Image compressor: reduce image size in KB

Pick a target like 50 KB and get a JPG, PNG or WebP at or just under it. Free, and your photos never leave your device.

Target size
Advanced options
Output format

Processed on your device. Your files are never uploaded.

Related tools

How to use

  1. Add one or more images: tap "choose files", drag them onto the box, or paste a copied image.
  2. Pick a target size such as 50 KB, or choose Custom and type your own number.
  3. Wait a moment while each image is compressed. The result shows the new size next to the old one.
  4. Download each image, or all of them at once as a ZIP file.
The same photo before compression, 1.1 MB

Original iPhone photo (HEIC): 1.1 MB

The same photo after compression to 50 KB, 42.5 KB, shown at its real size of 387 × 516 px

Compressed to 50 KB: 42.5 KB, 387 × 516 px

The same iPhone photo before and after compressing it to 50 KB with this tool's settings. The compressed file is 387 × 516 px; it is never shown larger than that.

How to reduce image size in KB

Online forms, job portals and email often accept only small files, for example a photo under 50 KB or a signature under 20 KB. To reduce image size in KB, this tool tries different quality settings and picture sizes until the file lands at or just under your target, then keeps the best-looking version that fits.

You do not need to press a start button. As soon as you add images or change the target, the tool works on them again. Several images can be compressed together, and each one gets its own result and download button.

JPG, PNG, WebP and iPhone HEIC photos are accepted. The result is a JPG unless you choose another format under Advanced options.

Set a size range: minimum and maximum KB

Some forms reject files that are too small as well as too large, for example “between 20 KB and 50 KB”. Open Advanced options and tick Set a minimum size to give the tool both limits.

  • If the image is too big, it is compressed until it is under the maximum.
  • If the image is too small, the tool raises the quality and, if needed, makes the picture larger until it reaches the minimum.
  • If the image already sits inside the range, you get it back as it is, only with hidden details such as location removed.

The range must leave a little room. A minimum of 49 KB with a maximum of 50 KB cannot work, because of how kilobytes are counted (see below), so the tool asks for a wider gap.

What a photo looks like at 20, 50 and 100 KB

We ran three sample photos through this tool to show what each target leaves you with. The table shows the width and height of the result. JPG quality stayed between 70 and 80 %, which looks clean on a phone or in a form.

Photo 20 KB 50 KB 100 KB
iPhone, landscape 373×279 655×491 985×738
iPhone, portrait, detailed 245×327 387×516 548×730
1920×1440 photo 327×245 516×387 730×548

Both iPhone photos were 12 megapixels (4032×3024). At 200 KB they kept 1491×1119 and 860×1146 pixels. Measured in November 2026. Your numbers will differ: photos with fine detail (leaves, crowds, printed text) need more bytes, and plain backgrounds need fewer. Crop away what you do not need before compressing and the picture can stay larger.

KB and MB: why your computer may show a slightly different size

A kilobyte is counted two ways. Windows and many websites count 1 KB as 1,024 bytes; phones, Macs and other websites count 1 KB as 1,000 bytes. The same file can therefore show as 48.8 KB on one screen and 50 KB on another.

To be safe on both counts, a result for a 50 KB target is never more than 50,000 bytes, and a minimum of 20 KB means at least 20,480 bytes. The size shown on this page uses the Windows count and is rounded up, so a file that is over a limit never looks like it is under it. One megabyte here means 1,000 KB.

JPG, PNG or WebP: which format to choose

  • JPG is the right choice for photos and for almost every form. It shrinks well and opens everywhere. It is the default.
  • PNG keeps every pixel exactly, which suits screenshots, logos and drawings, but photos stay large. To fit a PNG under a small target, the tool has to make it much smaller in width and height, and it will suggest switching to JPG when that happens.
  • WebP makes smaller files than JPG at the same look and works in all modern browsers, but some forms and older programs do not accept it. Use it for your own website or for sharing, not for official forms. It only appears if your browser can create WebP files.

Your photos stay on your device

Your images are compressed by your own browser, on your phone or computer. They are never uploaded to our server or to anyone else, and nothing is stored after you close the page. This also means it is fast: there is no upload or download wait, only the time your device needs to do the work.

When a photo is compressed, hidden details such as the location where it was taken, the camera model and the date are removed from the new file.

Frequently asked questions

How do I reduce a photo to 50 KB without losing quality?

Some detail is always lost when a photo shrinks to 50 KB, because most phone photos start at 2 to 5 MB. This tool keeps the picture clean by holding JPG quality at a good level and making the width and height smaller instead. For the best result, crop the photo to just what you need first (for example your face for an ID photo) and use a plain background.

How can I increase an image's size in KB?

Open Advanced options, tick "Set a minimum size" and enter the smallest size your form accepts. If your image is below it, the tool first raises the quality and then makes the picture larger until it reaches the minimum. Making a picture larger cannot add detail that was never there, but it does meet the size rule.

Why does my file still show as over the limit?

Some websites count 1 KB as 1,000 bytes and others as 1,024 bytes. Our results stay at or under the target by both counts, so a 50 KB result is never more than 50,000 bytes. If a form still says the file is too big, check that it wants a JPG, check its pixel size rules, or try a slightly lower target such as 45 KB.

How do I compress an image on my phone?

Open this page in your phone's browser, tap "choose files" and pick the photo from your gallery or camera roll. The compressed photo downloads to your Downloads or Files app. Nothing needs to be installed.

Does reducing the KB change the width and height?

Usually yes. Making the picture smaller is the cleanest way to save bytes. If your form needs exact pixel dimensions, open Advanced options and tick "Keep the original width and height". The tool then lowers the quality instead, which can make the picture look blocky at small sizes.

Is this image compressor free?

Yes. There is no sign-up, no watermark and no daily limit. You can compress up to 20 images at a time, each up to 50 MB.