Opportunity report

Exporting & migrating notes is brittle and error-prone

Users with large archives fear losing content when switching apps. Common fixes are multi-step exports (OneNote→Obsidian→target) or custom scripts against APIs, but these are fragile and time-consuming. There's demand for robust, well-documented migration tools that preserve formatting, attachments and properties.

Worth it score 80High confidence4 signals7 evidence
Persona
1 evidence
Long-time note archive owners and power-users migrating from legacy apps (Evernote, OneNote) who have thousands of notes and attachments.

I have more than 10,000 notes in my Evernote. Would like to seek advice here what is the best way to smoothly migrate to Notion without the risk of losing any notes in its original format.

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Pain
3 evidence
Migrating large note collections (OneNote, Evernote, Notion) is difficult: tools often lose formatting, attachments, or metadata; automated migration isn't reliable for hundreds/thousands of notes and manual migration is impractical.

There is no automated way of migration from OneNote to Trilium. Moving hundreds of thousands of notes from OneNote manually will takes months and is prone to errors.

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I migrated 9000 notes about 2 months ago and while most of it will migrate ok, there may be some formatting that will not cleanly migrate.

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+1 more evidence

I wrote a getting started guide on the Notion API... database rows will be represented as structured json and you can do with it whatever you want.

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Workaround
2 evidence
People export via intermediaries: export OneNote → Obsidian (markdown) → import into target app, use dedicated importers (enex2notion), or write scripts using Notion API/Pandoc; others accept imperfect formatting and clean up manually.

Use Obsidian first to export your OneNote to markdown files, then import those files into Trilium.

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The Notion API gives you structured json and you can automate exports via scripts and make.com.

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Desire
1 evidence
Reliable, lossless migration/export tools (markdown + attachments + metadata), or robust APIs/connectors that preserve structure and attachments without manual rework.

I want to discuss only the migration process... moving hundreds of thousands of notes from OneNote manually will takes months and is prone to errors.

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