Image Compressor
Compress and optimize PNG, JPG, and WEBP images instantly. Runs entirely in your browser — nothing is uploaded to any server.
Drag & drop images here, or click to browse
Accepts PNG, JPG, WEBP — multiple files supported
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Browse All Tools →How Does Image Compression Work?
Image compression reduces file size by eliminating redundant data or reducing precision. Lossy formats like JPEG and WEBP discard information the human eye is less sensitive to, allowing significant size reductions with minimal visible quality loss. Lossless formats like PNG reduce size through algorithms that preserve every pixel exactly.
How This Tool Works
This tool uses the browser's built-in Canvas API for all compression. Your image is drawn onto an HTMLCanvasElement, then exported using canvas.toBlob() with your chosen format and quality settings. For JPEG and WEBP, the quality parameter (0 to 1) controls the compression level. PNG output is always lossless. Resizing is handled by setting the canvas dimensions before drawing the image.
Privacy & Security
All processing happens entirely in your browser. Your images are never uploaded to any server. The compressed images are generated using local Canvas APIs, making this tool safe for sensitive or proprietary images.
When to Use Each Format
JPEG is ideal for photographs and complex images with many colors. It offers the best compression-to-quality ratio for photos. PNG is best for images requiring transparency or when lossless quality is needed (logos, icons, screenshots). WEBP offers superior compression for both lossy and lossless images and is supported by all modern browsers.
Frequently Asked Questions
Is my data safe?
Yes. All compression happens entirely in your browser using the Canvas API. No images are ever sent to a server. You can verify this by disconnecting from the internet and using the tool offline.
Why did my PNG file get larger?
PNG is a lossless format, so the quality slider has no effect on PNG output. If you convert a highly-optimized PNG to PNG via the Canvas API, the output may actually be larger because the browser's encoder isn't as aggressive. For smaller files, try JPEG or WEBP output instead.
What quality setting should I use?
For most photos, a quality of 70–85 provides an excellent balance between file size and visual quality. For web thumbnails, 60–70 is often sufficient. For high-quality prints or portfolio images, use 85–95.
Can I compress multiple images at once?
Yes. Upload as many images as you like by dragging them all into the drop zone or selecting multiple files. Then click "Compress All Images" to process them all with the same settings.