Image Compressor
Shrink JPG, PNG and WebP files right in your browser — your images are never uploaded anywhere.
🔒 Your files never leave your device
This free image compressor reduces file size without wrecking your photos. Everything runs locally in your browser using your device's own processing power, so the image never travels to a server. That matters when you're compressing ID scans, family photos or client work: nothing to upload means nothing to leak.
Drag a picture in, move the quality slider, and watch the before/after file sizes update live. You decide the trade-off between size and sharpness instead of trusting a website's hidden default. Most photos can lose 60–80% of their weight before you notice any difference on screen.
Smaller images mean faster websites, emails that actually send, and forms that stop rejecting your upload. Compress once here and skip the 'file too large' error for good.
How to compress an image
- Drop your image onto the upload area, or click to browse for it.
- Move the quality slider to set how much compression you want.
- Check the live before/after sizes to see exactly how much you're saving.
- Preview the result to make sure it still looks sharp enough.
- Click Download to save the compressed image to your device.
Picking the right quality level
For photos going on the web or into email, a quality setting around 70–80% is usually invisible to the eye and cuts the file dramatically. For images with sharp text or fine line art, stay higher, because heavy compression creates fuzzy halos around edges.
If a form demands a hard limit, say 200 KB for a passport photo upload, lower the slider gradually and watch the output size until you slip under the cap. The live readout means no guessing and no repeated re-exports.
What the compressor actually changes
Compression re-encodes your image so the same picture is stored in fewer bytes. For JPG and WebP that means discarding visual information the eye barely registers — subtle color shifts and very fine, high-frequency detail — while keeping the shapes and tones you genuinely notice. The quality slider controls how aggressive that trade is.
PNG behaves differently because it is lossless: the tool can't throw detail away without changing the format. Instead it shrinks a PNG by storing the pixels more efficiently and stripping unneeded metadata. That's why the same photo saved as PNG shrinks far less than as JPG, and why the slider has a bigger effect on JPG and WebP files.
How compression runs in your browser
When you drop an image in, the tool decodes it onto an HTML Canvas, then re-exports it at your chosen quality using the browser's built-in image encoder. All of that happens in JavaScript on your own device — the same engine that renders every web page — so there is no server round-trip and no waiting in a queue.
Because the work is local, the only real limit is your device's memory and processor. A modern laptop compresses a large photo almost instantly; a budget phone takes a couple of seconds on a 40-megapixel image. Nothing is installed, and nothing keeps running after you close the tab.
Your images never leave your device
Ordinary online compressors upload your file to their servers, process it there, and send it back — which means a copy of your image sat on a machine you don't control, however briefly. For a holiday snap that may not matter; for a payslip, a passport scan or unreleased client work it very much does.
Here the picture is read straight into your browser and never transmitted anywhere. You can confirm it: open your browser's network tab, compress an image, and you'll see no upload. That guarantee holds whether you're on office Wi-Fi or a public hotspot.
JPG, PNG and WebP don't compress the same way
JPG is the workhorse for photographs; its lossy compression is tuned for the smooth gradients of real-world scenes and shrinks them enormously. WebP is a newer format that usually beats JPG at the same quality and can also hold transparency, though a few older programs still won't open it.
PNG is lossless and best for screenshots, logos and anything with crisp text or flat color. You can compress a PNG here, but the savings come from smarter storage rather than discarding detail, so don't expect JPG-sized reductions. If a PNG photo is simply too heavy, converting it to JPG or WebP will shrink it far more.
Fixing common compression problems
If smooth areas like skies show faint stripes (banding) or blocky patches, your quality setting is too low — nudge the slider up until they disappear. Fuzzy halos around text and sharp lines are the same story: text-heavy images need a higher setting than photographs do.
If a PNG barely shrinks, that's expected for a lossless format — convert it to JPG or WebP for a real reduction. And if the output looks identical but the file is only slightly smaller, the original was probably already compressed once; there is little left to remove, and pushing harder only adds artifacts.
Where a smaller file actually helps
Fast-loading web pages are the classic case: oversized images are the most common reason a page feels sluggish, and compressing them improves both the visitor's experience and your search ranking. Email is another — many inboxes reject attachments over 20–25 MB, and a compressed batch slips through easily.
E-commerce and marketplace listings often cap image size or file weight, as do job portals and government forms, so compressing first means the upload succeeds on the first try. On phones, smaller images also save mobile data for whoever you send them to.
Frequently asked questions
Is this image compressor free?
Yes, completely free. There is no account, no watermark and no daily limit. Compress as many images as you need.
Are my images uploaded to a server?
No. Compression happens entirely in your browser on your own device. The image never leaves your computer or phone, which makes this safe for private photos and documents.
How much smaller will my image get?
It depends on the source. Photos straight from a phone camera often shrink by 70% or more at a quality setting of 75. Images that were already compressed will shrink less. The before/after readout shows the exact saving before you download.
Does compression reduce image quality?
Some detail is traded for size, but at moderate settings the difference is invisible at normal viewing sizes. Use the preview to check, and raise the slider if you see artifacts around edges or text.
Which formats can I compress?
JPG, PNG and WebP are all supported. JPG and WebP respond best to the quality slider; PNG savings come mostly from optimizing how the file is stored.
Does it work on my phone?
Yes. It runs in any modern browser on iPhone, Android, Windows and Mac. Large images may take a few seconds longer on older phones since your device does the work.