Using Compress Image
Create a smaller image by re-encoding it with a selected output quality. This is useful when an upload form rejects a photograph because the file is too large. Compression changes the encoding; it does not guarantee that every input becomes smaller or that the appearance stays identical.
Worked example
If a photograph is too large for a 2 MB upload limit, run compression and compare the output size with the limit. Open both versions at 100% zoom and look at faces, lettering, and sharp edges. If the compressed file is still too large, reduce its pixel dimensions with Resize Image and try again.
What to check and what this tool cannot do
Lossy formats can introduce blur, blocks, or halos around edges. Already-optimized files may save little space or even grow. The browser may not preserve EXIF metadata, camera information, animation, or the original color profile. Converting to a format without transparency can change transparent areas.
Getting a useful result
Keep your original for printing or future edits. Avoid repeatedly compressing the last compressed copy; work from the original each time. A reduction in file size is useful only if the image still communicates what the viewer needs. Review the filename, format, dimensions, and downloaded size before replacing a website image.
Where processing happens
Developer and text tools process input in your browser. PDF and image tools may attempt local conversion and use server processing when local conversion is unavailable. Website requests and usage analytics are separate from the content you enter. Large files can exceed your device’s available memory. See how tools work and our privacy policy.
Found an incorrect result? Report it with a non-sensitive example.