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Convertto

Image Compressor — Shrink to Any Target Size or Dimensions

Drop an image, see its current size and dimensions auto-detected, then set your targets and compress.

Drop an image and the tool auto-detects its width, height and file size. Edit the target width, height or file size to compress — the tool binary-searches for the best quality to hit your KB goal. Everything runs in your browser.

Runs in your browser
Auto-detect
Fills width, height and file size from the image on drop
Target size
Auto-adjusts quality in up to 8 passes to hit your KB goal
Batch
Multiple images in one go
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

How does it know what quality to use?

If the result at your chosen quality is already under the target file size, it keeps that quality. Otherwise it binary-searches downward — trying progressively lower quality levels — until it finds the highest one that stays at or below your target KB.

What quality setting should I use?

For photographs on the web, 70–80 % is usually indistinguishable from the original at roughly a third of the size. Screenshots and graphics with sharp edges hold up better in PNG or at higher WebP quality.

Why did my PNG get bigger?

Re-encoding an already-optimised PNG as PNG can add bytes. For photographs, switch the output format to WebP or JPG — PNG is a lossless format and cannot compete on size for photographic content.

Can I compress an image to exactly 100 KB?

Set the target file size to 100. The tool will find the highest quality that keeps the file at or below 100 KB. If the original is already smaller, no change is needed.

How to use the image compressor

  1. 1Select your images — the file stays on your device and is never uploaded.
  2. 2Set the target width.
  3. 3Set the target height.
  4. 4Set the target file size.
  5. 5Set the quality.
  6. 6Choose the output format.
  7. 7Pick the background.
  8. 8Press Run, then download the result when it is ready.

Embed this tool

Put the working image compressor on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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