oskilo

Compress image

Drop images here

JPG, PNG, WebP, HEIC, AVIF, GIF or BMP. Files stay on this device.

Format
75
PNG colors

The image compressor reduces the file size of photos. It helps when a photo you must upload to a form is over a 2 MB limit, when pictures attached to an email take up too much room, or when you want to lighten images for your website. It opens JPG, PNG, WebP, HEIC, AVIF, GIF and BMP files.

You can add several images at once and all of them are compressed in your browser, never sent to a server. The before and after comparison lets you check quality with your own eyes.

How to use

  1. Drop the images on the page or add them with the Choose images button. You can add more later with Add, up to 50 files.
  2. Under Format pick Same, JPG, WebP or PNG. Same keeps each file's own type.
  3. Use the Quality setting to balance size against appearance. If you pick PNG, PNG colors appears in place of Quality. Its Lossless choice compresses without reducing colours.
  4. If you need to fit a limit, choose 100, 200, 500 or 1000 kB from Max size. Custom lets you type your own kB value. You can also shrink the pixel size with Longest side.
  5. Drag the divider in the Before and after view, and zoom in to check the difference. The Saved column shows how much space you gained.
  6. Press Download on a single row, or Download all to take every file.

When it helps

Application and government systems often limit photo uploads to something like 200 kB or 500 kB. Set Max size to that value and the tool finds the highest quality that fits. A 5 MB photo of a document taken on a phone drops to a few hundred kB this way.

Shop listings, blog images and email attachments work much the same. Compressing product photos helps pages open faster, and shrinking pictures before you send them saves mobile data.

Tips

  • Compression re-encodes the picture, so EXIF data such as camera model and location is removed and colours are converted to sRGB.
  • A file that is already small is left as it is and marked Original kept. In that case its metadata stays too.
  • If the limit cannot be reached by quality alone, the tool shrinks the image in small steps. The note on the row says it was scaled.
  • A quality around 75 usually looks fine on screen for JPG and WebP. For screenshots with text, PNG gives a cleaner result.
  • Keep the original if you will print it or archive it, and use the compressed copy only for uploading and sharing.

Questions

Are my photos uploaded?

No. The images are compressed by your browser and never sent to a server.

How do I compress an image to under 200 KB?

Set Max size to 200 kB. The tool finds the highest quality that fits and, if the picture is still too big at low quality, scales it down in small steps until it does.

Does compressing lower the quality?

JPG and WebP lose a little detail at lower quality settings, and around 75 usually looks fine on screen. PNG gets smaller with fewer colors, or stays identical with Lossless.

What happens to EXIF data and color profiles?

Compressing re-encodes the image, which removes EXIF data such as camera model and location and converts colors to sRGB. A file returned unchanged because it was already small keeps its metadata.