Choose the DJVU file that you want to convert. Email when done? Drop your files to convert them. File Size Warning. You are attempting to upload a file that exceeds our 50MB free limit. No, thanks Continue uploading file. Files to Convert. File Name File Size Progress. Documents created using Digital to DjVu offer maximum portability across networks, since they do not depend on any installed font packages. How DjVu differs from other technologies File size and image quality are the perennially opposing forces in digital documents.
Limitations of Common Compression Technologies Documents are composed of many different elements including text, images, printed textures and background colors. How DjVu differs from other technologies DjVu starts by segmenting a page into layers: Foreground Layer — The foreground layer includes text, line art and other thin, low-color page elements.
Background Layer — The background layer includes photos, graphics, tint, and paper texture. Areas of the background covered by foreground components are smoothly interpolated so as to minimize their coding cost.
Resulting compression ratios are often in excess of Since multiple pages by default, 20 are considered together during this clustering, compression ratios increase with longer documents.
Background Compression For standalone photos or for background layers of compound documents, DjVu uses IW44 compression. Efficient Universal Web Viewing From the beginning, one of the goals in creating DjVu was to deliver a technology platform that would make it as easy to browse scanned documents as it is to browse HTML. Progressive Download and Display — A DjVu document is organized in such a way that the plug-in can immediately begin displaying the text of the first page, then progressively refine the view by adding foreground color and background color, until all the data chunks have arrived.
When you navigate to one of these pages, viewing is instantaneous. With this approach, DjVu documents as long as several thousand pages can be efficiently accessed over the Internet or any other network. Full Hyperlink Support — Viewers may not even realize it when their browser takes them to a DjVu document. Also, embedding hyperlinks in DjVu documents is easy.
This approach has several advantages including: Speed — Producing DjVu documents in this manner is several times faster than going through a full bitmap rendering. Memory Efficiency — There is never a need to render the page into a full-color raster image. Rasterization is slow and inefficient because it entails converting each page to a raster image, typically at 25 MB per page. No OCR Needed — Text information can usually be captured directly as foreground and background layers are being built, so no OCR is needed, and the hidden text layer is extremely accurate.
Hyperlink Extractions — Depending on source document type, hyperlinks can usually be captured as well and inserted in the resulting DjVu document. We remove all your data from our servers shortly after the process has finished.
We will not share it and do not even look at it. We are proud to offer a one-off solution to convert between DjVu and PDF, which is setting standards. Also, the inventors of the DjVu format recommend your service see DjVu. All our competitors skip this useful information, which leads to a poor user-experience when reading the resulting PDFs. We regularly invest in upgrading our conversion servers. That is why our service will also stay user-friendly and competitive in the future.
Conversion usually takes less than a minute. You can also convert DjVu documents with thousands of pages within a short time frame. Due to the modern infrastructure, we allow you to submit DjVu files of arbitrary file size. All data processing takes place entirely on our servers, and therefore it is independent of your local operating system. No matter if you use Windows, Linux, or Mac OS: You can use our tool from your web-browser and will receive an excellent result for free.
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