DOI Extractor
Extract, clean and deduplicate DOIs from reference lists and flag malformed ones.
DOIs are found in plain text, doi: prefixes and doi.org links (including URL-encoded ones). Trailing punctuation is removed while balanced brackets, as in 10.1016/S0140-6736(20)30183-5, are kept. Everything runs in your browser.
Processing and privacy
Processing varies by tool. Check the instructions for local processing, server requests, external services and any file or request limits before entering sensitive information.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
Reference resources
- APA, DOI and PMID Reference
Reference checks and the differences between citation style and article identifiers.
How to use the DOI Extractor
Extract, clean and deduplicate DOIs from reference lists and flag malformed ones.
- 1 Paste your reference list, bibliography or any text.
- 2 Choose whether to remove duplicates and how to format the output.
- 3 Copy the DOIs or download them as TXT or CSV, and review any flagged lines.
Example and practical tips
“…Lancet. 2020;395:497-506. https://doi.org/10.1016/S0140-6736(20)30183-5.” gives 10.1016/S0140-6736(20)30183-5, keeping the brackets and dropping the final full stop.
Frequently asked questions
Are DOIs case-sensitive?
No. 10.1136/BMJ.N71 and 10.1136/bmj.n71 are the same DOI, so duplicates are matched without regard to case.
Why is a line flagged?
It mentions a DOI that could not be read, often because it was split across two lines or is missing the 10. prefix.
Practical guides
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How to Use DOI Extractor
Extract every DOI from a reference list or any text, strip trailing punctuation, remove duplicates, flag broken DOIs and export them as text or CSV.
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