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Compress Image to 500 KB
Compress Image to 500 KB Online — Free & Instant
Compress an image to a 500 KB target for web and CMS uploads, keeping the highest quality under the ceiling.
About Compress Image to 500 KB
Half a megabyte is the comfortable end of the KB ladder: content management systems, marketplace listings, forum attachments, and many email gateways cap images around 500 KB, and most photographs fit under it with little visible loss. This tool binary-searches encoder quality for the largest result at or under 500 KB — photos up to roughly 3000 px on the long side typically pass without any downscaling, and only a truly enormous source would trigger the bounded dimension-stepping, which the result would disclose with its new width and height. The output is JPG for opaque images and WebP when the source has transparency, so logos and cut-outs keep their alpha channel. Every result is checked against your original: if re-encoding cannot produce a smaller file, you get your original back unchanged — a compressor should never grow a file. Batch mode compresses multiple images in parallel across a pool of workers and bundles them into a single ZIP. All of it runs locally in your browser; nothing is uploaded to any server.
Questions
When is 500 KB the right target?
Content management systems, marketplace listings, forum attachments, and many email gateways cap images around 500 KB. It is also a sensible default for web pages that should stay fast without visibly degrading photos.
Will my photo lose visible quality at 500 KB?
Usually not — photos up to roughly 3000 px on the long side keep high quality at half a megabyte. Compress a single image and the before/after slider plus the SSIM score show you exactly how close to the original it stayed.
Can the output ever be bigger than my original?
No. Every result is compared against your original, and if the re-encode comes out the same size or larger, you get your original file back unchanged — a compressor should never grow a file.
Does compressing to 500 KB shrink my image's dimensions?
Almost never at this target — quality alone reaches 500 KB for all but enormous sources. If a downscale ever were needed, the result would report the new dimensions explicitly.
Is my file uploaded to a server?
No. Transmute processes everything locally in your browser using JavaScript and WebAssembly. Your files never leave your device — there is no server, no upload, no cloud processing.