This OPML formatter is built for people who need readable outline XML without opening a desktop editor. Paste OPML into the page, use the beautify action, and turn a dense feed export or outline document into something you can scan, diff, and review safely.
Because OPML is often exchanged between RSS readers, podcast apps, and outline tools, formatting matters during migrations and troubleshooting. Clean indentation makes it easier to inspect nested nodes, attributes, and broken structure before you import or share the file.
Use this page when readability is the priority and you want to inspect structure before taking the next action. To extend the workflow after the initial result, pair it with OPML Minifier when that next step matches your job.
If you need a second validation step after the first run, compare the output with Html Minifier so you can keep the workflow inside the same browser session.
The formatter reorganizes the markup for readability without changing the intended document structure. In other words, it is for presentation and inspection, not for transforming the meaning of the outline.
That distinction matters when you are debugging imports. A properly formatted OPML file makes mismatched nesting, repeated attributes, and missing closures much easier to spot before the document is passed to another system.
If a podcast app exports all subscriptions on one long line, beautifying the OPML makes each nested outline element readable so you can verify that feeds and groups were exported correctly.
A team can paste an OPML outline into the formatter before a migration review so everyone can inspect the hierarchy, titles, and node attributes without manually reformatting it in an IDE.
This page is especially helpful when the primary intent is 'Online OPML Formatter' and you want the result to be immediately useful instead of theoretical. The controls exposed on the live page keep the workflow short, but the surrounding explanations help you decide when to trust the output, when to validate it again, and which follow-up tool or workflow makes the most sense next.
This page is especially helpful when the primary intent is 'Online OPML Formatter' and you want the result to be immediately useful instead of theoretical. The controls exposed on the live page keep the workflow short, but the surrounding explanations help you decide when to trust the output, when to validate it again, and which follow-up tool or workflow makes the most sense next.
It is used to beautify OPML so the XML structure is easier to read, review, and troubleshoot before import or export.
It should not change the intended outline data. The goal is to change presentation, such as indentation and spacing, so humans can read it more easily.
Readable markup helps you catch hierarchy problems, repeated entries, and malformed sections before they create issues inside a feed reader or outline tool.
Yes. The page exposes copy and download actions so you can reuse the formatted output immediately.
A common pattern is to beautify first for inspection, then move to compact output or another feed-processing step once you know the file is shaped correctly. If you are continuing the same task, PHP Minifier is a natural follow-up because it keeps the context close to the result you already have.
Program testing can be a very effective way to show the presence of bugs, but is hopelessly inadequate for showing their absence.