tighter.
What image formats are supported?
JPG and PNG. The cropped output keeps the same format as your original, so a PNG's transparency is preserved rather than flattened.
Can I crop to a portrait shape like 4:5 or 9:16?
There’s no portrait preset yet — 4:3 and 16:9 are both landscape. Choose Free and watch the pixel readout under the box instead: for 4:5, aim for something like 1,080 × 1,350, and for 9:16, 1,080 × 1,920, or any size in the same proportion.
Can I rotate or straighten a photo here?
Not at the moment — the cropper cuts a rectangle from the image as it is. If a photo is sideways, rotate it in your phone’s or computer’s photo app first, save it, then crop the saved copy here. Straightening a tilted horizon needs a photo editor too.
Does cropping lower the quality?
Not in any way you’d notice. A PNG stays a lossless PNG. A JPG is saved again at a high quality setting, which adds a tiny amount of compression, so crop from the original photo rather than a copy you’ve already cropped and saved several times.
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