Great Scott Labs

Image Resizer / Compressor

Resize images by pixels or percent, or shrink them to a target file size. It runs entirely in your browser, so the file never leaves your computer.

Runs on your device Nothing is uploaded · works offline once loaded Open in new tab ↗
One file, and it is the whole program. The download is an .html file that opens in your browser — save it somewhere you’ll find it again and it keeps working with no internet, forever. Download this tool ↓

Two different problems that get confused

"Too big" means one of two things. Either the image has too many pixels — 6000 across when the form wants 1200 — or the file has too many kilobytes, which is a question of compression, not dimensions.

Resizing changes the pixel dimensions. Compressing keeps the dimensions and lowers the quality slightly to shed kilobytes. You can do either, or both, and which one you need depends entirely on which limit you hit.

Hitting an exact file size

When a form says "maximum 2 MB", guessing at a quality slider is maddening. Give this a target size instead and it searches for the quality setting that lands just under, then shows you the result before you commit.

That works on JPG, where quality is a dial. PNG is lossless and has no such dial, so a PNG cannot be pushed to an arbitrary target the same way — and this tool says so rather than quietly failing at it.

Shrinking is safe, enlarging is not

Making an image smaller stays sharp; you are throwing away detail you had. Making it larger cannot invent detail that was never captured, so an upscaled image looks soft no matter which tool does it.

There is also a trap in simply re-saving: a JPG re-encoded at high quality can come out bigger than it went in. This tool passes a file through untouched when there is nothing to gain.

Questions

Common questions

What does this tool do?

It makes images smaller — either smaller in dimensions (fewer pixels) or smaller in file size (fewer kilobytes). Handy for fitting upload limits, speeding up a website, or emailing photos.

How do I resize an image?

Drop an image in, then set a new width and height in pixels or scale it by a percentage. The tool shows the result and the new file size, and you download it.

What's the difference between resizing and compressing?

Resizing changes the dimensions — the actual width and height in pixels. Compressing keeps the dimensions but lowers the file size by reducing quality slightly. You can do either or both.

Can I shrink a photo to a specific file size?

Yes — that's the compress option. Tell it a target file size and it lowers the quality just enough to get under it, which is useful when a form says 'max 2 MB' or similar.

Will resizing blur my image?

Making an image smaller stays sharp. Making it larger than its original size can look soft, because there's no extra detail to add — this tool is best for shrinking, not enlarging.

Is my photo private?

Yes. Everything happens on your own computer in the browser — your photos never leave your machine and nothing is uploaded.

Our own software

Dictate it instead of typing it

Hold a key, say the sentence, and the words land in whatever Windows window you were already in. Runs on your own PC — no account, no upload, nothing to renew.

$79 launch price · $99 regular · buy once
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Our own software

The photo app that finds the picture

Search thirty thousand photos by what is actually in them rather than by filename, and open the formats a browser cannot — HEIC from a phone among them. Same rules as everything here: it runs on your own machine and you buy it once.

In build · tell us where to send the release note
Tell me when it’s ready
All 45 tools, offline, in one app. A signed Windows install with a Start-menu icon and no browser needed. A few dollars, once. The web versions stay free.
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