Reduce image file size without visible quality loss

A photo thousands of pixels wide does not need to remain that large for a thumbnail, email, or narrow content column. Reducing width and height removes pixels directly and often delivers the cleanest saving.

Keep aspect ratio enabled. If an image is displayed at 800 CSS pixels on a dense screen, a 1600-pixel source may make sense. Exporting 4000 pixels usually adds nothing in that slot.

A photograph often works well as lossy JPG, WebP, or AVIF. A screenshot, raster logo, or interface with flat colors may survive better as PNG or lossless WebP.

Converting a photographic PNG to WebP can save substantial space. Converting a transparent logo to JPG adds a background and can create artifacts around edges.

The quality control affects supported lossy outputs. Browser Canvas encoding accepts a quality value for JPEG and WebP, but the exact result depends on the browser implementation.

Start at 85, inspect the file, then try 78 or 72 when more reduction is needed. Watch edges, gradients, faces, noise, and small text. Return to the last acceptable setting.

Quality generally controls how much visual information a lossy encoder may discard. Compression effort asks the encoder to spend more work finding a compact representation.

Higher effort can take longer without visibly changing the image. It does not guarantee a large saving for every format. Measure the result.

Compare source and output at 100%, then at the intended display size. A defect hidden in a thumbnail may be obvious in print, while a difference visible at 400% may not matter for email.

Keep the original and give the optimized copy a distinct name. When a platform imposes a strict limit, reduce dimensions and quality progressively instead of overwriting the source.