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Proofreading, Editing and MTPE: Key Points for Buyers – COT Translation

Proofreading, Editing and MTPE: What Buyers Should Know

Professional translation of company, financial and technical documents

Last updated: 21 October 2026 · Written and reviewed by: the editing and quality team at COT – Consulting Office for Translation, certified translation since 1992

Proofreading, editing and MTPE (machine translation post-editing) are three different services, and mixing them up is a common reason for disappointing results. In short: editing improves the text, proofreading polishes the final version, and MTPE corrects text produced by a machine. Knowing which one you need saves time and money.

What is editing?

Editing compares the translation with the source text and improves accuracy, terminology, clarity and tone. It is the right choice when a translation already exists but you are not sure it is reliable, for example a contract or technical manual translated in-house.

What is proofreading?

Proofreading is the final check before publishing or printing. The proofreader looks for spelling, grammar, punctuation, formatting and consistency errors. It does not usually re-translate. Our proofreading and editing service and the page on translation and proofreading give more detail.

What is MTPE?

MTPE means a human linguist reviews and corrects a machine-translated draft. It can suit large volumes of low-risk content, such as internal documents. For legal, medical or official documents, a full human translation is normally the safer route.

Which service do you need?

SituationSuggested service
No translation yet, official documentCertified human translation
Translation exists, quality unknownEditing
Final text ready to print or publishProofreading
Large volume of internal, low-risk textMTPE, with clear quality level

Questions to ask before you order

  1. Is the work done by a human linguist with experience in my subject?
  2. What exactly is included: terminology check, formatting, a second review?
  3. How are changes shown so I can follow them?
  4. What is the timeline and cost basis (per word or per page)?

For the wider picture, read 7 steps to receiving accurate translations and how to be sure your document is well translated.

Frequently asked questions

Can proofreading fix a poor translation?

Not fully. Proofreading catches surface errors. If meaning is wrong, you need editing or a new translation.

Is MTPE cheaper?

Often, but the saving depends on the quality of the machine draft and the level of finish you need.

Is MTPE suitable for certified documents?

We advise a full human translation for documents submitted to embassies, courts or universities.

Can you edit a translation that someone else did?

Yes. Send the source and the translation so the reviewer can compare them.

Talk to us

Note: This article is general information as of the date above. The right service depends on your document and the receiving organisation.