How to compress image
- Tap Choose a photo and pick one or more JPG, PNG or WebP files.
- Leave the quality as it is, or open Advanced to set it yourself.
- Tap Compress photo and wait for the new size to appear.
- Check the new size on the photo, then tap Save the file.
What gets thrown away, and what does not
JPEG compression discards the detail your eye is least likely to miss — fine gradients in a blue sky, texture inside a shadow — and keeps the edges and faces that you actually look at. That is why a nine megabyte holiday photo can land near four hundred kilobytes and still look correct at arm’s length on a phone.
What never changes is the file on your device. The tool reads your photo, builds a smaller copy, and hands you that copy to download. The original is untouched, because nothing is written back and nothing is uploaded.
Compressing several photos at once
Up to thirty images can go through together and they come back as a single ZIP. Thirty is not a plan limit — there is no plan — it is roughly what a mid-range Android can hold in memory without the browser killing the tab. On a laptop you could do more; the cap is set for the harder device because that is who mostly arrives here.
Each photo is processed one after another rather than all at once, so a long batch stays responsive and the Cancel button keeps working the whole way through.
When you need an exact file size
Government forms, university portals and job applications usually name a number: under 50 KB, under 100 KB, under 200 KB. Guessing at a quality slider until you happen to land under it is the wrong tool for that job. The pages linked below take the number as the input and search for the quality that hits it, which is the thing none of the large converters will do for you.