Resize Image

This tool gives you three ways to set output dimensions. Type an exact width and height in pixels, tap a percentage button (25%, 50%, 75%, 150%, or 200%) to scale relative to the original, or pick a social preset that fills both fields for you: Instagram square (1080×1080), Instagram story (1080×1920), YouTube thumbnail (1280×720), or LinkedIn post (1200×627).

The lock toggle next to the dimension fields keeps proportions intact. With it on, editing the width recalculates the height automatically (and vice versa) so the image never stretches. The percentage presets always preserve the original ratio. Choosing a social preset intentionally turns the lock off, because those target sizes have fixed aspect ratios that may differ from your source image. With the lock off, the output is exactly the width and height in the fields: if that shape differs from your photo, the edges are trimmed evenly so the image fills it without stretching.

Loading a file shows its pixel dimensions and size above the controls.

Export as JPG, PNG or WebP. For JPG and WebP, a quality slider from 60 to 95 trades file size against fidelity; PNG is lossless and ignores it, keeping sharp edges and transparency. For a small web file, WebP at mid-range quality is usually leanest.

The Prevent upscale checkbox is on by default. While enabled, requesting dimensions larger than the original will not stretch the image past its native size, which avoids the soft, blocky look of fake enlargement. Turn it off only when you deliberately need a larger canvas and accept that upscaling beyond the original dimensions reduces quality.

After processing, the output size in pixels is shown with any notes from the resize step (such as trimmed edges or a prevented upscale), and you can compare the original and output file sizes before saving.

Resizing happens in your browser on a local canvas, so on this site the file is not uploaded and speed depends on your device. Dimensions beyond the browser's canvas limit are rejected rather than failing silently.

Two format cases are worth knowing in advance. Animated GIFs are resized using the first frame only, so the result is a single still image, not an animation. SVGs are rasterized on export: a vector file comes out as a fixed-resolution PNG, which is fine for a one-off bitmap but loses the infinite scalability of the original vector.

If a file will not process, try another source format or a smaller target, and keep your original: shrinking discards pixels for good.