Image Target Size Compressor - compress a picture to a target KB size locally

Real-world use cases

• Get an application photo under a strict 200 KB upload limit

  A school, visa, or government form rejects anything above 200 KB, but your phone portrait is 3.8 MB. Upload it, set the target to 200 KB, choose JPEG, and let quality search run first. If the original dimensions are still too heavy, the tool downscales only as much as needed and reports the final width, height, output size, and error so you know whether the form should accept it.

• Prepare a product image for a marketplace size gate

  Some marketplace dashboards accept large photos visually but impose a quiet byte cap during upload. Use WebP when the marketplace allows it, or JPEG when it does not. The result's "attempts" count tells you whether quality alone was enough or whether the compressor had to shrink dimensions, which helps catch images that became too small for zoomable product galleries.

• Make a support screenshot small enough for a ticket system

  Ticket tools and CRMs often cap attachments around 1 MB, while a full-screen PNG can be several megabytes. Try PNG first if text sharpness matters; if the warning says the target is not reached, switch to WebP and keep the same target. You get a readable file that fits the support portal without sending the screenshot through a third-party compressor.

• Create a near-exact KB image for email or chat

  When an old email gateway or chat app rejects big images, guessing quality sliders wastes time. Enter the actual attachment limit, compress once, and inspect the output size plus byte error. Because the algorithm prefers the closest under-target output, you avoid both rejection from oversized files and unnecessary extra quality loss from over-compressing.

• Compare JPEG versus WebP for the same target

  Run the same source once as JPEG and once as WebP with the same KB target. The preview, output dimensions, and attempt count make the tradeoff visible: WebP may keep larger dimensions at the target, while JPEG may be required by older upload systems. This gives you evidence before deciding which file to send.

Common pitfalls

• Setting a target far below what the visual use case can tolerate. A 20 KB target for a detailed 4000 px photo will force heavy downscaling; raise the limit if the destination allows it.

• Choosing PNG for normal photos. PNG is lossless and usually huge for photographic content, so strict KB targets are better served by JPEG or WebP.

• Treating the target as a quality setting. The algorithm may lower quality or dimensions depending on the source image; always check the output preview and dimensions before uploading.

• Re-compressing an already compressed result repeatedly. Each JPEG/WebP pass can lose detail; keep the original and rerun from it when changing targets.

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