PixelUp engine
Free AI image upscaler that keeps your pixels private.
Enlarge photos, product shots, AI art, scans, and thumbnails directly in your browser. Use local TensorFlow.js super resolution for 2× detail recovery, or fast 4× canvas upscaling when you need a bigger export.
Best for web graphics, old low-res photos, ecommerce thumbnails, and social images that need more pixels without a paid SaaS workflow.
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Drop image here or click to browse
Supports PNG, JPEG, WebP, GIF, BMP, TIFF
sample preview
See what “more pixels” means before you upload.
This synthetic browser-safe demo shows the intended effect: a small source becomes a larger export with cleaner edges. Real photos stay on your device and can vary by texture, text, and face detail.
before · 640px
after · 2× AI target
private upscaler comparison
PixelUp vs Upscayl, Let’s Enhance, and Bigjpg
| Tool | Approach | Best fit |
|---|---|---|
| PixelUp | Browser-local AI 2× + fast 4× | Private photos, quick web graphics, no signup |
| Upscayl | Desktop/open-source AI upscaling | Batch desktop workflows and larger local jobs |
| Let’s Enhance | Cloud AI enhancement SaaS | Professional campaigns, stronger models, paid credits |
| Bigjpg | Cloud AI enlargement | Anime/art enlargement and hosted processing |
Private by design
Images are read as browser blobs and processed locally. Nothing is uploaded to our servers.
AI when it matters
The 2× mode loads an open-source TensorFlow.js super-resolution model for real client-side enhancement.
Practical 4× exports
For larger files or quick workflows, Fast HQ uses high-quality canvas scaling plus controlled edge recovery.
FAQ
Free AI image upscaler questions
Is PixelUp really free?
Yes. The upscaler runs in your browser with no signup, watermark, or upload queue. It is designed as a practical free alternative when you need one image improved quickly.
Is 4× also AI?
Not in this MVP. AI mode is intentionally limited to 2× so the model can run locally. 4× uses high-quality canvas scaling and edge recovery for speed and large exports.
How does it compare with Upscayl, Let’s Enhance, or Bigjpg?
PixelUp focuses on instant browser privacy. Desktop tools and paid SaaS products can offer stronger models, batch queues, and face restoration, while PixelUp is best for no-upload quick fixes.
What image size should I use?
AI 2× works best on small to medium images up to about 900k source pixels. For large photos or mobile browsers, Fast HQ avoids model memory limits and still gives a larger PNG export.