Compress an image to 45 KB
A size for web pages that hold many pictures and still need to load fast.
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How it works
Add your images
Drag and drop, paste, or pick files. They upload over an encrypted connection.
Pick a quality or a target size
Use the quality slider, or tell it exactly how many KB or MB you need.
Download
Save each file, or grab them all at once as a ZIP.
45 KB suits a page that shows many pictures at once. Ten images at this weight add up to under half a megabyte, which loads quickly even on a weak mobile connection.
The tool lowers quality in small steps until the file reaches 45,000 bytes or less. It reduces the pixel size only if the quality needed would look crushed, so the picture keeps its natural look.
Think in terms of a whole page, not a single file. Add up the weight of every picture on the page, then decide what each one can afford. A budget of 45 KB per picture is easy to reason about and easy to keep.
What a page of 45 KB pictures weighs
Twelve pictures of 45 KB come to about 540 KB. A typical phone original is five to eight times heavier on its own. Moving a gallery grid from originals to this size is often the largest speed gain a small site can make in one afternoon.
Matching pixels to the layout
A picture shown in a 300-pixel column gains nothing from being 3000 pixels wide. Set the width in Resize to about twice the displayed width, which keeps it sharp on high-density screens, and then compress to 45 KB. At 600 pixels across, 45 KB looks very clean.
Choosing JPEG or WebP
WebP usually reaches the same look in about a quarter less space than JPEG. If your site and your audience handle WebP, choose it in the Format menu. If the file will be passed around by email, JPEG is the safer pick.
Keeping a set consistent
Compress all the pictures in a set to the same target and the same width. A gallery where one picture is crisp and the next is mushy looks careless, even when every file is within budget. Add them together and the same setting is applied to all.
Lazy loading and the weight of a page
Pictures below the fold can load later, but the ones at the top cannot. Compress those first, because they decide how fast the page seems to appear. A top picture at 45 KB arrives almost at once.
A simple budget table
Write the budget down before you start. Eight pictures at 45 KB come to 360 KB, and twenty come to 900 KB. If the total is more than you want the page to carry, lower the number of pictures or the target for the less important ones.
Watching on a real connection shows more than any number in a table.
A plain budget
Write the budget down before you begin. Eight pictures at 45 KB come to 360 KB and twenty come to 900 KB. When the total is more than the page should carry, cut the number of pictures or lower the target for the minor ones.
Once the figures are on paper, decisions get easier and less dependent on gut feeling.
Frequently asked questions
Is 45 KB good for a blog image?
For a picture of 600 to 800 pixels wide, yes. Full-width hero images may want a larger target.
Can I process a whole folder?
Add many files at once and they are handled one after another with the same target.
Will the compressed picture look the same on a retina screen?
Only if the pixel size is high enough. Keep at least twice the displayed width for sharp results.
Why 45 and not 50?
Five kilobytes of margin protects against rounding and header bytes, and over many files it adds up to a visible saving.
Do my uploads stay on the server?
No. Uploads are deleted automatically, and a result kept as a link is removed after one hour.
Can different pictures use different targets?
Yes. Run them in separate batches and set the target for each batch. Hero pictures can take more, small thumbnails can take less.