Why this tool is useful
Prepare a smaller subscription file after combining backups from several readers, without granting a third-party service access to personal feed collections.
Local File Tools · runs locally
Private OPML Feed Deduplicator
Remove repeated feed subscriptions from an OPML export while retaining the first copy, category hierarchy, labels, site links and supported outline metadata.
Ready. Your working data stays in this browser.
Files and capture streams stay on this device. Processing uses browser APIs only; nothing is uploaded to YTSave, the media API or a proxy. No server copy is created, stored or left to delete. The file picker is cleared when processing starts, and disposable worker memory is destroyed after completion or cancellation. Preview and generated-output memory is released when you clear the tool or leave the page.
How it works
The first exact or conservatively normalized feed address wins; the browser writes a fresh escaped OPML 2.0 document from the retained local outline tree.
Practical example
Choose normalized matching to collapse fragment-only and campaign-only variants, verify the removal count, then download a category-preserving OPML import file.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.