Can this tool both resize dimensions and reduce MB size?

Yes. You can change width/height and also apply compression settings (format and quality) in one step. Reducing dimensions and using JPEG/WebP usually gives the largest file-size reduction compared to resizing alone.

What is the best output format for smaller files?

For most marketing images, WebP or JPEG gives the best size reduction. JPEG is widely compatible and usually smallest for photos. WebP can be even smaller with similar quality. PNG is best for transparency but usually produces larger files.

How should I choose image quality?

A quality range around 75-85 is a strong default for web use. Lower values reduce file size more but can introduce visible artifacts. Start around 82, compare visual quality, then lower it gradually if you need a smaller file.

What does keep aspect ratio do?

When enabled, the tool preserves the original width-to-height ratio so images do not look stretched. It scales to fit inside your target width and height box. Disable it only when you intentionally need exact dimensions even if the image is distorted.

Should I allow upscaling?

Usually no. Upscaling increases dimensions but does not add real detail and can make files larger. Keep upscaling off unless a platform requires a minimum size and you accept the quality tradeoff.

Is image processing done locally or uploaded?

Processing is done in your browser on your device. Files are not sent to a backend for resizing or compression in this tool flow, which helps with privacy and avoids server-side processing costs.

Free tools

Free Image Resizer & Compressor

Resize width and height, choose output format and quality, and reduce image size in MB without uploading to a server.

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Tool 01

Image Resizer & Compressor

Reduce image file size and resize width and height in one flow. Control format, quality, and aspect ratio before exporting.

Upload image and set output rules

Reduce MB size and resize width/height in one step.

IMG

Choose an image file

JPEG, PNG, WebP, AVIF, GIF up to 40 MB.

Resize preset

Width

Height

Output format

Quality: 82

Lower quality means smaller files.

Keep aspect ratioAllow upscaling

Optimized output

Preview and download your compressed resized image.

Upload an image and run optimization to generate output.

How it works

Image Resizer & Compressor: methodology and worked example

How this tool computes its result

Accepts image file upload in the browser, reads dimensions via Image element onload, then resizes using canvas drawImage with computed scale factor. Scale is derived as min(targetWidth / originalWidth, targetHeight / originalHeight, 1) to maintain aspect ratio and prevent upscaling. Canvas output is encoded to WebP format via canvas.toBlob() with a quality parameter (1-100, default 80%). Output size, dimensions, and compression reduction percentage are reported. Resized image is displayed in a preview area and can be downloaded.

Worked example

Upload a 1920x1080 JPEG (500 KB). Set max width 800, max height 600, quality 80%. Scale = min(800/1920, 600/1080, 1) = min(0.417, 0.556, 1) = 0.417. Output dimensions are 1920x0.417 = 800, 1080x0.417 = 450. WebP encoding at quality 80 produces output of ~80 KB, a -84% reduction. Preview shows the resized 800x450 image.

When not to use this tool

This tool resizes in the browser without server processing - it does not batch-resize multiple images, does not apply filters or edits beyond scaling, and the WebP output quality cannot match lossless formats like PNG if your original image is PNG and you care about pixel-perfect quality.

Common mistakes

- Leaving max width and height blank and expecting no resizing - if both are blank, the tool uses original dimensions as the target and applies the quality setting only, potentially reducing quality with no size change depending on the format.
- Uploading a very large file (>10 MB) and timing out - there is no explicit upload size limit in the UI, but browser canvas performance may degrade with huge images; resize to a reasonable size first.
- Comparing output size between JPEG and WebP and assuming WebP is always smaller - WebP typically compresses better, but quality setting heavily influences the final size; JPEG at quality 90 may beat WebP at quality 50.

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