Compress JPEG to 100KB

Getting an image under 100KB

Add one or more images. Each is saved as a JPEG at the highest quality that fits in 100,000 bytes; when quality alone isn't enough, width and height are reduced in proportion. JPEGs that are already under 100 KB are returned unchanged. Each result shows the size in KB and exact bytes, the dimensions and the quality used.

100 KB is a comfortable limit for a profile or CV photo: it usually allows good quality at a size that looks sharp on screen.

Dimensions that work at 100KB

At medium quality (about 1–2 bits per pixel), a 4:3 photo at 100 KB comes out around 730–1,030 px on the longer side. Portraits with plain backgrounds can be larger. If the image is displayed small, for example as a profile picture, set Max width to around 600 px: the file stays under 100 KB at a higher quality.

Keeping detail sharp

• Crop to the subject first so no bytes go on empty background.
• Compress the original, not a copy that has already been compressed. Each JPEG save discards a little more detail.
• Don't enlarge small images to reach a size: extra pixels add bytes but no detail.
• For scanned documents, tick Black and white (grayscale) under More options; text stays legible at larger dimensions.

Press Preview and look at edges and faces. Blocky patches or halos around edges mean quality is too low for those dimensions; a smaller Max width usually fixes it.

PNG and HEIC input

iPhone HEIC photos are decoded in your browser (natively in Safari, otherwise by a decoder that loads the first time you need it) and saved as JPEG. PNG screenshots and graphics are converted to JPEG too, with transparent areas filled with white. For screenshots full of small text, check the preview: JPEG can blur sharp text edges, and the PNG compressor may give a cleaner result.