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Benchmarks from the LensUp team: how our in-browser document scanner and tools measure up on public datasets and against other tools, misses included.

  1. Word and EPUB to Markdown: what four converters keep, feature by feature

    7 min read

    Footnotes, equations, images, a table inside a table: LensUp, Pandoc, markitdown and mammoth on the same DOCX and EPUB files, losses included.

  2. Make a PDF look scanned: four free tools, one test file

    3 min read

    Pages kept, no text left to select, still readable: we gave the same two-page PDF to four free scanned-look tools, LensUp included, and checked each file.

  3. Passport photo makers against the US rules: five free tools, two photos

    5 min read

    Head height, background, file type and size: we ran a close-up and a far photo through five free passport photo makers, LensUp included, and measured each file.

  4. Redact a PDF online: are the words really gone? Four tools tested

    5 min read

    A black box can leave the words in the file. We redacted the same contract and bank statement in LensUp, iLovePDF, Smallpdf and i2PDF and checked what was left.

  5. Hitting a KB limit, printing at 3.5 × 4.5 cm, copying an ID card: we measured nine online tools

    12 min read

    Compress to 100 KB, resize to 3.5 × 4.5 cm at 300 DPI, put an ID card on A4: LensUp and eight other free tools, measured file by file, misses included.

  6. How well does a browser scanner find the page? Our corner finder on 1,500 SmartDoc frames

    9 min read

    LensUp's page-corner finder on 1,500 SmartDoc 2015 frames, next to a textbook OpenCV method: where it finds the page, where it fails, raw results included.

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