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Image requirement guide

Resize an image to exact pixels

Exact pixels are only useful when the crop behavior is visible. Choose crop, fit with padding, scale down only, or stretch with a clear warning.

Exact pixels need an explicit fit decision

Setting a width and height alone does not tell an editor what to do with a different aspect ratio. Crop to fill removes edges, fit with padding preserves the whole source, scale down only avoids enlargement, and stretch changes the geometry. Aftermath keeps those choices visible beside the validation result.

Use the anchor as a focal-point control

The nine-point anchor determines which part of the source survives a crop or where a fitted image sits inside its canvas. Use the same global anchor for a screenshot sequence, then open a file-only override when one image needs a different focal area.

Questions people ask

Does exact pixel mode stretch images?

Not by default. Fit with padding is the starting behavior, and stretch is a separate option with a prominent warning.

Can I rotate before fitting?

Yes. Rotation, mirroring, crop, padding, and output encoding happen in the local processing sequence.

How to use this tool

Enter the required width and height here when the canvas dimensions—not a named platform preset—define the task. You can crop around a focal point, fit the whole source with padding, scale down without enlargement, or stretch with a warning. Aftermath measures the rendered width and height before download. Exact pixels do not guarantee visual quality, and scale-down mode can intentionally return smaller dimensions rather than padding a small source.

What to choose and what you get

What to choose

  • one supported local image

Result

  • a separate processed image copy or local measurement report

Supported use

  • Exact user-entered width and height with crop, fit, scale-down-only, or stretch behavior selected visibly.
  • Nine-point anchoring, focal placement, rotation, background choice, and JPEG, PNG, or WebP output for verified raster inputs.

Before you start

  • Changing pixel dimensions cannot restore detail missing from a small source or prove that a destination will accept the image.
  • Scale-down-only treats width and height as maxima and therefore does not promise an exact padded canvas.

Supported formats

  • Accepted formats: JPG, PNG, WebP, HEIC, AVIF, GIF, BMP.
  • Output formats: JPG, PNG, WebP.

Browser support and permissions

  • Modern browser with JavaScript, a supported image decoder, and enough memory for the selected image.
  • No camera, microphone, or screen permission is needed.

Choose the right settings

  • Use this page when the required width and height are known but do not match a named preset.
  • Use /image-to-512x512, /signature-resizer, or a social preset when its starter canvas exactly matches the intended asset.
  • Use /custom when pixel dimensions must be combined with an independently specified byte range or other output rules.

Worked example

A banner needs exactly 1600 × 900 pixels and the subject should remain centered without geometric stretching.

Starting facts

  • The source ratio differs slightly from 16:9.
  • The destination requires an exact pixel canvas.

Observed operation: Set 1600 × 900, choose crop or contain explicitly, and adjust the anchor or focal point before processing.

Review the result: Verify the downloaded copy reports exactly 1600 × 900 pixels and inspect the crop, padding and sharpness.

Boundary: Changing pixel dimensions cannot restore source detail or prove that the chosen crop meets an editorial requirement.

What you can do

Set an arbitrary exact output width and height, then choose explicitly how the source fills that pixel canvas.

If it does not work

  • Crop can remove source edges, fit can add background area, and stretch can distort proportions if the chosen method is wrong.
  • An exact canvas can exceed the browser's side or pixel safety limits and be rejected before allocation.
  • Combining exact dimensions with a very small byte maximum can fail because automatic dimension reduction is no longer available.

Things to know

  • Review the result on the intended device before relying on it.

Privacy boundary

The selected image stays in the current browser session and is not sent to an Aftermath processing service. How local processing is verified.

What this tool verifies

Checks the displayed limits and reports or creates a separate processed image copy or local measurement report from one supported local image.

Check before sharing

A local measurement or export does not guarantee acceptance by an external destination.

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