Compress images and see exactly what it costs you
Most compressors give you a slider and a promise. This one shows the before and after size on every file, so you can pick the point where the saving stops being worth it.
- No upload
- No sign-up
- No watermark
- Unlimited files
- 100% local processingRuns in your browser. Files never leave your device.
- No uploads, no queueInstant results, even on large batches.
- No watermarksClean output, yours to use anywhere.
- Blazing fastModern browsers and the Canvas API make it quick.
How to compress an image
Drop in the images you want to compress.
Choose an output format. WebP compresses hardest; keep the original format if you need to.
Set the quality, starting around 75 to 80 for web use.
Convert, read the saving reported on each file, and adjust the quality if you want more or less.
Why it runs in your browser
- FastRuns locally at the speed of your own device.
- 100% privateYour files never leave your device. Ever.
- No limitsNo file size caps and no daily quota.
- LighterNo round trip means less data moved for the same result.
What you should know
Image weight is the largest single contributor to page size on most websites, and it is the easiest to fix. Before reaching for a caching plugin or a CDN, it is worth checking what the images actually weigh, because a page carrying four megabytes of unoptimised photography will be slow no matter what sits in front of it.
Compression is a trade, and the trade is not linear. Going from quality 100 to 85 usually removes half the file size and no visible quality. Going from 85 to 70 removes another sizeable chunk and starts to show on flat gradients and skin tones. Below about 60, most images visibly degrade. The useful range for web delivery is 75 to 85, and the fastest way to find your number is to convert once, look at the result, and adjust.
Format is part of compression, not separate from it. Re-saving a PNG photograph as a smaller PNG achieves very little, because PNG is lossless by design. Converting that same photograph to WebP at quality 80 will often cut it by three quarters. If a file is not shrinking as much as you expect, the format is usually the reason.
Questions people ask
How much can I compress an image without it looking worse?
For photographs, quality 80 to 85 in WebP or JPEG is visually indistinguishable from the original at normal viewing size, and typically 60 to 80 percent smaller than an unoptimised export.
Does compressing reduce the dimensions of my image?
Not by itself. Compression reduces file size at the same pixel dimensions. If you also want fewer pixels, set a target width, which usually saves more than compression alone.
Why is my PNG barely getting smaller?
PNG is lossless, so the quality control has little to work with. Converting the file to WebP instead will usually produce a dramatically smaller result, with transparency preserved.
Can I compress images without uploading them?
That is exactly what this does. The work happens in your browser, so no file is transmitted anywhere and nothing is retained after you close the tab.
Images are one line item
Compressing them is the cheap half of page speed. If the rest of the site is still slow, or the traffic is not converting once it arrives, that is the part we actually get paid for.
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