Scale images to a maximum width or height, or by a percentage, keeping the aspect ratio.
Resizing makes the image less wide and tall: fewer pixels. Compressing keeps the pixels and makes the file smaller in KB or MB. For an email or a website, both help.
For a screen or an email, 1600 to 2048 pixels on the longest side is plenty, for social media often 1080. For printing, count on 300 pixels per inch: a 4 × 6 inch photo is then 1200 × 1800 pixels.
Making it smaller gives no jagged edges: the pixels are carefully averaged. Enlarging does not make a photo sharper, because no detail is added.
No. The work happens in your own browser, on your computer or phone: your file is not sent to our server. Only if you then choose to send the result as a download link is it uploaded.
Yes, up to a limit. Without an account you can do 3 operations per category (all PDF tools count together, for example) in a session, and with a free account 10 per category. If you need more, you need a subscription. See the prices.
Yes. After the operation you can send the result as a download link, even if it is too large for an email attachment. To do so, sign in or create a free account.