DeepSeek paragraph rewriter

The DeepSeek paragraph rewriter is one call to a rewriting model, carrying your text and up to 300 characters of instruction, returning one completion. The system prompt is fixed and worth reading before you judge any output against it: rewrite the supplied text to accomplish the transformation implied by the tool name while preserving the original meaning and factual claims, and return only the rewritten text with no preamble, commentary, quotation marks or markdown fence.

Two things follow. The output is the paragraph and nothing else, which makes it directly pasteable. And there is exactly one of it. Tools in this category that return several phrasings are running a different arrangement; here, plurality is something you request inside the run rather than a feature that produces it.

The analysis is in step two, and the verification in step three is not optional on anything with figures in it.

Step 1

Select a block with a single argument in it, up to 12,000 characters. Blocks that carry two arguments produce rewrites that dilute both.

Step 2

Specify the invariants in the instruction field: what survives verbatim, what shape the result takes, and what must not be strengthened.

Step 3

Compare against the source on facts first, then on the claim the paragraph makes, then on certainty words, then on sound.

The two ways to rewrite a paragraph carry very different risk profiles, and the riskier one is the one that looks safer. Substituting words leaves the sentence frame intact, which feels conservative, but the substitutions are exactly where meaning moves. As one guide on the subject puts it, "pure synonym swapping is where many meaning errors start", because "not every synonym is interchangeable. Some change formality, certainty, or emotional tone."

Changing structure looks more aggressive and is usually safer. Splitting a sentence, moving a subordinate clause to the front, converting a nominalisation back into a verb: none of those touch how certain the claim is or how technical the vocabulary remains. So the useful instruction is often the structural one. Split any sentence over 30 words and keep the vocabulary is a more conservative request than make this clearer, even though it sounds like the opposite.

The category standard is a set of named modes, two free and a dozen behind a subscription on the best known tool: Formal, Humanize, Academic, Simple, Creative, Expand, Shorten, Custom. Here there is a single instruction field of 300 characters, appended to the system prompt. It is strictly more expressive, and strictly more work.

It expresses any mode

Formal, simple, shorter and expanded are all one-clause instructions. None of them is a paid feature here.

It expresses conjunctions of modes

Simpler for a general reader, but keep the three defined terms verbatim. No menu encodes that.

It expresses prohibitions

Do not strengthen any claim. Do not add examples. A menu offers transformations and never restrictions.

It expresses scope

Rewrite the second and third paragraphs only. A mode applies to everything you paste.

It fails silently when vague

This is the cost. Make it better is a valid instruction and a wasted run, where a mode button at least does something defined.

Preservation of meaning is instructed, not guaranteed, and the failures cluster. Knowing the categories makes checking fast rather than exhaustive.

Modality

May becomes will, can becomes does. The sentence gets cleaner and the claim gets bigger.

Evidential strength

Suggests becomes shows, is associated with becomes causes. The most consequential drift in technical and clinical writing.

Defined terms

A term the document defined gets replaced with a near synonym that the document did not define.

Quantifier scope

Most becomes typically, some users becomes users. Small edits that change who the sentence is about.

Dropped qualifications

A subordinate clause carrying an exception disappears because it made the sentence long. This is the one to look for in any rewrite that came back noticeably shorter.

Five runs per rolling 24 hours, returning individually. Input 1 to 12,000 characters after trimming. Instruction 300 characters. One completion per run, and the response length is capped, so a very large input can return truncated output. No account, no API, no paid tier.

The benchmark tool on this term advertises an unlimited number of paragraphs per day on its free plan, with two modes available and the rest paid, and states no input ceiling. That is a better fit for volume. The trade here is a larger unit of work and an unrestricted instruction on every run, which matters when the document has figures in it and does not matter at all when it does not.

A rewrite changes the expression, not the provenance. If a passage required attribution before, it requires the same attribution afterwards, and the fact that a tool performed the rewording changes nothing about that. Two of the pages read on this term raise the question and it deserves the same plain answer here.

We hold no similarity index, so we cannot tell you what a plagiarism service will report about a rewritten passage. We make no claim about AI detectors either, in any direction. Detection tools report signals rather than proof of authorship, we are affiliated with none of them, and no page can honestly promise you another company's verdict.

When the paragraph is wrong rather than badly expressed. A rewrite will make an incorrect claim read better, which is worse than leaving it visibly rough. When the text is confidential, because it goes to our server. And when the problem is that the paragraph should not exist, which a rewrite will never tell you.

It is the right operation when the content is settled, the audience has changed, and the obstacle is that you can no longer see your own sentences. That is a genuine limit of rereading your own writing, and one run with a precise instruction gets past it.