Image Compressor
Compress JPEG, PNG, and WebP images locally in your browser with adjustable quality presets.
Reduce image file sizes (JPEG, PNG, WebP) directly in your browser with adjustable quality levels and strict kilobyte caps. Fast, free, and 100% private.
Drop an image file here to compress
Supports JPEG, PNG, and WebP up to 50MB (or click Load Sample Photo)
1. Quality, Format & Target Size Cap
2. Processing Engine
How do I use Image Compressor?
Drop PNG, JPEG, or WebP images into the dropzone, or click "Load Sample Data".
Adjust the target quality slider (`1%–100%`), max width constraint, and output format (`WebP`, `JPEG`, `PNG`).
Compare original vs compressed byte size and download individual images or a batch ZIP.
What features does Image Compressor offer?
Compress JPEG, PNG, WebP, and BMP images
Adjustable compression quality presets (High, Balanced, Maximum)
Format conversion during compression (JPEG, PNG, WebP)
100% private in-browser local processing — zero data uploads
Web Image Codec Compression Efficiency & Chroma Subsampling
Compares DCT/Wavelet quantization and chroma subsampling (`4:2:0` vs `4:4:4`) across modern browser image encoders.
| Image Format | Compression Algorithm | Alpha Channel | Savings vs Unoptimized PNG/JPG | Core Web Vitals (LCP) Role |
|---|---|---|---|---|
| WebP (Lossy Q=80) | VP8 intra-frame block prediction + entropy | 8-bit Lossy/Lossless Alpha | 60% – 85% smaller than PNG | Recommended universal web format |
| JPEG (MozJPEG / Canvas) | 8×8 DCT quantization + 4:2:0 subsampling | No (Flattens to background) | 40% – 70% at Q=75–82 | Photographs without transparency |
| PNG-24 / PNG-8 | DEFLATE (LZ77 + Huffman) + Palette Quant. | Full 8-bit Alpha | 20% – 65% (with palette reduction) | Sharp UI screenshots & line art |
Frequently Asked Questions about Image Compressor
Why does compressed image file size sometimes increase if I set JPEG quality to `100%`?
Most cameras and web images are originally saved at `Q=80–85`. Re-encoding an existing `Q=80` JPEG at `Q=100` uses a finer quantization matrix that encodes existing compression artifacts as high-frequency detail, inflating byte size with zero visual gain.
What is the optimal quality setting (`Q`) for Google Core Web Vitals Largest Contentful Paint (LCP)?
Google Lighthouse benchmarks use **Quality `80–82`** for JPEG and **`75–80`** for WebP. This sweet spot eliminates roughly 65% of file weight while remaining perceptually indistinguishable (`SSIM > 0.98`) to the human eye.
Does client-side canvas compression strip GPS location and camera EXIF metadata?
Yes. Decoding an image onto an HTML5 `<canvas>` and re-encoding via `toBlob()` writes only raw pixel data, automatically stripping private EXIF GPS coordinates, camera serial numbers, and embedded thumbnails.
What happens to transparent backgrounds when converting PNG to JPEG?
Because the JPEG (`JFIF`) specification only supports 3 channels (`YCbCr`) without an alpha channel, transparent pixels are composited onto a solid background before encoding. Use **WebP** to achieve JPEG-level compression while keeping full transparency.
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