PNGReducer
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Browser-based · No uploads · 100% Private

Compress JPEG to 500KB or Less

Drag & drop up to 10 images (max 30MB each). Your files are compressed right in your browser and never uploaded to a server.

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How It Works

How to Compress a JPEG to 500KB Online

Many upload forms, email clients and CMS platforms cap images at 500KB. PNGReducer shrinks JPEG, PNG and WebP files to fit under that limit without changing their width or height, and it does everything in your browser.

  1. Add your images. Drag and drop up to 10 files (30MB each), or tap Select Images.
  2. Click Compress All. The tool tests different JPEG quality levels and keeps the highest one that stays at or under 500KB.
  3. Download. Save files one by one, or use Download to get every compressed image.
PNGReducer interface compressing a JPEG photo to under 500KB
Compressing a JPEG to 500KB with PNGReducer.

What affects the final file size?

JPEG is lossy: it discards fine detail and color information to save space. Photos with smooth gradients compress easily, while sharp, noisy or highly textured images need a lower quality setting to fit. If a very large or very detailed image cannot reach 500KB at the lowest quality, the tool returns the smallest result it can produce. In that case, resize the image to smaller dimensions first, then compress it.

Files that are already JPEGs under 500KB are returned unchanged, so you never lose quality for nothing. PNG and WebP files are converted to JPEG.

Is 500KB the right target?

500KB suits portfolio galleries, product photos, government and job-portal uploads, and email attachments, where visible detail matters and the limit is fixed. For fast-loading web pages, especially hero images that affect Largest Contentful Paint, smaller files (often 100–200KB, plus modern formats like WebP or AVIF and proper sizing) are usually the better choice. Use our 300KB or 100KB compressors for those cases.

Private, in-browser processing

PNGReducer uses the HTML5 Canvas API to re-encode images locally. Your files are not sent to a server, so unreleased or sensitive images stay on your device.

Transparent PNGs: JPEG does not support transparency. If you upload a PNG or WebP with transparent areas, those areas are filled with a white background during conversion.

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Frequently Asked Questions

What happens to image quality at 500KB?
500KB leaves plenty of room for most photos, so quality usually stays high and the difference from the original is hard to spot at normal viewing sizes. Very large originals (for example 20MB camera files) have to give up more detail, so you may see softening when zooming in.
No. PNGReducer runs entirely in your browser using local JavaScript. Your files never leave your device.
No. The original width and height are preserved. Only the JPEG encoding quality is adjusted to reach the 500KB target.
The tool picks the highest quality that fits at or under 500KB, so results often land slightly below the limit depending on how complex the image is. JPEG files that are already under 500KB are returned unchanged. If a very large or detailed image cannot reach 500KB even at minimum quality, the tool gives you the smallest result it can; try resizing the image first.
PNG and WebP files are converted to JPEG to reach the size target. JPEG does not support transparency, so transparent areas are replaced with a white background.