Compress Image
Shrink image file size with a quality slider and honest before/after numbers.
- Runs in your browser
- Nothing is uploaded
- No account
- No watermark
Drop images to compress
or · paste with ⌘/Ctrl + V
About
What Compress Image does
Shrink JPG, PNG and WebP images with a quality slider and honest before/after numbers — you can see exactly what each setting costs before you commit to it. Auto keeps a JPG a JPG and turns a PNG into WebP, or you can choose the format yourself.
Everything happens on your own machine: the file is decoded, processed and re-encoded by your browser, and never leaves your device. There is no upload, no queue and no account.
Why this one
Why use Compress Image here
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Nothing is uploaded
Images are compressed by your own browser, so no copy of them sits on a server waiting to be deleted.
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Honest numbers
Every file shows its size before and after. One that comes out larger says so, and one that cannot be made smaller in its own format is handed back untouched.
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Compressed once
Moving the slider compresses again from your original, never from the last result, so quality is only ever lost once.
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No caps
No file-size cap, no daily limit and no sign-up. Compress a whole batch at once and download it as one ZIP.
How it works
How to use Compress Image
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Drop in the images you want smaller, click to choose them, or paste one.
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Each one is compressed straight away, and its size before and after is shown on it.
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Leave the format on Auto, or choose WebP, JPEG or PNG, and move the quality slider for a different balance of size and quality.
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Download one image, or the whole batch as a ZIP.
Questions
Frequently asked
How do I compress an image?
Drop it here. It is compressed straight away, with its size before and after shown, and you can download it or move the quality slider first. Nothing is uploaded.
How much smaller will my images get?
It depends heavily on the source. Photographs typically compress a great deal; images that are already well-optimised, or that contain flat colour and sharp edges, compress much less. Rather than promise a number, the tool shows you the actual before and after size for your files.
Does compressing repeatedly degrade the image?
It would, which is why this tool does not do it. Moving the slider re-compresses from the original file you dropped in, not from the previous result, so you only ever apply one round of lossy encoding.
What is the difference between compressing and resizing?
Compressing keeps the same pixel dimensions and stores them more efficiently. Resizing reduces the pixel dimensions themselves. For large photos, resizing first usually saves far more than compression alone — the two are often best used together.
What does Auto do?
It keeps a JPG a JPG and a WebP a WebP, and turns a PNG into WebP, which keeps transparency at a fraction of the size. GIF, BMP and AVIF come out as JPG. Choose a format yourself if you need a particular one.
Can I compress a PNG and keep it a PNG?
Yes: choose PNG. It is lossless, so it saves less than WebP or JPEG, and if it cannot make the file smaller you get the original back rather than a bigger copy.
What quality should I use?
The default, 75, suits most photos on the web: the saving is large and the difference is hard to see. Go higher for photos you will print or edit again, and lower for thumbnails.
How do I get an image under 100 KB?
Lower the quality and watch the size shown on the file until it is under the limit. If it is still too big, make it smaller in pixels with Resize Image first, which saves far more than compression alone.
Are my images uploaded?
No. They are processed inside this page, on your device, and saved straight back to it. Nothing is sent to a server, so there is no copy anywhere else to delete.
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