Image Compressor
Reduce image file size without losing quality using browser-side compression.
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Quick Tip
Choose the image you want to compress.
About This Tool
Why use Image Compressor?
Shrink an image by re-encoding it as JPEG at a quality level you choose with a slider, from heavy compression up to near-original. The savings are shown as a percentage against the file you started with, so you can move the slider until the picture still looks right and the number is low enough.
Quality 70, the default, is the setting most people end up at: photographs typically lose 60 to 80 per cent of their file size with no difference that shows at normal viewing size. Push much below 50 and JPEG artefacts start to appear around hard edges and in flat areas of sky. Because the output is JPEG, transparent areas are filled with white first, and the download is named .jpg regardless of what you put in — a JPEG wearing a .png extension is rejected by a surprising number of upload forms.
Key Benefits
Savings shown as you go
The percentage saved against the original is displayed, so you are choosing a real number rather than guessing at a quality level.
Transparency flattened to white
JPEG has no alpha channel, so transparent pixels are filled with white rather than turning black the way a naive conversion does.
Nothing uploaded
The image is compressed by your browser, so personal photos and internal screenshots never reach a server.
How to use Image Compressor
- 1
Choose the image you want to compress.
- 2
Move the quality slider and watch the savings percentage change.
- 3
Compare the preview against the original before committing.
- 4
Download the compressed .jpg when the size and the look are both acceptable.
Best use cases
Get a photo under an upload or attachment size limit.
Cut page weight before publishing images to a website.
Reduce the size of screenshots before attaching them to a ticket.
Free up space in a folder of oversized camera exports.
Image Compressor FAQs
What quality setting should I use?
Start at 70. For photographs that usually removes most of the file size with no visible difference. Below about 50, JPEG artefacts begin to show around edges and in flat areas like sky.
What file do I get back?
Always a JPEG, named .jpg. That is why transparency is flattened to white — JPEG has no alpha channel to store it in.
Can I get the original quality back afterwards?
No. JPEG compression discards detail permanently. Keep your original file if you might need to edit the image again.
Why did my screenshot barely get smaller?
Screenshots and flat graphics compress badly in JPEG and can even grow. Those belong in PNG or WebP, which handle sharp edges and flat colour far better.
Related File Tools
More free file tools that work well alongside image compressor.