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Gemskills Converter is a free, browser-based checker for people moving their Gemini Gems to Skills before Google shuts Gems down on November 17, 2026.
Everything runs locally in your browser. The text you paste is processed by JavaScript on your own device. Nothing is uploaded to a server, logged, or shared with anyone. That matters if the Gem instructions you are checking contain commercial or confidential material.
Google announced that Gems will be discontinued for personal accounts on November 17, 2026, and that new Gems cannot be created or edited after October 13, 2026. The official migration path is a manual three-step process: download the files from your Gem, create a skill, paste the content back in.
That process is straightforward. What made it worth building a tool for was everything the official documentation does not make obvious:
name in the frontmatter does not match the parent directory, the skill uploads, appears in the list, and never fires. There is no error message anywhere.Each of those was found by reading the documentation and then testing against it, not from a single announcement. This tool exists to check for them before the deadline rather than after.
| It does | It does not |
|---|---|
Generates a compliant SKILL.md from Gem instructions you paste in |
Convert anything on Google's servers — that migration is automatic and free |
Validates an existing SKILL.md against the published spec |
Upload files to Gemini, Workspace, or any third-party service |
| Flags the rules that cause silent upload failures | Store, log, or transmit anything you paste |
| Explains what each rule means and how to fix it | Guarantee that Google will not change the format again |
Anyone with a personal Gemini account who created Gems and now has to move them. That includes people who used Gems for writing, research, data work, or as a packaged version of an existing prompt. You do not need to be a developer, and you do not need to understand YAML — the validator explains each rule in plain language.
| Part | What it uses |
|---|---|
| Pages | Static HTML with one shared stylesheet |
| Conversion and validation logic | A single JavaScript file, no framework, no build step |
| Hosting | Cloudflare Workers with static assets, deployed from GitHub on every push |
| Analytics | Google Analytics 4, loaded in your browser |
| Cost to you | Nothing. There is no account, no sign-up, and no paid tier |
There are no external dependencies, no tracking scripts other than Google Analytics, and no third-party JavaScript served from another domain. The validator is about 400 lines of plain JavaScript and you can read it all in assets/validator.js.
This tool is not affiliated with, endorsed by, or supported by Google. SKILL.md and Gemini Skills are features of Google products. Google can change the format or the migration rules at any time.
The validation rules were written against Google's published documentation as of October 2026. If the format changes, this tool will be out of date. Treat the output as a checklist, not as an authority.
What the validator can tell you is that a file matches the rules as they were documented. It cannot tell you whether Google will change those rules, whether your particular Gem will behave identically after conversion, or whether a skill that passes validation will be useful. Those are different questions.
The longer version is on the privacy policy page.
If something did not work as expected, or you hit a migration problem this tool did not catch, that is worth knowing — both for you and for anyone else reading the same documentation later. Use the address on the contact page.