Convert OBML to HTML

A page available only as an Opera Mini cache or offline snapshot may need conversion so it can be opened, edited, or archived in ordinary browsers. HTML is the practical target, but OBML conversion depends on the Opera Mini version that created the file.

What the OBML format is

OBML means Opera Binary Markup Language. Opera Mini used this proprietary binary format for pages processed through its proxy servers; OBML files can occur in Opera Mini application data, caches, backups, and forensic extractions.

OBML is not HTML with a different extension. Several format revisions correspond to different Opera Mini releases, and a file may contain a rendered page fragment, cached resources, or browser-specific metadata rather than the original document. Do not simply rename .obml to .html.

What the HTML format is

HTML is text-based markup that web browsers can display and that editors, search tools, and publishing systems can process. An HTML file can be stored with related CSS, image, font, and script files, making it more portable than an Opera Mini cache record.

A successful conversion may reproduce the cached page's visible structure without restoring the original source code, scripts, styles, remote resources, or server-side behavior.

How to convert an OBML file

1. Copy the file to a separate working directory and preserve the original. Do not modify files inside the Opera Mini application data directory.
2. Determine the Opera Mini version, platform, or backup source that produced the file. Parser compatibility varies by OBML revision; a parser that supports one revision may reject another or produce incomplete output.
3. Use a maintained, documented open-source OBML parser or OBML-to-HTML utility whose repository identifies support for that revision. There is no universal OBML command-line syntax, so use the project's README for its executable, options, and input requirements.
4. Write generated files to a new directory. A parser may use a command similar to parser input.obml > output.html, but the actual command and flags must come from the selected project's documentation. Some tools export images or other resources separately.
5. Open the generated output.html in a browser and test text encoding, links, images, layout, and resource paths. Keep any exported asset directory beside the HTML file and do not flatten or rename it unless the HTML references are updated.
6. If no parser supports the file, retrieve the page from its original URL and use the browser's Save page as → Web page, complete option. This creates a new snapshot from the live page; it is not a conversion of the OBML data and cannot recover pages that are offline, removed, private, or changed.

No reputable general-purpose online converter reliably supports all OBML revisions, and there is no standard desktop application that can be recommended for every file. Avoid uploading OBML files to unverified services: browser caches and backups can contain private page content, browsing history, tokens, or restricted data.

Quality and compatibility limitations

OBML is a compact, rendered representation rather than a guaranteed copy of the original HTML. Conversion can lose CSS declarations, JavaScript, forms, comments, document metadata, fonts, video, images, and resources that were not cached. Pages generated dynamically or transformed by Opera Mini's proxy may be especially incomplete.

If the result contains only text and visual layout, treat it as an archival snapshot rather than recoverable website source. For preservation, retain the original OBML file, converted HTML, exported assets, originating Opera Mini version, and original URL when available.