100 KB is a common upload limit — generous enough for a clear photo, but a phone picture is usually 20 to 50 times larger. The good news: 100 KB is plenty of room to keep an image sharp, as long as you compress it the right way. Here's how.

Why forms ask for 100 KB

100 KB sits in a comfortable middle ground: bigger than the strict 20–50 KB photo limits, so the image stays detailed, but small enough to upload quickly and store cheaply. Many job portals, document uploads and ID forms use it for scans and photos where clarity matters more than a tiny file.

Resize the pixels first

The biggest mistake is compressing a full-resolution photo straight to 100 KB — the result looks soft because there's too much detail for the file size. First resize the image to the dimensions you actually need; for a passport-style photo, around 600×800 px is ample at 100 KB. With fewer pixels to store, the compressor barely has to reduce quality.

Compress to exactly 100 KB

Open the compress to 100 KB page (the target is preset) or the general Image Compressor and type 100. Upload your resized image and download — the tool runs a quality search to land at or just under 100 KB while keeping it as sharp as possible. Need a different limit? Resize image in KB lets you type any number.

Keep it sharp

  • Save photos as JPG — it compresses far more efficiently than PNG.
  • Start from a well-lit photo on a plain background; clutter wastes your KB budget.
  • Resize before compressing, never the other way round.
  • Always work from the original file, not an already-compressed copy.

Everything runs in your browser, so your photo is never uploaded to a server.