OPML Formatter Online Tool

Format OPML so feed lists and outlines are readable again

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.

Key Features

• Large code area for pasted OPML input.
• Sample, clear, download, and copy controls for quick testing.
• Beautify action focused on readable indentation and line breaks.
• Helpful for manual review before imports, exports, or source control diffs.
• Useful for both feed lists and generic outline-style OPML documents.

Use Cases

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.

• Review exported RSS subscription files before moving them into another reader.
• Clean up OPML copied from an API response or support ticket.
• Make nested outlines easier to audit when attributes are hard to follow in one line.
• Prepare files for diffing so structural changes are clearer in version control.

How To Use

1. Paste your OPML into the code box or load the sample to confirm the workflow.
2. Click Beautify to apply indentation and line breaks.
3. Review the formatted output for nesting, duplicate nodes, or malformed sections.
4. Copy or download the result when you are ready to save, import, or share it.

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.

How It Works

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.

Examples

Clean up a podcast subscription export

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.

Prepare an outline for review

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.

Edge Cases & Troubleshooting

• If the output still looks broken, the source may contain malformed XML or incomplete tags.
• Formatting improves readability, but it will not repair invalid semantics inside the document.
• If you plan to compare structural changes, keep one formatted style across the whole workflow.
• Use the clear action between files so nodes from different documents are not mixed by mistake.
• If you need compact output after review, run the cleaned file through a minifier as a separate step.

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.

FAQ

What is an OPML formatter used for?

It is used to beautify OPML so the XML structure is easier to read, review, and troubleshoot before import or export.

Does formatting change my OPML data?

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.

Why format OPML before importing it?

Readable markup helps you catch hierarchy problems, repeated entries, and malformed sections before they create issues inside a feed reader or outline tool.

Can I save the result after beautifying?

Yes. The page exposes copy and download actions so you can reuse the formatted output immediately.

Next Steps / Related Workflows

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.