Compress to 512KB
Get images under 512KB — batch up to 50, in your browser.
Free·No signup·Files never leave your device
How to compress an image to 512KB
Power-of-two limits from developer platforms, met exactly.
Add your images
Drag and drop, or click to browse. Up to 50 images per batch.
Stay under 512KB
The target is fixed at 512KB on this page — upload, run, and download.
Check the size report
The result summary compares total input and output size and tells you how many images missed the target.
Download the results
One image downloads directly. Multiple images are packaged as a ZIP, and your original files stay unchanged.
Compress images: three ways compared
The main differences are installation and file handling.
| What matters | AmiIMG online | Desktop editor | Browser extension |
|---|---|---|---|
| Cost | Free | Varies by product | Varies by extension |
| Install | No install | Required | Extension required |
| Batch of 50 | Supported | Depends on the editor | Depends on the extension |
| Target size | Exact per-image target | Varies by product | Varies by extension |
| File handling | Local in your browser | Usually local; check the editor | Check whether files are uploaded |
Platforms with 512KB caps
Three common reasons to reduce image file size.
Meet an upload limit
When a form caps each image, compression aims to land every file at or under the cap — the summary flags any that miss it.
Prepare images for a page
Reduce large JPG or PNG assets before publishing. Choose the quality level that fits each image.
Send a batch of photos
Process up to 50 images in one batch. Multiple results download together as a ZIP.
Why 512KB exists
Half a megabyte is a common default in app stores, developer APIs, and upload services that think in binary steps.
Private by design
Every operation runs inside your browser. Your images are never uploaded anywhere.
Batch up to 50 images
Add up to 50 images, each up to 30MB. Multiple results download as one ZIP.
Lands under the limit
Target mode tunes quality image by image until each file fits, and says so when one can't get there.
Free & unlimited
No accounts, no daily caps, no watermarks stamped on your files. Ever.
Exact byte accounting
512KB here means 524,288 bytes — the binary value those platforms actually check against.
Compressing to 512KB — FAQ
What does 512KB mean here?
The binary convention: 512KB = 524,288 bytes. Every exported file lands at or under that size, or you get the closest possible result with a clear notice.
My image came out bigger than the target — why?
That can happen when a photo carries more detail than the lowest useful quality can preserve — typically a large, busy image squeezed to a small number. The closest result is delivered and clearly marked as not reaching the target.
Do PNG files stay PNG?
No. Target compression needs a quality dial, so PNG (and GIF/BMP) sources export as JPG. JPG and WebP keep their format.
Is there a limit?
Up to 50 images per batch, each up to 30 MB.
Edit a batch of images in one workspace
Rotate, crop, watermark, remove backgrounds, collage — drag all your images in and export in one go.
Open Image Studio