Choosing the right format and dimensions can reduce file size while keeping an image suitable for its purpose. Use this guide as a starting point, then compare the result with the original.
JPEG, PNG or WebP: which format should you choose?
JPEG for photographs
JPEG is widely supported and often works well for photographs without transparency. Compression can discard detail: lower quality tends to make files smaller, but may also cause blocks, halos or loss of texture.
PNG for transparency and graphics
PNG preserves transparency and uses lossless compression. It is a good choice for logos, icons, screenshots and images with transparent areas. For photographs, the file may be larger than JPEG or WebP.
WebP as a compact alternative
WebP supports transparency and can produce smaller files, though results depend on the image and settings. Before sharing, check that the site, app or recipient accepts WebP.
No format is always the smallest. Convert a copy, compare file sizes, and zoom in to check detail, text and transparency.
Open the image converter →How to compress without losing more quality than necessary
Start with the dimensions
If an image has far more pixels than its display area needs, reduce its width and height first. Fewer pixels usually mean less data to store.
Try 80% first for JPEG or WebP
MediaTidy’s quality control is an encoding setting, not a guaranteed visual quality score. Compare the result with the original; raise the setting if you notice loss. If it looks clear, try lowering it slightly.
Check the image at its intended size
Look at faces, edges, small text, gradients and detailed areas. Compare at the same zoom level and keep the original file.
Keep PNG in mind
The quality setting does not apply to PNG in this tool. To make a PNG smaller, reducing its dimensions may help; WebP is another option if the destination supports transparency in that format.
A conversion can make a file larger. Image content, noise, colors, dimensions and the source format all affect the result.
Open the image compressor →How to choose width and height
Think about the final use
A small avatar does not need the same dimensions as a photograph that will be enlarged or printed. Check the requirements of the site or service where you plan to use it.
Keep the aspect ratio
Turn on “Keep proportions” to prevent people and objects from looking stretched. When you change one dimension, the other is calculated to preserve the original shape.
Reducing is different from enlarging
Reducing dimensions can make a file smaller. Enlarging cannot restore detail that was absent from the original and may create a larger file without improving sharpness.
The tools accept output dimensions from 1 to 12,000 pixels on each side, up to 24 megapixels in total.
Open the image resizer →MediaTidy processes images in your device’s browser. Keep a copy of the original and check the downloaded file before publishing or sending it.