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Compress image to 500 KB

Get a photo under 500 KB at the best quality that fits, checked before you download. Free, with no upload and no sign-up.

Files stay on your device

Drop images to get them under 500 KB

Add one or as many as you like. Each is compressed on your device until it fits, so nothing is uploaded.

PNG, JPG, WebP, HEIC, AVIF, SVG, BMP, and GIF. As many as you like, or a whole folder.

Compress to
Each picture is saved at the highest quality that fits, then drawn smaller when quality alone can't get it there.

A picture already under it is kept as it is.

A JPG, PNG, or WebP stays what it is. Other pictures become JPG, or PNG when they're transparent.

Transparent areas in a JPG

Off, the quality goes as low as it takes instead, and some sizes can't be reached.

How to compress an image to 500 KB

Add your photos, and each is saved at the highest quality that stays under 500 KB, then drawn a little smaller only when quality alone can't get it there. Websites, email, and chat apps often ask for pictures under 500 KB. Everything happens in your browser, so your pictures are never uploaded.

  1. Step 1

    Choose your photos
    Add one picture, several, or a folder.

  2. Step 2

    Check the size
    Keep 500 KB or type another. Tick Not smaller than if the form sets one.

  3. Step 3

    Download
    Save each photo, or all of them in a ZIP, once its size is checked.

What to expect

Supported inputs
JPG, PNG, WebP, HEIC, AVIF, BMP, GIF, and SVG, one or many at once. HEIC opens in Chrome, Edge, and Safari on most computers, but not in Firefox.
What happens
A JPG, PNG, or WebP stays in its format unless you choose another; HEIC and other photos become JPG. JPG and WebP are saved at lower and lower quality until they fit, never below a quality that still looks like a photo, and only then is the picture drawn smaller. A PNG is cut to 256 colors with dithering before it's drawn smaller. Every file is read back and measured before you see it. If a form also sets a smallest size, tick Not smaller than and type it.
Limits
A picture already under 500 KB is kept as it is. The smaller the size, the smaller a photo comes out, but at a size a form's photo box shows well. Very large pictures can be more than a phone's browser can hold.

Private by design

Your images stay on your device

Mastershot processes your file locally in this browser. It does not need to be uploaded to a server, and you do not need an account to use the tool.

  • No upload
  • No signup
  • No watermark

Questions

Add it here. It's saved at the highest quality under 500 KB, and the finished size is shown on its row before you download it. Nothing is uploaded.

Yes. Tick Not smaller than and type the size, for forms that want a file between two sizes. Quality goes up to reach it, and the picture is drawn larger if it has to be.

A JPG, PNG, or WebP stays what it is. Choose JPG under Save as when a form asks for one; it's also the format that gets a photo smallest.

Very little for most photos. A JPG at 500 KB keeps the full picture of a phone photo at a quality that's hard to tell from the original; only very large or very detailed pictures are drawn smaller.

Yes. Add as many as you like, and download them one by one or all together in a ZIP.

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