An upload limit usually measures file bytes, while image dimensions measure pixels. These are related but different: two images with the same dimensions can have very different file sizes. Compression can reduce bytes, but it cannot promise the same savings for every picture. Begin with the original and decide which details the destination actually needs.
Step-by-step guide
- Keep the original image and note the destination size requirement and accepted formats.
- Open Compress Image and check supported inputs, file-size and resolution limits.
- Select the image and choose a compression option offered by the tool.
- Run compression, download the output and compare its size with the source.
- Inspect faces, text, gradients and fine edges at the intended display size before using the smaller copy.
Practical tips and limitations
A photograph intended for a small web card does not necessarily need all the pixels in a camera original, but this guide does not assume the compressor exposes a resize control. Use only controls available on the page. PNG and JPG have different transparency and compression properties; do not change to JPG if transparent edges are required. Repeatedly saving a lossy output can accumulate artifacts, so try alternative settings from the original instead. If the input exceeds the pixel ceiling, prepare a smaller source in your image editor rather than relying on compression to bypass admission limits.
Frequently asked questions
Why is the output still above my target?
Some images need more data to preserve detail. The tool does not guarantee a specific target size.
Will compression change dimensions?
Check the actual output dimensions and available options; byte-size reduction and resizing are separate operations.
Which format should I choose?
JPG often suits photographs; PNG suits transparency and many sharp graphics. Compare both when the destination permits.
Related tools and guides
Check Usage limits for current tier allowances. Individual tools and server safety limits can be lower.