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ICO to DJVU Converter

Turn ICO into DJVU format online — free and easy

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Beyond Icons

Extract the artwork from ICO containers and convert to DJVU — making your icon imagery usable in design projects, documents, and web content.

Straightforward Steps

No learning curve — upload your ICO file, pick DJVU as output, and download. The entire process is designed for simplicity.

Runs in the Cloud

All processing for ICO to DJVU happens remotely on Convertio servers, keeping your own hardware free for other tasks.

How to convert ICO to DJVU

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose djvu or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your djvu file right afterwards

About formats

ICO is the icon file format for Microsoft Windows, introduced with Windows 1.0 in 1985 and serving as the standard container for application icons, file type icons, and shortcut icons throughout the Windows ecosystem. An ICO file bundles multiple image variants within a single container — each at different sizes (16x16, 32x32, 48x48, 256x256, and others) and color depths (4-bit, 8-bit, 24-bit, 32-bit with alpha) — allowing Windows to select the most appropriate image for each display context, from tiny taskbar buttons to large desktop icons. The container structure consists of an ICONDIR header, an array of ICONDIRENTRY records describing each variant, and the image data itself. Since Windows Vista, ICO files support embedded PNG-compressed images for the larger sizes (typically 256x256), dramatically reducing file size while maintaining quality with full alpha transparency. One advantage is automatic size adaptation — Windows pulls the optimal resolution from the ICO container for each context (Explorer list view, desktop tile, Alt-Tab preview), ensuring crisp display without the application managing separate image files. The format's operating system-level integration is another core strength: ICO files serve as the identity mechanism for executables, file associations, and shortcuts across all Windows versions, and web browsers use favicon.ico for website identity in tabs and bookmarks. ICO creation and editing is supported by image editors like GIMP, Inkscape, and dedicated icon tools, and the format remains essential for Windows application development.
Developer: Microsoft
Initial release: 1985
DjVu (pronounced "deja vu") is a document format developed at AT&T Labs by Yann LeCun, Leon Bottou, Patrick Haffner, and Paul Howard, first released in 1996. The format was specifically designed for storing scanned documents and images at very high compression ratios while maintaining visual quality suitable for on-screen reading. DjVu achieves this through a layered approach: the document image is separated into a foreground layer (text and line art at full resolution), a background layer (photographs and textures at reduced resolution), and a mask layer that determines which layer is visible at each pixel. This separation, combined with purpose-built compression algorithms for each layer type, typically produces files 5-10 times smaller than equivalent JPEG or PDF scans. One advantage is exceptional compression on scanned pages — a 300 DPI color scan that might occupy 25 MB as TIFF or 500 KB as JPEG typically compresses to 40-80 KB in DjVu while preserving legible text. The progressive rendering model is another strength: DjVu files stream efficiently over networks, displaying a readable low-resolution version almost immediately while progressively refining to full quality. The format supports multi-page documents, embedded text layers for searchability, hyperlinks, annotations, and a shared dictionary mechanism that further compresses collections of similar pages. DjVu is widely used by libraries and archives for digitized historical documents and manuscripts.
Developer: AT&T Labs
Initial release: 1996

Frequently Asked Questions

Why convert ICO to DJVU?

DjVu provides high compression for your icon as a document — ideal when icon images need to be part of a compact digital archive.

What programs open DJVU files?

DJVU files work with DjView, Sumatra PDF, Evince, WinDjView. Check your operating system for built-in viewer support as well.

Does this work on mobile devices?

Yes — the ICO to DJVU converter works in any mobile browser on iOS and Android. No app installation is needed — just open convertio.tools and upload your file.

How long does ICO to DJVU conversion take?

Most conversions complete within seconds. Processing time depends on file size and server load, but the entire workflow typically finishes in under a minute.

Is batch ICO to DJVU conversion available?

Absolutely — upload multiple ICO files simultaneously and convert them all to DJVU at once. Batch mode saves considerable time on repetitive conversions.

Can I convert ICO to DJVU for free?

Yes — Convertio offers free ICO to DJVU conversion. For professional volumes and larger files, premium plans provide expanded limits and priority processing.