What is an DJVU file?

DJVU (DjVu Document) is a document formato used to store paginated text, com optional formatoting, tables, images, hyperlinks, headers e footers. It sits no documents & text family e is tipicamente associated com a specific office suite ou publishing pipeline that defined the formato e ships the canonical reader.

djvu

Formato de arquivo

Sobre os arquivos DJVU

Documento DjVu

Lançado em 1996 Por AT&T Bell Labs

Formato para documentos escaneados (1996), criado pela AT&T. Comprime documentos digitalizados melhor que PDF. Popular em arquivos digitalizados de bibliotecas e bibliotecas digitais.

Família

Documents & Text

Extensão

.djvu

Tipo MIME

image/vnd.djvu

Pode ser usado como

Entrada

A história

COMO NASCEU O
FORMATO DJVU.

DjVu — pronounced "déjà vu" — was developed at AT&T Labs in 1996 by Yann LeCun (later the inventor of modern convolutional neural networks), Léon Bottou, Patrick Haffner, and Paul Howard. The goal was extreme compression of scanned documents: take a 300 DPI color page scan that weighed 25 MB as TIFF, separate it into a foreground (text and line art) and background (photos and paper texture) using wavelets, and compress each layer aggressively. A typical scanned page dropped from 25 MB to under 50 KB while staying perfectly readable.

Internet Archive, Project Gutenberg, and library digitization projects adopted DjVu throughout the 2000s for millions of scanned books. Browser support was always via a plugin (the Caminova/LizardTech one), which meant the format struggled as the plugin era ended. Today DjVu\u2019s niche has mostly been filled by PDF/JBIG2, but you still find it anywhere scanned archives are kept — Wikipedia, Archive.org, and most academic library scans default to DjVu for the ratio.

CURIOSIDADES E
FATOS INTERESSANTES.

DjVu was co-invented by Yann LeCun, who later founded Meta AI Research and won the Turing Award for work on convolutional neural networks.

A typical 300 DPI color scan of a book page is 25 MB as TIFF, ~600 KB as PDF, and ~50 KB as DjVu at perceptually equal quality.

Archive.org's Open Library stores millions of scanned books with a DjVu version alongside the PDF.

The trick is layered wavelet compression: text and line art go in a foreground bitplane, photos and paper stain go in a low-res background, both recombine at display time.

Browser plugin support died with NPAPI around 2015 — which is why PDF won the scanned-document war despite being 5-10× larger.

VANTAGENS E
LIMITAÇÕES.

Vantagens

Extreme compression for scanned documents — typically 5-10× smaller than PDF.
Preserves OCR text layer alongside scanned image.
Mature archival format at Internet Archive, Wikipedia, academic libraries.
Separate foreground/background layers compress each content type optimally.

Limitações

No native browser support since the NPAPI era (~2015).
Tooling outside Linux is sparse.
Encoding requires the proprietary LizardTech/Caminova toolchain or djvulibre.
PDF/JBIG2 now covers most of DjVu's use cases with wider compatibility.

Tamanhos típicos de arquivo

Scanned page (B&W, text-only)

10-30 KB

Scanned page (color, illustrations)

40-150 KB

300-page scanned book

5-30 MB

Especificações técnicas

MIME type: image/vnd.djvu
Extensions: .djvu, .djv
Compression: Wavelet (IW44) + JB2 for line art
Invented at: AT&T Labs (1996)
Reference tool: djvulibre (open source)

CONVERTER A PARTIR DE
DJVU

djvu pdf djvu docx djvu odt djvu txt djvu md djvu html djvu epub djvu rst

Casos de uso comuns

Scanned document archives