BibTeX Cleaner: remove duplicates, merge entries, and tidy your .bib file

Paste your BibTeX, choose how duplicates should be identified, and clean the file in one click. The tool runs entirely in your browser: your bibliography never leaves your device.

BibTeX input .bib
0 characters
Paste your .bib content or load the example.
Duplicate detection
Cleaning options
Sort output
Ready. Paste BibTeX and press Clean.
Private by design. Your BibTeX is processed only in this browser. The cleaning engine is fetched when you press Clean, but your bibliography never leaves your device.

How to use the BibTeX Cleaner

  1. 1
    Paste your BibTeX Paste your .bib content into the input box, or load the example to see duplicate entries.
  2. 2
    Choose cleaning options Select how duplicates should be identified, whether to merge fields, and how to sort the final list.
  3. 3
    Clean and deduplicate Press Clean. The tool processes the entries locally and shows the cleaned BibTeX.
  4. 4
    Copy or download Copy the cleaned BibTeX to your clipboard or download it as a .bib file.

Special features

Smart duplicate detection Match entries by DOI, title, or author and year. Combine options to catch every duplicate.
Merge duplicates Keep the first entry and fill missing fields from duplicates, so no information is lost.
Field cleanup Remove duplicate fields within an entry, such as repeated author or title fields.
Sort options Sort the final list by citation key, year, or author to keep your bibliography organized.
100% private No upload, no account, no analytics, no cookies, no localStorage. Your data stays in the browser from start to finish.
Safe rendering All output is treated as plain text and rendered safely. No raw HTML is injected into the page.

Frequently asked questions

Is this BibTeX cleaner free?

Yes. The BlowFix BibTeX Cleaner is completely free, with no account, no signup, and no usage limit.

How are duplicates identified?

You can choose to compare entries by DOI, by title, or by author and year. The tool supports any combination of these options.

Can I merge duplicate entries?

Yes. When merging is enabled, the tool keeps the first entry and fills any missing fields from the duplicate entries.

Is my BibTeX safe?

Yes. Your BibTeX is processed entirely in your browser. It is never uploaded, stored, or sent anywhere. The tool does not use cookies, analytics, or localStorage.

Does the tool work offline?

After the page and the processing engine have loaded once, cleaning runs locally in your browser. The first clean requires a connection to download the engine file.