Image Compressor

How do you compress an image to 100 KB, or any exact size?

Switch to Target size, type the number of kilobytes, and press Compress. The tool tries a quality, checks the result against your target, and keeps halving the gap, up to ten rounds, until it finds the highest quality that still fits. If even the lowest quality is too big, it shrinks the image by 10% at a time and searches again. Each result says which quality it used and, if it had to shrink the image, the new size in pixels.

That quality number is worth a look. Very low settings make a photo blocky, and below roughly 50% a smaller image at good quality usually looks better than a full-size one squeezed hard. If your target needs that, resize the photo first with the image resizer, then compress it.

How much smaller does each setting make a photo?

We ran the same 2000 × 1333 photo, the Try a sample photo image, through the tool in all three formats:

Three things stand out. Quality 80% already cuts a photo by more than half, with no visible change at normal size. The same quality number does not mean the same file size across formats, so compare results, not settings. And a photo saved as PNG cannot get small without becoming tiny, because PNG has no quality setting to lower.

Why doesn't my PNG get smaller?

Because PNG is lossless: browsers store every pixel exactly and ignore the quality slider, so re-saving a PNG at "80%" gives you the same file. That is the right format for screenshots, logos and graphics with flat colours and text, where PNG files are naturally small. It is the wrong format for photos.

For a PNG, use Target size: the only way to shrink it here is to reduce its dimensions. If the PNG is a photo, export it as JPG or WebP from your photo editor first, then compress that. This tool keeps the format you give it and does not convert between them.

When re-saving would make a file bigger, which happens with PNGs that were already optimized by tools like TinyPNG, you get your original back unchanged and a note saying so, never a larger file labelled as a saving.

What size should an image be for a website or an email?

For a website, the common guidance for a full-width image is about 1920 pixels wide and a few hundred kilobytes, often under 300 to 500 KB, and much less for thumbnails. Width matters as much as kilobytes: a 4000-pixel photo shown in a 800-pixel column wastes most of its size.

For email, Gmail and Outlook.com cap attachments at about 20 to 25 MB, and attachments grow by roughly a third when they are sent, so a batch of phone photos runs out fast. Compressing each photo to 300 to 500 KB keeps them sharp on screen and lets dozens fit in one email. Drop them all at once, then press Download all for a single zip.

Does compressing remove the location from a photo?

Yes, as a side effect. Re-saving the image in the browser keeps only the pixels, so the camera details and the GPS location stored in the photo are left out of the compressed file. The exception is a file that comes back unchanged because it could not get smaller: it keeps whatever it had. To strip the location without changing quality at all, use Remove EXIF.

All of this happens on your device. Your photos are read, re-saved and zipped in the browser, and none of them is uploaded, so there is no upload size limit either, only your device's memory. HEIC photos from an iPhone need converting first with the HEIC to JPG converter.