Image Tools

Resize an Image from the Original Pixels

Resize a browser-readable JPG, PNG, WebP, or GIF bitmap to explicit pixel dimensions, with an aspect-ratio lock and verified PNG, JPEG, or WebP output.

Select one image, set the delivery dimensions, generate from the selected source, and inspect the returned MIME type before downloading. The AIGClub handler performs this operation with browser image and Canvas APIs.

Maintained by AIGClub Team

Browser-local image processing

Image Resizer

● Processed by this browser

Choose an image

Width (pixels)

Height (pixels)

Keep original aspect ratio

Output format

JPEG / WebP quality

Preview

Choose a JPG, PNG, WebP, or GIF that this browser can decode. Animation becomes the single static bitmap exposed by the browser. Source and output width and height must each be 1–16384 pixels.

How to use

Finish in three steps

01
Choose a file this browser can decode and confirm that source width and height are each between 1 and 16384 pixels.
02
Enter a target width or height. Keep the ratio lock for proportional output, or unlock it only when distortion is intentional.
03
Select PNG, JPEG, or WebP, generate once, then verify the preview, MIME type, pixel dimensions, transparency, and file size before download.

Worked example: 4000 × 3000 to 1200 × 900

Choose the 4000 × 3000 source, leave the ratio lock enabled, and enter width 1200. The derived height is 900. Confirm that the output summary says 1200 × 900 and that important text or faces still look sharp at the intended display size.

Dimension and repeat-operation boundaries

Source and output width and height must each stay within 1–16384 pixels. The derived side is checked after ratio calculation, so a setting that would produce 32768 pixels fails. Changing a parameter invalidates the old download; generating again still uses the original selected bitmap.

Encoding is a separate decision

JPEG and WebP quality values are browser encoding hints, not target byte sizes. PNG ignores that control. The tool checks the actual Blob MIME before naming the file; decode support, encoder results, transparency, color handling, and device memory remain browser-dependent.

What browser-local means here

The AIGClub resize handler has no application upload request and uses an object URL, Image, Canvas, Blob, and a download link. This statement does not claim that the whole page makes no network requests or that extensions, device software, metadata, EXIF, or ICC behavior are controlled.

FAQ

About this tool

Why did a ratio-locked dimension fail?

The requested side may be valid while the calculated side exceeds 16384 pixels. Reduce the controlling side and generate again.

Will a second resize use the first exported preview?

No. While the same source remains selected, each generation redraws that original static bitmap. Changing controls also disables the earlier download.

Can I predict the exact output bytes from the quality value?

No. Canvas quality is a hint to the browser encoder; content and browser implementation affect the final byte count.

What should I verify for a transparent source?

Check the downloaded file in its destination. JPEG cannot represent alpha, while PNG or WebP handling still needs visual verification.