Reduce image file sizes dramatically while preserving visual fidelity — right in your browser. No sign-up, no uploads, and you stay in control of the quality-versus-size tradeoff.
Last updated: July 14, 2026
An image compressor reduces a picture's file size without significantly changing how it looks. It does this by re-encoding the pixel data with fewer bits — smoothing out detail the eye barely notices, simplifying color transitions, and stripping redundant information the format doesn't strictly need to keep. Push the compression too far and you'll start to see it: blocky patches, faint halos around edges, or "mushy" areas that used to have texture. Keep it in a reasonable range and most people can't tell the difference from the original at all.
This tool hands you that dial directly, instead of applying a single fixed setting behind the scenes. Slide it toward 90-100% and you're keeping almost everything, with a modest size reduction. Slide it down toward 30-40% and you're trading a fair bit of fine detail for a much smaller file — useful for thumbnails, previews, or anywhere file size matters more than pixel-perfect accuracy.
Everything runs client-side using your browser's own Canvas API. There's no upload step and no copy of your photo sitting on a server after you close the tab.
Compressing an image with this tool takes three steps and usually finishes in under a second:
When you click compress, your image is drawn onto a hidden <canvas> element at its original size, and the browser then calls canvas.toDataURL('image/jpeg', quality) to re-encode it at the quality level you picked. That single number is what controls how aggressively the JPEG encoder throws away detail — it's the same mechanism most photo editors expose as a "save quality" slider.
Images are usually the heaviest assets on a webpage, in a slide deck, or in an email attachment. A single high-resolution photo can run several megabytes, and that adds up fast — slower page loads, more storage used, and attachments that bounce off strict email size limits. Compression tackles all three at once, often cutting a file down by 50-80% while still looking essentially the same at normal viewing sizes.
This matters more than it might seem for websites specifically. Page load speed feeds directly into Core Web Vitals, which search engines factor into ranking, and slow pages tend to lose visitors before they even see the content. Trimming image weight before you upload anything to a site is one of the highest-leverage things you can do for load times without touching a line of code.
| Quality range | What you get | Good for |
|---|---|---|
| 90–100% | Minimal size savings, near-original quality | Print, archival copies, close-up detail |
| 70–89% | Noticeably smaller, quality loss hard to spot | Most website and blog images |
| 40–69% | Significant size drop, mild softness visible up close | Social media posts, email attachments |
| Below 40% | Maximum compression, visible artifacts | Thumbnails, placeholders, non-critical previews |
If you're aiming for a specific format afterward rather than just a smaller JPEG, our JPEG to PNG and PNG to JPEG converters handle the format side of things.
Once your images are compressed and ready, our Image to PDF tool can bundle a batch of them into a single document, and Background Remover is there if you need to strip the background out of a product photo before compressing it.
You can drop in JPG, PNG, WEBP, BMP or GIF files and the tool will load a preview and let you compress it.
Worth being upfront about: the compressed file this tool produces is always saved as a JPEG, regardless of what format you uploaded. That's fine for photos, but it means any transparent areas in a PNG source will get filled in with a solid color rather than staying see-through. If your image relies on transparency — a logo or icon, say — compress a copy that already has its background flattened, or use our Background Remover and PNG to JPEG tools with that in mind.
The tool relies on the standard Canvas API and works in current versions of Chrome, Firefox, Safari and Edge, on both desktop and mobile. Very large photos can take a little longer to process on older devices simply because there's more pixel data to redraw.
Click the file input or drag and drop your image directly onto the page.
Use the slider to set your desired compression level — higher for smaller files, lower for better quality.
Click Compress and download your optimized image instantly — no watermarks, no sign-up.
No. The compression runs inside your own browser tab using the Canvas API. Your file is read locally and re-encoded on your device — it's never transmitted anywhere.
You can upload JPG, PNG, WEBP, BMP and most other common image formats. The compressed output this tool produces is always saved as a JPEG file.
No. Compression here only changes how the pixel data is encoded, not the image's dimensions. Your photo comes out at the exact same width and height it went in at.
Somewhere between 70% and 85% is a reasonable starting point for most web images — it keeps the photo looking clean while cutting the file size noticeably. Drop lower if the image is just a thumbnail or background element.
There's no artificial cap built into the tool. Browsers can typically handle files well into the tens of megabytes, though very large images may take a moment longer on older devices.
Almost always, but not guaranteed. An image that's already heavily compressed, or very small and simple, may not shrink much further, and in rare cases a low-quality source can end up close to the same size.
No installs, no browser extensions, no account. Upload your image, adjust the slider, and download the result.
It's free, full stop — no watermark on the download, no daily quota, no premium tier hiding behind a paywall. More questions? Our full FAQ page covers the rest of the toolkit.