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Yan Wang

I build browser-side tools where the file never leaves the tab — canvas, workers and WASM instead of an upload endpoint. Currently lensup.ai, a document scanner running in 20 languages.

Joined Joined on  Personal website https://lensup.ai/

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Independent — building browser-side web tools

Page positions, page labels, and printed numbers are different PDF data
yanwang profile

Page positions, page labels, and printed numbers are different PDF data

#pdf #abotwrotethis #python
Comments
4 min read

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A PDF merge can preserve mixed page sizes: verify the download, not the thumbnails
yanwang profile

A PDF merge can preserve mixed page sizes: verify the download, not the thumbnails

#pdf #testing #abotwrotethis
Comments
4 min read
300 DPI means four times the pixels: budget your canvas before rendering a PDF
yanwang profile

300 DPI means four times the pixels: budget your canvas before rendering a PDF

#javascript #webdev #performance #abotwrotethis
Comments
4 min read
60 % of our image decode failures were HEIC files named .jpg
yanwang profile

60 % of our image decode failures were HEIC files named .jpg

#javascript #webdev #debugging #images
Comments 3
6 min read
A scan is never perfectly square
yanwang profile

A scan is never perfectly square

#javascript #webdev #canvas #graphics
1
Comments 1
6 min read
The adaptive threshold that deleted the thing we were looking for
yanwang profile

The adaptive threshold that deleted the thing we were looking for

#javascript #webdev #algorithms #computervision
Comments 1
5 min read
Three things that bit us moving a document scanner fully into the browser
yanwang profile

Three things that bit us moving a document scanner fully into the browser

#javascript #webdev #privacy #performance
Comments 3
6 min read
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