When 300 KB makes sense
A 300 KB ceiling is practical for content cards, marketplace previews, presentation graphics, and email attachments.
Ready-made target / 300 KB
Compress Image to 300KB
Bring a static JPG, PNG, or WebP under 300 KB with a final byte check in your browser.
FreeNo sign upPrivate
Local tool / no upload
100% browser-sideSet your target
Check complex areas, not just the file size
Texture, foliage, gradients, and small type reveal compression changes first. Inspect those areas before using the downloaded image.
Need another limit?
Return to the main tool and enter any custom size in KB, MB, KiB, or MiB.
Choose a custom size →300 KB answers
Questions about 300 KB.
What the 300 KB ceiling means before you choose an image.
Will the compressed image stay under 300 KB?
Yes. A result is only shown as successful after its final Blob size has been checked at or below the effective 300 KB limit. If the original file is already smaller, the original file size becomes the effective ceiling.
Why can the result be smaller than exactly 300 KB?
300 KB is treated as a maximum, not a byte count that must be matched exactly. Image encoders produce discrete results, so the best valid output may land below the limit.
Can I keep a large image at 300KB?
Possibly, especially when the source compresses efficiently. If quality changes alone are not enough, the tool gradually reduces dimensions until the file fits or reports that it cannot do so safely.
What should I inspect in a 300KB result?
Look closely at fine texture, gradients, edges, and small text. These areas often reveal artifacts before smoother parts of the image do.
Are my images uploaded or stored?
No. Your original and processed images stay inside your browser and are never uploaded to our server. Refreshing or closing the page clears the working image data from the browser. Files you download remain on your device until you delete them.