Compress any image to 3 KB online for free. Ideal for micro-thumbnails, favicons, email pixel trackers, and ultra-minimal web assets. No sign-up, works entirely in your browser.
Designed for micro-thumbnails, favicons at 16×16 or 32×32 px, email open-tracking pixels, and minimal decorative web elements that must weigh virtually nothing.
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To compress an image to 3 KB (3,072 bytes) for free, drop it into SammaPix Compress and adjust the quality slider until the output meets the target — for most photos, quality 10-30% reaches 3 KB. Processing happens 100% in your browser using the Canvas API — no upload, no signup, no watermark. Tested on 100 real images: SammaPix matched SSIMULACRA 2 quality scores above 65 (no visible loss) at all output sizes >= 50 KB. For sizes below 25 KB, expect visible compression artifacts on photographic content — vector-style images and screenshots fare best.
Open the SammaPix Compress tool and drag your image into the drop zone. Supports JPEG, PNG, WebP, and GIF.
Adjust the quality slider until the output size is at or below 3 KB. Lower quality = smaller file.
Download your compressed image instantly. Everything runs in your browser — your photos never leave your device.
Typical results when compressing a photo to 3 KB.
| Property | Original | Compressed |
|---|---|---|
| File size | 45 KB | 3 KB |
| Quality | 100% | 40-55% |
| Size reduction | — | ~93% |
| Format | JPEG / PNG | JPEG / WebP |
At 3 KB, your image must be tiny — resize to 64×64 px or smaller before compressing for any recognizable result.
Use indexed-color PNG (palette mode with 8-16 colors) for icons — it often beats JPEG at this extreme file size.
Strip absolutely all metadata using our EXIF Remover — at 3 KB, even a few hundred bytes of EXIF data is a significant percentage of the file.
For email tracking pixels, a 1×1 px transparent PNG is already under 1 KB — you only need compression if you are embedding a visible micro-image in the email body.
Ready to compress?
Use Compress to reduce your images to 3 KB or below, or Convert to WebP for even smaller files at the same quality.
Yes, but only at very small dimensions. A 32×32 favicon or a 48×48 avatar looks clean at 3 KB. Anything above 100×100 px will show heavy compression artifacts at this size.
Common uses include browser favicons (16×16 to 48×48 px), email open-tracking pixels (1×1 px), tiny placeholder thumbnails for lazy-loaded galleries, and micro-icons in notification badges.
For icons and graphics with flat colors, PNG with a reduced palette wins. For photographic content at this extreme size, WebP delivers the least blurriness. JPEG struggles below 5 KB due to its header overhead.
Export your icon at 32×32 px in PNG format with 16 or fewer colors. This alone is usually under 3 KB. If not, open it in SammaPix Compress, lower quality to 30-40%, and save. The .ico format can embed multiple PNG sizes — keep only 16×16 and 32×32 to stay under 3 KB total.
Compress to 5 KB
Perfect for favicons, email signature logos, tiny thumbnails, and any context where you need the absolute smallest possible image file.
Compress to 8 KB
Ideal for web icons, small avatars on forums and chat apps, placeholder images for lazy loading, and any asset served to users on extremely slow mobile connections.
Compress to 10 KB
Perfect for web thumbnails, mobile app preview images, form upload requirements, and any use case where images must load instantly on slow connections.
100% private
All compression happens in your browser. Your images never leave your device — nothing is uploaded to any server.
Instant results
No waiting for server processing. Compress images in milliseconds using your device's own hardware.
Free, no limits
Compress as many images as you want. No watermarks, no sign-up, no daily caps on the free plan.