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Crop Image Online

Drag a rectangle, or type exact pixel coordinates. The crop happens on your machine.

Cropping is a coordinate problem in two spaces at once. On screen, your photo is scaled down to fit the preview, so the rectangle you drag lives in display pixels — but the crop you actually want is defined in the image’s natural pixels, which can be five or ten times larger. This tool tracks the exact display-to-natural ratio and does all of its math in natural pixels: the size readout, the X/Y/W/H inputs, and the final canvas draw all refer to real image coordinates, so a “824 × 512” crop is exactly 824 × 512 pixels in the downloaded file. Everything — decode, crop, re-encode — runs in your browser; the image is never uploaded anywhere.

Drop an image here, or

PNG, JPG, WebP up to 32 MB. Stays in your browser.

How to use

  1. Drop your image

    Drag a PNG, JPEG, or WebP file (up to 32 MB) onto the dropzone, or click to choose one. It appears scaled to fit, with a crop rectangle pre-placed over the middle 80% of the frame.

  2. Frame the crop

    Drag inside the rectangle to move it, or drag any of the eight handles to resize. The live readout shows the crop size in natural image pixels, not screen pixels. For exact placement, type values into the X, Y, W, and H fields — they stay in sync with the visual rectangle.

  3. Lock a ratio if you need one

    Pick 1:1, 4:3, 16:9, or 3:2 from the aspect menu to keep the rectangle proportional while you resize. Leave it on Free for arbitrary crops.

  4. Choose a format and download

    PNG preserves the cropped pixels exactly; JPEG and WebP re-encode with the quality slider you set. Click Crop & Download and the file saves as name-cropped.png (or .jpg / .webp) — generated locally, never uploaded.

Frequently asked questions

Is my image uploaded to a server?
No. The file is decoded, displayed, cropped, and re-encoded entirely in your browser using the Canvas API. There is no upload request at any point — Convertitive never sees your image, which also means there is nothing to delete afterwards.
Does cropping lose image quality?
Not if you download as PNG. Cropping itself only selects a rectangle of existing pixels — no resampling happens — and PNG stores that region losslessly, so the cropped area is bit-identical to the original. Quality loss only enters if you choose JPEG or WebP output, which re-encode the pixels at the quality level you pick.
When should I pick JPEG or WebP instead of PNG?
For photographs where file size matters. PNG of a large photo crop can be several megabytes; JPEG at 85–90% quality or WebP at similar settings is usually 5–10× smaller with no visible difference. Stick with PNG for screenshots, diagrams, text, or anything with sharp edges, and note that JPEG flattens transparency onto a white background.
Which aspect ratio should I use for social or profile images?
1:1 for profile pictures and avatars (most platforms display them square or circular), 16:9 for video thumbnails, presentation slides, and social link-preview cards, 4:3 for older display formats, and 3:2 for framing that matches classic photo prints. The Free setting lets you crop to any rectangle when no platform constraint applies.
Will phone photos with EXIF rotation come out sideways?
No. Modern browsers apply the EXIF orientation flag automatically when decoding an image, so a portrait photo from a phone is shown — and cropped — the right way up. The coordinates you see always refer to the image as displayed, and the downloaded crop matches exactly what the rectangle framed.
What is the maximum file size?
32 MB per image, which covers photos from essentially any current phone or camera. Because processing is local, the practical limit is your device’s memory rather than a server quota — very large images simply take a moment longer to decode and encode.

About

Why cropping is lossless but re-encoding may not be

A crop is pure selection: the tool reads the natural-pixel region you framed and copies it, one pixel to one pixel, onto a canvas of exactly that size — no scaling, no interpolation, no color math. What happens next depends on the output format. PNG uses lossless compression, so the file you download decodes back to precisely the pixels you selected. JPEG and WebP (in its lossy mode) instead transform the pixels into frequency coefficients and discard the least visible detail to shrink the file — that discarding is the quality slider. The practical rule: the crop operation never costs you quality; only the encoder can, and only if you choose a lossy one.

Common crop ratios and where they are used

1:1 (square) dominates identity imagery — profile photos, avatars, and app icons — because platforms can safely mask it into a circle. 16:9 is the ratio of modern video and displays, so it fits YouTube thumbnails, stream covers, presentation slides, and the link-preview cards most social networks generate. 3:2 comes from 35mm film and remains the native ratio of most DSLR and mirrorless sensors, which is why standard photo prints (4×6 inch) use it. 4:3 is the older television and compact-camera ratio, still common for tablets and some camera phones. Cropping to the target ratio yourself, rather than letting a platform auto-crop, is the only way to control exactly which part of the image survives.

Sources & references

Authoritative references behind the math, constants, and tables on this page. Verified by Buğra Sözeri on the dates shown and re-checked at every deploy.