Image Resizer

Every destination wants images at its own size: the form says maximum 800×800, the listing wants 1200×628, the print shop asks for exact pixels — and your source photo is whatever the camera produced. This tool scales any image to the precise dimensions you type, entirely in your browser: upload, enter width and height, click Resize, and compare the result against the original before downloading.

The width and height fields start at the image's real dimensions, which makes proportional resizing straightforward arithmetic: to halve a 3000×2000 photo, enter 1500×1000. The fields are independent — there is no automatic aspect-ratio lock — which cuts both ways: you can hit any exact target a platform demands, but entering a shape the original doesn't have will stretch or squash the picture. When the target shape genuinely differs from the source (a square avatar from a rectangular photo), crop to the new shape first in the Quick Image Editor, then resize.

One direction of resizing is free and the other is not: shrinking discards pixels and looks clean, while enlarging invents pixels the camera never captured and comes out soft — always start from the largest original you have. Resizing is also the single biggest lever on file weight (halving both dimensions removes 75% of the pixels), which is why resize-then-compress — finishing in the Image Compressor — is the standard web-image workflow.

The uploaded file is decoded into an image, drawn onto a canvas sized to your target width and height, and re-encoded in the source's format. Downscaling merges neighbouring pixels (which looks clean); upscaling interpolates new pixels between existing ones (which reads as softness — the information simply is not there). Because the canvas is set to exactly the numbers you typed, the output shape follows your input literally: matching proportions preserve the picture, mismatched ones stretch it. The preview renders the actual output blob, so what you compare is what you download.

The width and height fields are independent — there is no aspect-ratio lock, percentage mode, or batch processing, so proportional resizing means scaling both numbers yourself and multiple images mean multiple passes. Enlarging beyond the source size produces soft results by the nature of interpolation, not as a defect of the tool. Resizing cannot change an image's shape without distortion; cropping (Quick Image Editor) is the right tool for shape changes.

The file is loaded via an object URL into an Image element and drawn with drawImage onto a canvas sized to the entered width and height — a single-step scale using the browser's built-in interpolation. Output is produced by canvas.toBlob in the source's MIME type and previewed from the resulting object URL. Processing is on-demand (button-triggered) and entirely client-side.

Anyone who has been told "the image must be exactly W×H pixels" — form fillers, marketplace sellers, print customers — and site owners scaling photos to their display size before compressing. Users who want guided platform presets should use the Social Media Image Resizer; this tool is the precise, any-dimensions version.