Reduce image file sizes by up to 80% while maintaining visual quality. Our browser-based compressor uses advanced algorithms to optimize JPEG, PNG, and WebP images for faster web loading and reduced storage.
Drop an image here or click to upload
Supports JPEG, PNG, WebP, and more
Upgrade to compress multiple images at once
Lower quality = smaller file size. 70-80% is recommended for most images.
Images wider than this will be resized proportionally.
Saved Presets is a Supporter feature.
Tool Notes is a Supporter feature.
Drag and drop an image onto the upload area, or click to open the file picker. Enable Batch Mode (Supporter feature) to queue multiple images at once. You can remove individual files from the queue before compressing.
Use the Quality slider (10%–100%) to control the compression level — lower values produce smaller files with more artifacts. Use the Max Width slider (640–4096 px) to automatically downscale images that exceed the chosen dimension. The defaults of 80% quality and 1920 px work well for most web images.
Click 'Compress Images' to start processing. A progress bar shows how many images have been completed when compressing a batch. Compression runs in a background Web Worker so the page stays responsive.
After compression, review each result: a thumbnail preview, original and compressed sizes, and the percentage saved. Download files individually, or click 'Download All' to get every compressed image in a single ZIP file.
When you click Compress, the tool hands each image to the browser-image-compression library running inside a Web Worker. The library decodes the image, optionally resizes it down to your chosen max dimension, re-encodes it at the target quality level, and returns a compressed Blob — all without any network requests. Because processing happens off the main thread, the UI stays responsive even for large batches.
JPEG and WebP use lossy compression: they apply a Discrete Cosine Transform (DCT) to 8x8 pixel blocks, quantize the frequency coefficients, and discard data the human eye is least likely to notice. Lower quality settings increase quantization, producing smaller files but introducing artifacts. PNG uses lossless DEFLATE compression and preserves every pixel exactly. The tool applies the quality slider to lossy formats and optimizes lossless formats within the library's defaults.
The quality slider maps directly to the JPEG/WebP encoder's quality parameter. At 100% almost no data is discarded and files stay large. At 50% aggressive quantization can shrink files by 70%+ but may introduce visible blocking. The sweet spot for most photographs is 70–85%, where file sizes drop significantly while quality remains excellent for web viewing. Graphics with sharp edges or text often benefit from staying above 85%.
If an image's width or height exceeds the Max Width setting, the library proportionally scales it down before compressing. This often provides the biggest file-size savings: a 4000x3000 photo downscaled to 1920 px wide loses little perceptible detail on screen but can drop from 8 MB to under 1 MB. Downscaling is applied before quality compression, so both optimizations stack.
The entire compression pipeline runs in your browser's Web Worker. No image data is sent to any server, and compressed results exist only in memory until you download them. Clearing the tool revokes all in-memory object URLs. This architecture means your images are private by design, not just by policy.
Yes. All compression runs locally in your browser using a Web Worker. Your images are never uploaded to any server. When you clear the tool, all in-memory data is released.
