Reduce JPG, PNG and WebP file sizes privately in your browser.
Images are processed entirely on your device — never uploaded.
How do you compress an image?
The image is drawn onto an off-screen canvas and re-encoded at your chosen quality; lower quality and smaller dimensions both reduce file size. PNG output is lossless, so use JPEG or WebP for the biggest savings. For example, a 4 MB JPEG re-encoded at 70% quality and resized to 1600 px wide commonly drops to well under 1 MB with little visible difference.
Understanding your result
The result card shows the original size, the new size and the percentage saved. Because everything is local, even large or sensitive photos stay private.
Formula and method
The image is drawn onto an off-screen canvas and re-encoded at your chosen quality. Lower quality and smaller dimensions both reduce file size. PNG output is lossless, so use JPEG or WebP for the biggest savings.
Assumptions and limitations
Compression uses your browser's canvas engine, so results depend on your device and the source image; PNG output stays lossless and saves little, making JPEG or WebP better for real reduction. Lowering quality too far or resizing smaller loses detail. Metadata may be stripped during re-encoding, and processing very large images depends on available memory. Nothing is uploaded.
Worked example
A 4 MB JPEG photo re-encoded at 70% quality and resized to 1600 px wide commonly drops to well under 1 MB with little visible difference.
How to use this tool
- Choose an image from your device.
- Set the quality, output format and optional max width.
- Press Compress, then download the smaller file.
Common mistakes to avoid
- Expecting PNG to shrink dramatically — it is lossless; choose JPEG or WebP for photos.
- Setting quality so low that visible artefacts appear.
About the Image Compressor
The Image Compressor reduces photo file sizes using your browser’s built-in canvas engine. Adjust quality, convert formats and optionally resize — all without uploading your images anywhere.
Who should use this tool
Bloggers, developers and anyone who needs smaller image files for faster pages or email attachments. If you have JPG, PNG or WebP images that are too large and want to reduce them, convert formats or resize, this re-encodes them entirely in your browser so even sensitive photos never leave your device.
Benefits
- Compresses JPG, PNG and WebP entirely in your browser
- Shows original size, new size and percentage saved
- Lets you adjust quality, convert format and resize
- Keeps even sensitive photos private with no upload
Practical use cases
- Shrinking photos to speed up a web page
- Reducing an image to fit an upload limit
- Converting a PNG to WebP for smaller files
- Resizing a large photo before emailing it
Frequently asked questions
Are my images uploaded?
No. Compression happens entirely in your browser using the canvas API. Nothing is sent to a server.
Which format should I pick?
WebP usually gives the best size for photos, JPEG is the most compatible, and PNG preserves transparency losslessly.
Why does compressing a PNG barely reduce its size?
PNG uses lossless compression, so re-encoding preserves every pixel and offers little room to shrink photographs. For real savings on photos, convert to JPEG or WebP, which discard imperceptible detail to reach much smaller files. Keep PNG only when you need lossless quality or transparency.
Will compressing reduce the visible quality of my image?
At moderate settings the difference is usually hard to notice, especially on photographs. Pushing quality very low or resizing to small dimensions will start to show artefacts or softness. Use the size figures and preview to find a balance between file size and how the image looks.