Free image converter and optimizer

The converter accepts still PNG, JPEG, WebP, AVIF, HEIC, and HEIF files that your current browser can decode. HEIC and HEIF support varies by browser. If a file does not open, convert it to JPEG or PNG with a compatible device or application first.

WebP, JPEG, and PNG are available. AVIF appears after a feature check confirms that the browser can create a real AVIF through its canvas encoder. A failed check removes AVIF from the format menu and prevents a mislabeled download.

No image file is sent to Design Overflow. The page reads, converts, previews, and packages the files in the browser. Site analytics record events such as a completed conversion with normal page, device, and session context. Those events omit the image and filename.

WebP is a sensible starting point for many web raster images because current major browsers display it and many publishing tools can create it. Test AVIF when this browser offers it and the rest of your publishing stack accepts it. File size and visible quality depend on the source, so compare the outputs instead of relying on a fixed percentage.

It supplies a lossy quality value for JPEG, WebP, and AVIF encoding. It is not a universal visual score, and different encoders or images can produce different results at the same number. PNG uses lossless encoding, so the control is disabled for PNG. Resizing still resamples the pixels.

Yes. The preset options fit the image within a maximum width and height while keeping its aspect ratio, and they do not upscale smaller sources. Custom width and height values form a bounding box; the output fits inside it without stretching.

Bulk mode accepts up to 15 images and can package completed files in one ZIP. Work happens on your device, so large source files and high-resolution batches can use substantial memory and take longer on less powerful hardware.

No. This tool creates individual files. A production implementation may also need multiple widths, srcset and sizes, an appropriate loading strategy, fixed dimensions, caching or CDN rules, descriptive alt text, and performance verification on the deployed page.

The tool produces still images. Do not use it to preserve an animation or assume that the original metadata survives conversion. Keep the source file and inspect the downloaded result when metadata matters.