How to compress an image under 500KB

A 500KB target can retain more resolution than 100KB and often suits forms, email attachments and website content.

What to know before you start

Compression is lossy when quality is reduced. A target KB size is approximate because image detail and format affect the final size.

Recommended workflow

Check the destination’s file format, pixel dimensions and byte limit. For a 500,000-byte limit, choose a target below 488 KB here; this tool uses 1 KB = 1024 bytes.
Open Image Compressor. Try JPG/WebP for photos; keep PNG/WebP for transparency. Set a target size, then reduce maximum dimensions if necessary instead of immediately using minimum quality.
Check every output’s exact byte count and target status. If it is still too large, reduce pixel dimensions and retry. Open it to inspect detail and dimensions before submitting, and keep the original.

How to check the result

Recheck the result against the original input and the rule you intended to apply. Compression is lossy when quality is reduced. A target KB size is approximate because image detail and format affect the final size.

Worked example and limits

For a website banner photo, establish the required pixel dimensions before reducing file size. A decimal 500 KB limit is 500000 bytes; entering 500 KB in this tool means 512000 bytes. Leave headroom and inspect the downloaded byte count. Submit only after checking readability, format and dimensions. No compression setting can guarantee every image will meet the limit.

Frequently asked questions

Can I compress an image to an exact KB size?

You can aim for a target size, but the final file can vary. Image complexity, dimensions and encoder behavior make an exact byte target impractical in one pass.

Are my photos uploaded?

The compressor is designed to process supported images in the browser. Keep the original file and verify sensitive work before sharing.

Image Compressor

Batch-compress JPG, PNG and WebP, set quality, maximum dimensions or an approximate target size, compare results and download files or a ZIP.

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