Reduce Image Size in KB

Compress images to an exact size target right in your browser.

Select or Drag & Drop Images Here

Target size

Output format

Why shrink images?

Big photos slow everything down. Pages feel sticky, messages fail to send, and email uploads time out. Cutting file size fixes that without turning your picture into a blurry mess. You get faster loads, snappier sharing, and happier readers.

How this tool hits your target

You set a size in KB. We search for the highest possible quality that still lands at or under that target.
JPEG or WebP gives the best control since we can adjust quality precisely. PNG is supported but it does not have a quality slider.
If quality alone is not enough, we gently scale the image down to keep edges clean and text readable.
Everything processes in your browser. Your files never leave your device.

Quick start

Select or drag in up to 10 images.
Enter a KB target like 50, 100, or 200.
Choose JPEG or WebP for best results.
Click Reduce Size and download the ZIP.

Which format should I use

Format	Best for	Pros	Considerations
JPEG	Photos and screenshots without transparency	Small files, wide support, adjustable quality	Not ideal for flat graphics or crisp UI lines
WebP	Photos on modern browsers and apps	Often smaller than JPEG at similar quality	Older software may not support it
PNG	Logos, UI, images that need transparency	Lossless and crisp for flat colors	Larger files and no quality control, so KB targets can be harder

What size should I pick

Use these as starting points. Bump up if your image has small text or fine detail.

Chat and messaging: 60 to 120 KB per photo
Email attachments: 100 to 200 KB per photo
Blog thumbnails: 40 to 90 KB
Hero images: 150 to 350 KB if you can afford it
Logos and UI: often PNG, keep under 50 to 120 KB if possible

Quality tips

If you see banding in gradients, raise the target slightly or try WebP instead of JPEG.
For screenshots with tiny text, keep a higher KB target or reduce the image width only a little. Over-shrinking hurts readability fast.
Avoid upscaling. Smaller dimensions with slightly higher quality usually look better than a large, over-compressed image.

Privacy and performance

ImgRizz runs completely in your browser using HTML Canvas. No uploads, no accounts, and no waiting on a server. Large images are processed efficiently, and batches are bundled into a single ZIP for quick downloads.

FAQ

Will my image look worse

Some compression is inevitable. The tool aims for the best possible quality that still meets your KB target. If it looks soft, increase the target or try WebP.

How exact is the KB target

We use a binary search to dial in quality, so results are typically at or just under your number. If the image is extremely complex, we may apply a slight downscale to reach the target without obvious artifacts.

Does DPI matter on the web

No. Websites care about pixels, not DPI. DPI is printing metadata. Changing DPI does not change file size or how big an image looks on a screen.

Do you remove EXIF or location data

Canvas exports do not include most original metadata. That usually saves a few KB and is better for privacy. If you need metadata preserved, export the original before compression.

Can I convert HEIC to JPEG or WebP

Yes, as long as your browser can decode the file. Drop a HEIC, pick JPEG or WebP as output, and export. If a HEIC fails to load, convert it locally first.

Does this support transparency

Yes when you choose PNG or WebP. JPEG does not support transparency and will fill transparent areas with a background color chosen by the browser.

What about animated GIFs

This tool handles static frames. For animated GIF optimization, use a GIF-focused compressor. If you only need a still thumbnail, export one frame as JPEG or WebP.

Is there a file size or dimension limit

Modern browsers handle very large images, but memory is not infinite. If you hit issues with huge panoramas, try compressing in smaller batches or reduce dimensions slightly first.

Will this overwrite my originals

No. Downloads are new files in a ZIP. Your originals are untouched.

Why does PNG ignore the target

PNG is lossless and has no quality setting. We still optimize the pixel data, but if you need to land on a specific KB number, choose JPEG or WebP.

Can I keep the exact width and height

Yes. If your target is not extremely small, the tool keeps the original dimensions and only adjusts quality. If it cannot reach the KB target, it will downscale gently.

Does it work offline

If you install ImgRizz as a PWA, most browsers will let it run offline. Even without that, everything runs locally once the page is loaded.

Why do you bundle results in a ZIP

ZIP keeps your downloads tidy and avoids a dozen save dialogs. It also preserves file names and extensions cleanly.

Any rules of thumb for social uploads

Most platforms recompress your image. Sending a clean JPEG or WebP between 60 and 200 KB keeps quality high while avoiding double compression penalties.