Image Compressor

Image Compressor re-encodes JPG, PNG, or WebP images in your browser to reduce file size while you control quality and optional output format. It uses canvas-based encoding, shows before-and-after previews, and reports sizes so you can judge the trade-off before downloading.

Files up to 20 MB are supported. Quality can be set from 10% to 100%. You can keep the original format or switch output to JPG, PNG, or WebP when your browser supports encoding that format. Optional maximum width and height resize during compression, with aspect ratio lock available.

1. Upload an image via drag-and-drop or the file picker (JPG, PNG, or WebP within the size limit).
2. Set quality (10–100%), choose output format (keep original or JPG/PNG/WebP), and optionally enter max width and height with aspect lock if you want to cap dimensions while compressing.
3. The tool compresses automatically as settings change. Compare the original and compressed previews and file sizes shown in the UI.
4. Click Download to save the compressed file, or Clear to reset and start with a new image.

Quality mainly affects lossy formats (JPG and WebP). Lower values shrink files more but add visible artifacts in smooth gradients and fine detail. PNG stays lossless relative to the canvas pipeline, so “compression” may barely change size unless dimensions are reduced.

Re-encoding can sometimes increase size if the source was already highly optimized or if you pick a less efficient format. JPEG output paints transparent areas on white. Very large images may be scaled down for browser safety (on the order of 8192 px per side or roughly 40 million pixels total).

• Prepare photos for web forms or CMS uploads with a size ceiling.
• Generate a lighter WebP or JPG copy while keeping a master PNG elsewhere.
• Downscale and compress in one step using max width and height.

• Compare the before/after thumbnail previews and size stats before downloading; compression artifacts can be easy to miss at thumbnail scale, so spot-check important areas after you save.
• If PNG output is still huge, try WebP or JPG with transparency removed, or reduce dimensions.
• When file size goes up after a change, try a lower quality or a different output format.

Images are decoded and re-encoded locally with your browser’s canvas APIs. ToolsArk does not upload your file to a server for compression.

Previews and compressed bytes stay in the browser session until you download or clear. Other tabs or extensions in your browser are outside ToolsArk’s control.

• Input limited to JPG, PNG, and WebP up to 20 MB; BMP, GIF, and TIFF are not accepted here (use Image Converter first if needed).
• Available output formats depend on what your browser can encode; WebP or PNG export may be unavailable on older browsers.
• Does not preserve EXIF metadata, color profiles, or animation.
• Does not batch multiple files in one run.
• Extreme dimensions may be clamped for stability; check the preview dimensions against your targets.