Your first
smaller file.

From file to result

1. Choose a file. Pick a photo, video, or PDF supported by the released app.
2. Choose your goal. Choose a practical target or quality preset offered by your access level. Target sizes are best effort; an already-small file may remain unchanged.
3. Run compression. Let the operation finish before saving the result.
4. Review the output. Compare size and inspect the content. Save or share the result when it meets your needs.

For an upload limit, leave some room below the limit and check the actual output size. Do not assume every source can reach every target.