Compress to 256KB
Free·No signup·Files never leave your device
How to compress an image to 256KB
Forum and wiki limits, met without re-uploading five times.
Add your images
Drag and drop, or click to browse. Up to 50 images per batch.
Fit under 256KB
Compression targets exactly 256KB per image — the size is locked to this page, so there is nothing to configure.
Download
Save images one by one, or the whole batch as a ZIP.
The classic forum cap
A quarter of a megabyte is a long-standing default on forum software and wiki platforms. Avatars and screenshots both have to fit it.
Private by design
Every operation runs inside your browser. Your images are never uploaded anywhere.
Free & unlimited
No accounts, no daily caps, no watermarks stamped on your files. Ever.
Predictable output
The same input always produces the same result — the search is deterministic, so re-runs match what you already checked.
Works everywhere
Any modern browser on Windows, macOS, Linux, iOS, and Android.
Who uses a 256KB cap
Forum avatars and signatures, wiki illustrations, bug-tracker screenshots, and community platforms with fixed upload rules.
Compress images to 256KB in any modern browser
AmiIMG runs fully in your browser on every modern platform.
Windows
Chrome, Edge, Firefox
macOS
Safari, Chrome
Linux
Any modern browser
iOS
Safari on iPhone, iPad
Android
Chrome, Samsung Internet
Compressing to 256KB — FAQ
What does 256KB mean here?
The binary convention: 256KB = 262,144 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.
Are my images uploaded to a server?
No. Compression runs entirely in your browser — your images never leave your device.
Is there a limit?
Up to 50 images per batch, each up to 30 MB.
Related tools
More free image tools from AmiIMG.