Reduce photo file size for chat apps and email
Phone photos easily go over 5 MB. That breaks email attachment limits, takes ages to send on mobile data and gets rejected by many forms. Compressor fixes it in seconds.
For chat apps and social media
Use JPG, quality 75 and a longest side of 1280. The photo ends up at a few hundred KB and still looks sharp on a phone. Chat apps compress photos their own way; sending a light version lets you control the result.
For email attachments
Most email services accept 20 or 25 MB per message. With JPG 75 and a longest side of 1920, ten photos usually fit in one email. If there are many, use "Download all (.zip)" and attach a single file.
For forms with a limit (1 MB, 500 KB)
Documents and profile photos often have small limits. Start with JPG, quality 70 and a longest side of 1280. If it's still too big, go down to 800. The final size shows on the image's row before you download it.
For your website
Prefer WebP: the file is smaller than JPG with the same look, and the page loads faster. For full-width images 1920 is enough; thumbnails and cards look fine at 800.
What about privacy?
Phone photos store the location where they were taken. Compressor removes that data (EXIF) from every image, so the photo you send doesn't say where you were.