HumanPen vs Paperpal: does Paperpal have a humanizer?
Paperpal calls its rewriting tool AI Paraphraser and puts it inside Word, Google Docs and Overleaf, next to grammar, plagiarism and AI detection. HumanPen processes a finished document file and hands it back.
Competitor details verified 2026-09-11. Their own site is the authority.
The short answer
Paperpal is an academic writing suite (grammar, plagiarism and AI checks, reference checks, citation formatting), and its rewriting tool, AI Paraphraser, works inside Word, Google Docs, Chrome, Overleaf and on the web. It suits you while you're still drafting and want help in the editor. HumanPen picks up once the English .docx or .pptx is finished: it rewrites inside the file, can follow a Turnitin or iThenticate report, and hands the file back.
Side by side
| HumanPen | Paperpal | |
|---|---|---|
| Input | Upload the document itself | Paste or select text in its editor (web, Word, Google Docs, Chrome, Overleaf); the paraphraser page has no file upload |
| Output | The same file back, still editable | Rewritten in place in the editor; its pricing table lists 'Export document' (docx and pdf), but which plans include it isn't shown in text |
| Per-request word cap | None | Not stated |
| Detection report import | Turnitin / iThenticate, flagged passages only | Not stated |
| Word-count control | Set a target word range; output converges on it, slight drift possible | Trim cuts up to 35% of the word count (three Trim options); no target range seen |
| Billing | Metered credits, never expire | Monthly or annual subscription (Prime also sold as a 2- or 3-year one-off); rewriting counted in uses, with Paraphrase, Trim, Translate and AI Review listed together: Free 5 a day, Prime 500 a month, Pro unlimited |
| Adjacent tools | Citation fix, condense, translate | Grammar, plagiarism check, AI detection, journal fit, reference check, citations, chat with papers, translation, agents, Illustrate |
| Agent / API integration | Skill, MCP, and REST API — callable from AI agents | No API docs on its public pages (only llms.txt files) |
| Rewrite languages | English only | 50+ (the FAQ on the same page says 30+) |
When to pick Paperpal
- You're still drafting and want to rewrite where you write. AI Paraphraser works in Word, Google Docs, Chrome and Overleaf, so you never leave the document. With HumanPen you upload a finished file and download it again.
- You want a full academic toolkit on one subscription: grammar, plagiarism check, AI detection, reference check and citation formatting (it lists APA, MLA and 10,000 styles). HumanPen has no grammar checker, plagiarism check or AI detector; for targeted rewriting you bring a Turnitin or iThenticate report.
- You write in a language other than English. Its paraphraser page says 50+ languages (the FAQ on the same page says 30+). HumanPen only works in English.
- You'd like a refund window. Its pricing FAQ says first-time subscribers are eligible for a refund if they cancel within 7 days (monthly) or 30 days (annual).
Editing while you write, or processing a finished file
Paperpal's Word add-in and its Google Docs and Overleaf integrations edit your document where it lives: you highlight a sentence, paragraph or section and rewrite it in place. That suits drafting. If your paper leans on footnotes and tables, try it on one such section first.
HumanPen starts once the document is finished. You upload the .docx or .pptx, choose the whole document, passages you pick, or the passages a Turnitin or iThenticate report flagged, and get back an editable file of the same type, designed to keep citations, tables and styles in place. If a recheck still flags something, bring the new report. Eligible passages can be re-run at no charge.
They handle length differently. Paperpal's Trim cuts the word count by up to 35%. HumanPen lets you set a target word range, and the output converges on it, with slight drift possible.
FAQ
Does Paperpal have a humanizer?
Not under that name. On its public pages Paperpal's rewriting tool is called AI Paraphraser, and its sitemap has no humanizer page (paperpal.com/tools/ai-humanizer returned a 404 on 11 September 2026). If you came looking for a Paperpal humanizer, AI Paraphraser is its rewriting tool.
Paperpal works inside Word. Is that not the same as uploading a .docx?
No. The add-in edits the document you have open while you work in it. HumanPen takes the finished file, rewrites it and sends back a file. Which suits you depends on whether you're still drafting or about to submit.
Which one is more effective at lowering AI scores?
We haven't tested the two side by side, so we don't have a number to give you. The most reliable comparison is to run your own file through each one.
What does Paperpal cost?
On 11 September 2026 its pricing page showed Prime at $25 a month and Pro at $59 a month on monthly billing, with annual plans on a limited-time Back To School sale. Check its page for the current price. HumanPen sells credits charged on the words actually rewritten, and they don't expire.
Compare the results on your own document
Use your signup credits to try a small selection of paragraphs. Upload a copy, then compare the returned file with the original.
Try it on your document