Sites built with UPNG.js
PNG image encoder and decoder with support for lossy compression.
15 sites
12 found by StackScope, 3 via launch platforms
- StackScope Discovery (Indie) 11
- StackScope Wider Web 1
- Product Hunt 3
UPNG.js has been detected on 15 launches we've crawled. Most recent detection: DBR's Image Labs - Free Image Converter & Compressor, on September 21, 2026.
It's most commonly paired with pako, Google Fonts, and HSTS.
Domain endings using UPNG.js
15 sites
- .com 46.67%
- .app 20.00%
- .online 13.33%
- .dev 6.67%
- .org 6.67%
- .xyz 6.67%
Share of new sites using UPNG.js
Each dot is one launch day. Line is the 7-day rolling average; weekly averages before July 2026. Chart starts at first detection.
The shaded parts of the chart are measured against a different set of sites.
Grey: until 8 July 2026 we only tracked launches from launch platforms. From that date we crawl the wider web as well.
Amber: on 10 September 2026 we improved our infrastructure so we can index new sites much sooner, often on the day they go live. Sites found that early often haven't finished setting up, so anything usually added after launch reads lower from that date. We record each site as it was when we found it.
The share is a proportion of whatever we were tracking at the time, so it can step at these lines without the technology itself changing. For a single continuous measure, switch to launch platforms.
Javascript Library leaders
| Tool | % of launches | % of category | ||
|---|---|---|---|---|
| #1 | – |
jQuery
|
14.40% | 34.82% |
| #2 | – |
React Router
|
6.67% | 16.13% |
| #3 | – |
Motion
|
6.14% | 14.85% |
| #4 | – |
TanStack Router
|
4.34% | 10.49% |
| #5 | – |
Swiper
|
3.57% | 8.62% |
| … | ||||
| #724 | ▼76 |
UPNG.js
Current page
|
<0.01% | <0.01% |
Percentages show adoption among indie launches: the share of all analysed launches, and of launches using any Javascript Library tool.Among September launches it ranked #776 in Javascript Library, down from #700 in August. All 1447 in Javascript Library →
Often used with
| Tool | Sites |
|---|---|
pako
|
14 |
Google Fonts
|
7 |
| HSTS | 7 |
Google Search Console
|
6 |
Cloudflare DNS
|
6 |
Tools most often detected on the same sites as UPNG.js.
Recent launches we can show
14 of the 15 sites using UPNG.js are product launches we list individually. The other 1 are sites we found crawling the wider web: they count towards the figures above, but we do not publish them one by one. How StackScope Discovery works
Zipetto — Convertisseurs gratuits en ligne, privés et sans upload
Productivity
Photezy – Bulk Resize, Remove Background & Rename Photos Online Free
Design
Compress Anything Free — 100% Private, No Upload | CompressPrivate
Productivity
Free Image Compressor — Compress Images in Your Browser
Design
JS Paint
Photoemu — Free Online Photo Editor | PSD, PNG, JPG & More
Design
PixelShrink Pro
Design
设计家·工具箱
Productivity
Direct Online File Converter | PNG, JPG, WebP, HEIC, SVG, TIFF & More
Tap and Hold Image Generator — X (Twitter) Long Press Image Trick
Tap and Hold Image Maker
Showing the most recent 12 of 14.
The StackScope API serves all 15 sites using UPNG.js, filterable and exportable, from £15 a month.