Cambridge recommends that authors have their manuscripts checked by an English language native speaker before submission; this will ensure that submissions are judged at peer review exclusively on academic merit. We list below a number of third-party services specialising in language editing and / or translation, and suggest that authors contact as appropriate.

AH Editing
Specialises in providing editing and copywriting across all major academic fields to Asia’s leading academic institutions
http://www.ahediting.com/ (English, Chinese and Japanese languages)

AmEditor
A US-based scientific and medical editing company
http://www.ameditor.com/ (English language only)

American Journal Experts
Provides English editing, translation, and peer review services in all major academic fields
http://www.journalexperts.com/?t=1363358288 (English, Spanish, Portuguese and Chinese languages)

Bioedit Ltd
An English editing and proofreading service for bioscience/biomedical researchers
http://www.bioedit.co.uk/ (English language only)

Bioscience Editing Solutions
Offers scientific editing and translation services for the international community
http://www.bioscienceeditingsolutions.com/ (English, Spanish, Italian, Chinese, Japanese and Korean languages)

BioScience Writers
Specialises in assisting English- and non-native English-speaking authors with the preparation of documents for publication in top academic journals
http://www.biosciencewriters.com/ScientificEditing.aspx (English language only)

Blue Pencil Science
A scientific and medical editing firm offering services from simple proofreading to extensive copyediting to help researchers communicate their findings effectively
http://www.bluepencilscience.com/ (English language only)

Boston BioEdit
Provides an English language editing service for biological scientists
http://www.bostonbioedit.com/ (English and Japanese languages)

Cambridge Academic Manuscripts
An English language editing service for biology, bioscience and medical research papers and related documents
http://www.cambridgeacademicmanuscripts.com/ (English and Japanese languages)

Cambridge Language Consultants
Services in English editing, proofreading, and consulting in logic and the flow of argument for manuscripts in the sciences, social sciences, and humanities
http://www.camlang.com/ (English language only)

Clark Scientific
A UK-based consultancy offering an expert scientific editing service
http://www.clarkscientificediting.com/ (English language only)

Edanz
An English language editing service for science and medicine, also offering journal selection, cover letter development, expert scientific review and abstract development
http://www.edanzediting.com/ (English, Chinese and Japanese languages)

Editage
A provider of specialist English-language editing and publication support services to researchers, journals, publishers, pharmaceutical companies, and corporations worldwide
http://www.editage.com/ (English, German, Italian, Portuguese, Turkish, Arabic, Chinese, Japanese, Korean and Taiwanese languages)

ELSS
Improves the quality and publication success of scientific research writing and other technical communication through teaching, consulting, and provision of high quality editing, dictation, and translation services
http://elss.co.jp/en/ (English and Japanese languages)

Enago
Provides English editing services in all major academic fields for ESL authors/researchers intending to publish in international peer-reviewed English journals
http://www.enago.com/ (English, German, Italian, Portuguese, Turkish, Arabic, Persian, Russian, Chinese, Japanese, Korean and Taiwanese languages)

International Science Editing
Offers a language and copyediting service to all scientists who want to publish their manuscript in scientific peer-reviewed periodicals and books
http://www.internationalscienceediting.com/ (English, Chinese and Japanese languages)

Journal Prep
Services to help researchers in any discipline prepare publication-ready research papers and competitive grant applications
http://www.journalprep.com/en/index.php (English, Bulgarian, Polish, Spanish, Portuguese, Finnish and Chinese lanuages)

The Medical Editor
Medical and scientific editing for physicians, scientists, publishers, and industry around the world
http://www.themedicaleditor.com/ (English language only)

OnLine English
Offers scientific and academic editing and specialises in providing an English correction and improvement service for authors whose native language is not English
https://www.oleng.com.au/ (English, German, French, Spanish, Italian, Chinese, Japanese, Korean and Taiwanese languages)

Rescript
Scientific editing services for plant science research
http://www.rescript.co.nz/ (English language only)

ScienceDocs
An integrated network of scientists and professionals dedicated to providing the highest quality research support services in the world
http://www.sciencedocs.com/ (English, Italian, Portuguese, Spanish and Chinese languages)

Society for Editors and Proofreaders (SfEP)
A UK-based membership organisation for editors and proofreaders, offering services to individual authors, publishers, companies, government agencies and other bodies
http://www.sfep.org.uk/ (English language only)

SciTechEdit International
Provides prepublication services, including editing, polishing, proofreading, and translation, for scientific manuscripts, with expert editors for all scientific and medical fields, including medicine, biology, chemistry, life sciences, physics, and technology
http://www.scitechedit.com (English, Chinese, Japanese and Korean languages)

Spi
Offers professional editing services to authors of journal articles in the areas of science, technology, medicine or the social sciences
http://www.prof-editing.com/ (English language only)

Stallard Scientific Editing
Provides a quality English-editing service for researchers, academics, and businesses worldwide
http://www.stallardediting.com/ (English, Chinese, Japanese, Korean and Spanish languages)

Write Science Right
Scientific editing & translation services including three levels of editing, follow-up editing, full translation, figure and table production/revision, writing and consulting
http://www.writescienceright.com/ (English, Chinese, Japanese, French, Italian, Portuguese and Spanish languages)

Disclaimer: Any language service work entered in to by one of the above services constitutes an agreement between the corresponding author and service; Cambridge, individual journals or their representatives cannot be held responsible for any aspect of the service provided, and are unable to enter in to discussion related to the language editing of individual manuscripts.