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// PREVIEW
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// crop images to exact dimensions, 100% in browser
Crop images to exact dimensions instantly in your browser. No upload, no server, 100% private. Supports JPEG, PNG, WebP, and GIF.
Drop an image here
or
JPEG · PNG · WebP · GIF
Drag and drop or click Browse to open JPEG, PNG, WebP, or GIF files.
Drag the crop box to position it. Drag handles to resize. Type exact pixel dimensions for precision.
Choose output format and quality, then click Crop & Download to save instantly.
Image Cropper lets you select any rectangular region of a photo and export it at exact pixel dimensions — entirely in your browser. Your image never leaves your device, so your files stay private.
No. Everything happens entirely in your browser using the HTML5 Canvas API. Your image never leaves your device, which means your files are fully private and the tool works even offline after the page loads.
You can open JPEG, PNG, WebP, and GIF files. For output, you can download as JPEG, PNG, or WebP. GIF animation is not preserved — the first frame is used for cropping.
Yes. Type the exact width and height in pixels in the size inputs above the canvas. The crop box will resize to match. You can also lock the aspect ratio to maintain proportions while dragging.
When locked, the crop box maintains a fixed width-to-height ratio as you drag handles. Click the 🔓 lock button to toggle. Preset ratios like 1:1, 16:9, 4:3, and 3:2 automatically enable the lock.
For JPEG and WebP, 80–92% quality gives excellent results at a smaller file size. PNG is lossless so quality doesn't apply. For web thumbnails, 80% JPEG is a common sweet spot between quality and performance.
There's no hard limit — the tool relies on your browser's Canvas API and your device's RAM. Very large images (50+ megapixels) may be slow on low-end devices. For best performance, keep source images under 20 megapixels.
Cropping an image shouldn't mean uploading it to a third-party server, waiting for processing, and worrying about where your files end up. The JLV DevTools Image Cropper does all the work directly in your browser using the HTML5 Canvas API. From the moment you open a file, every pixel of your photo stays on your own device.
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When you load an image, it is drawn onto an HTML5 <canvas> element. The crop box you drag around defines a rectangular region in the image's native pixel coordinates. When you click "Crop & Download", the tool reads the crop region from the canvas using drawImage() with source rectangle parameters, then writes the result to a second off-screen canvas at the exact output dimensions you requested. The final image is exported using canvas.toBlob() and downloaded to your machine — no network request involved.
This approach means the tool is fast, private, and works on any device with a modern browser. Chrome, Firefox, Safari, and Edge all support the Canvas API features used here.
Different platforms have different ideal image ratios, and manually calculating crop coordinates in a desktop editor wastes time. With Image Cropper you can pick a preset ratio — 1:1 for Instagram posts, 16:9 for YouTube thumbnails and Twitter cards, 4:3 for Facebook, 3:2 for print — and the crop box snaps to that ratio immediately. You then drag it to the most important part of the image and download.
Designers and developers often need images at very specific pixel sizes — a 400 × 300 card thumbnail, a 64 × 64 avatar, or an 800 × 200 hero strip. The width and height inputs accept any positive integer. When you type a value, the crop box resizes accordingly. If aspect ratio lock is on, the other dimension updates automatically to maintain the ratio.
This precision makes the tool particularly useful when preparing assets for HTML templates, React components, or CMS content where image containers have fixed dimensions and poorly-sized images cause layout shifts.
The crop box shows a subtle rule-of-thirds grid — two horizontal and two vertical lines dividing the selection into nine equal parts. Placing your subject near one of the four intersection points (the "power points") generally produces more visually engaging results than centering everything. This is a guideline used by photographers and graphic designers to create balanced yet dynamic compositions.
After cropping, you can download in three formats:
The quality slider applies to JPEG and WebP. PNG ignores it because PNG is always lossless. For most web use cases, WebP at 85% gives excellent quality at minimal file size.
Many online image tools process your images on a remote server. This raises legitimate concerns: the server might log your files, store them for analytics, or be subject to a data breach. With a fully client-side tool, none of that is possible because the image data never travels over the network at all. The tool runs as JavaScript in your browser tab — it reads your file via the File API and draws it to canvas entirely in memory on your own hardware.
This also means the tool works offline once the page has loaded, has no rate limits, and imposes no file size restrictions beyond what your device can handle in RAM.
All interactive controls are keyboard-accessible. The crop size inputs accept direct values you can type, the aspect ratio buttons are focusable, and the download action is a standard button element. ARIA labels are applied throughout so screen readers can describe the crop area and controls clearly.