1
Open an image
JPG, PNG, or WebP
Choose an image or drop it hereJPG, PNG, WebP · local processing
The source stays on this device. Only Use in Rasterbator writes the generated crop to local IndexedDB so the poster maker can reopen it.
Free Image Cropper for Exact Print Ratios and Poster Framing
Crop an image locally to precise pixels or paper ratios, then check its 300 DPI print size before poster layout.
Crop the real source before you size the poster
Browser Canvas decodes, crops, and exports locally. Drag the frame, pull a corner, or type exact X/Y/W/H pixels without sending the source to a server.
2
Frame the crop
Drag, resize, lock a ratio, or type exact pixels
Upload an image to reveal the draggable crop frame.
Crop shapeStandard rectangle crop
Aspect ratioFree crop
A4 portrait uses 210 × 297 mm and a 1:1.4142 ratio. Letter uses 8.5 × 11 in. Poster portrait uses 2:3, including common 24 × 36 in artwork.
3
Check and export
Pixels, print size, format, and poster handoff
Choose a crop to preview the exported file.
Cropped pixels—
Aspect ratio—
Effective print size @300 DPI—
Estimated export size—
File size is an estimate based on pixel count and format; the exact compressed size depends on image detail. The generated Blob is the file used for download and Rasterbator handoff.
Use crop pixels as a print decision, not just a visual frame
The crop box defines the exact pixels that survive. That makes framing, paper ratio, and usable print size visible before the file enters a tiled poster workflow.
Match the composition to the paper shape
A4 is 210 × 297 mm with the familiar 1:1.4142 ratio. Letter is 8.5 × 11 in, while a 2:3 poster ratio fits sizes such as 24 × 36 in.
Locking one of those ratios keeps the crop frame in that shape while you drag a corner. Free mode removes the ratio constraint when the composition matters more than a standard paper shape.
Use exact coordinates when dragging is not precise enough
X and Y set the crop origin in source pixels. W and H set the surviving pixel dimensions, so you can repeat a crop or align it to artwork measurements without estimating by eye.
When a ratio is locked, changing W or H adjusts the other dimension and keeps the rectangle inside the source image.
Translate cropped pixels into physical print size
At 300 DPI, every printed inch needs 300 pixels. A 2550 × 3300 px crop therefore maps to 8.5 × 11 in before any printer-specific bleed is added.
The live readout shows inches and centimeters for the current crop so you can decide whether to continue, resize, upscale, or choose a different frame.
Make the crop fit the real print, room, and subject
Paper shape, viewing distance, subject scale, and edge content should guide how much of an image survives.
Start with the physical format
Paper size should come before framing. A 16 × 20 in print uses a 4:5 crop, every ISO A-series sheet keeps the 1:1.4142 relationship, and a 2:3 crop matches formats such as 24 × 36 in.
Measure the intended wall area, frame opening, or paper stock before trimming pixels. A free image cropper for printing is most useful when the final physical shape is known before composition decisions become irreversible.
Crop differently for near and far viewing
Viewing distance changes how aggressively you can crop. A large poster seen from across a room can tolerate a tighter frame because the subject still reads clearly at distance.
For a small proof, desk print, or hand-held sample, leave more breathing room around the subject. Close viewing makes clipped edges and crowded borders feel more obvious than they do on a monitor.
Judge subject scale with the print readout
Subject scale matters as much as crop ratio. A person, product, or focal object that feels large enough on screen can still look unexpectedly small once the image is printed at the chosen paper size.
Use the live 300 DPI dimensions to judge that tradeoff before export. An image cropper for printing should help you compare framing with realistic physical size, not imply that cropping creates extra image detail.
Know when the edge is part of the artwork
Some images should not be cropped at all. Collages, composites, scanned artwork, and layouts with captions, signatures, borders, or intentional edge details may use the outer area as part of the content.
If removing an edge changes the meaning, balance, attribution, or designed boundary, keep the full frame. Resize or upscale instead when the problem is output dimensions rather than unwanted composition.
Square crops for avatars and social posts
The 1:1 preset locks a perfect square — the exact ratio profile photos, avatars, and square social posts need. Pick 1:1, drag the handles, and export at full resolution.
Crop images into a circle
Flip the crop shape to circle for avatars and round badges. The export keeps a square canvas with transparent corners, so the round cutout stays clean on any background.
Nothing to install, nothing to sign up for
The editor runs in this browser tab. Open the page, drop a photo, crop, and download — the file never leaves your device.
Crop an image for printing in three browser-local steps
Open the source file
Pick a JPG, PNG, or WebP file from your device. The browser reads its true pixel dimensions locally and initializes the crop frame to the complete source.
Choose the frame
Move the crop box, resize it from a corner, choose a print ratio, or type exact X/Y/W/H pixels. The numeric controls and canvas stay synchronized.
Export the same reviewed crop
Check cropped pixels, ratio, 300 DPI print size, and estimated file size. Then download the generated Blob or send that exact Blob into Rasterbator as a local draft.
Image cropper questions before poster printing
Is this image cropper free?
Yes. The cropper runs in your browser with no account, watermark, or paid export step. You can crop a supported image, download the result, or pass it into Rasterbator locally.
Does Rasterbator upload my image while I crop it?
No. Browser Canvas decodes, crops, and exports locally. The generated Blob enters local IndexedDB only when you choose Use in Rasterbator so the poster maker can open the same cropped file.
Which image formats can I crop?
You can open JPG, PNG, and WebP files. Export is available as PNG or JPG; PNG can preserve transparency while JPG uses 90% quality and places transparent pixels on white.
Should I crop before or after using Rasterbator?
Crop first when composition or paper ratio is the decision you need to make. Then use the cropped result in Rasterbator so the poster layout starts from the exact framing you already approved.
Should I crop an image or resize it?
Crop when you need to remove edges or change framing. Resize when you want to change pixel dimensions while keeping the full composition. If the source is too small after cropping, upscale it before the final poster layout.
How many pixels do I need for a 300 DPI print?
At 300 DPI, one inch needs 300 pixels. Divide the cropped pixel width and height by 300 to get print inches, then multiply by 2.54 for centimeters. For example, 2550 × 3300 px is 8.5 × 11 in at 300 DPI before any printer-specific bleed.
Can I crop an image into a circle?
Yes. Switch the crop shape to Circle and the frame locks to a square with a round mask. Circle exports are PNG with transparent corners — JPEG cannot store transparency, so the JPG option is disabled while Circle is active.