MarukitCompress Image to 500KB
Marukit's Compress Image to 500KB is a free web tool that gets a JPG, PNG or WebP image under 500 KB at the highest quality that fits, for upload forms, websites and email.
Your images are processed inside your browser and are never uploaded to our servers.
About this tool
500 KB leaves plenty of room, so most phone photos keep their full pixel size and only the quality is lowered a little. The before/after slider shows what changed, and the exact size is shown before you download.
Other sizes: 20 KB · 50 KB · 100 KB · 200 KB · 1 MB
How to use the 500KB image compressor
- Choose your image (or up to 20 images).
- Pick JPG (most compatible) or WebP (smaller, for websites).
- Keep 'Reduce dimensions if needed' on unless the pixel size must stay the same.
- Press Compress, check the exact size, and download the result.
Not working? Quick fixes
- 'Couldn't reach 500 KB without reducing dimensions': turn on 'Reduce dimensions if needed' and try again.
- 'This image is already under 500 KB': no compression is needed, so you can download the file as it is.
- An iPhone HEIC photo won't open: convert it with HEIC to JPG first, then compress.
Supported formats
- Input
- JPG, PNG, WebP (plus GIF, BMP and AVIF if your browser can open them)
- Output
- JPG or WebP
- Processing
- In your browser
Limitations
- The target is just under 500,000 bytes, so it fits a 500 KB limit whether the form counts 1 KB as 1,000 or 1,024 bytes.
- Very large or detailed images may need to be made a little smaller in pixels to fit; leave 'Reduce dimensions if needed' on.
- Transparent areas become white in JPG output.
- 50 MB maximum input size.
- Camera details and GPS location are not kept in the output image, unless the image is already under the target and is returned unchanged.
Frequently asked questions
Will compressing to 500 KB make my photo look worse?
Usually not on a screen. 500 KB is enough for a full-size phone photo at good quality. Use the before/after slider and zoom in on fine detail to check.
How do I compress a JPEG to 500 KB for free?
Choose the photo, keep JPG as the format and press Compress to 500 KB. The tool finds the highest quality under 500 KB, free and without signup.
Can I compress a photo from several MB to 500 KB?
Yes. Leave 'Reduce dimensions if needed' on so very large photos can be made a little smaller in pixels when quality alone isn't enough.
My form says 300 KB or 400 KB. Can I use this?
Yes. Type that number in Target size and press Compress. The button changes to match.
Can I compress several photos at once?
Yes. Add up to 20 images: each one is compressed with the same target and settings, and you can download them one by one or all together as a ZIP.
Is my photo uploaded?
No. Everything runs in your browser on your device.