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Belin Doc vs Grammarly AI

Belin Doc is a web service that translates whole files (PDF, Word, PowerPoint, Excel, EPUB, images) into another language while keeping the original layout, and it also translates videos with subtitles and dubbing. Grammarly checks and rewrites English as you type. They don't do the same job: use Belin Doc to turn a Japanese PDF into an English one, and Grammarly to clean up the English you write yourself.

What Belin Doc gives you

You upload a file, choose the language pair and a model (the default is Gemini 2.5 Flash; ChatGPT, Claude and DeepSeek are also offered) and download a translated copy in the same format. The site claims more than 60 languages. The free plan is 500 pages a month, and free-tier PDFs carry a watermark.

Paid plans are one-time purchases rather than auto-renewing subscriptions: Pro is $19 for a month (5,000 pages) or $190 for a year, Max is $59 a month (10,000 pages) or $590 a year, and there are short Pro passes from $1.50 for a day. Page credit packs start at 800 pages for $4.90. There's also an API with key auth and an MCP server, which draw on the same page quota. The site doesn't say what company runs it.

Where Grammarly fits

Grammarly, now part of Superhuman, works in your browser (Chrome, Safari, Firefox, Edge), in Windows and Mac apps, in Word and Outlook, and as a keyboard on iPhone, iPad and Android. The free plan covers spelling, grammar and tone, plus 100 AI prompts a month. Pro adds sentence rewrites, plagiarism and AI-text detection and 2,000 prompts a month, at $12 a month billed annually ($144) or $30 paid month to month. Enterprise is sold through Superhuman.

If you need both

Translate with Belin Doc first, then paste the parts you'll send or publish into Grammarly to smooth the English. Grammarly won't preserve a PDF's tables or columns, and Belin Doc won't tell you a sentence reads badly.

Belin Doc: Pick Belin Doc if you have a paper, manual or slide deck in one language and need a copy in another with the layout intact.

Grammarly AI: Pick Grammarly if you write in English every day and want spelling, grammar and tone fixes inside the apps you already use.

Facts checked Oct 18, 2026 against 5 sources

Which one should you try?

Belin Doc

Freemium

Best for Students and researchers working with international documents

Visit Belin Doc See full review

Grammarly AI

Freemium

Best for Proofreading written content

Visit Grammarly AI See full review

Pricing, capabilities and platforms side by side. Prices are as of the "Pricing checked" date in the table.

Belin Doc

Belin Doc

The vendor describes Belin Doc as a document translation service focused on format preservation — meaning the translated output mirrors the original layout rather than stripping it to plain text. The free tier, which the docs confirm at 500 pages per month plus an optional daily quota, handles a realistic research or student workload without a credit card. For heavier volume, paid tiers and one-off credit packs fill the gap. The ceiling appears when documents contain highly complex mixed-language tables or custom fonts; community reports suggest those cases require manual cleanup post-export. Teams pushing multilingual document pipelines at scale will hit rate limits before building any real automation, since no API is available.

Grammarly AI

Grammarly AI

Grammarly sits in your browser and writing apps, flagging mistakes as you type—grammar, spelling, tone, clarity. It's useful if you write emails, documents, or social posts and want a second pair of eyes without leaving your workflow. The free tier covers basics; Premium ($12/month) adds tone detection and advanced rewrites. The catch: the free version is genuinely limited, and Premium's AI-powered suggestions sometimes miss context or feel prescriptive. It works best for high-stakes writing where accuracy matters more than speed.

AttributeBelin DocGrammarly AI
PricingFreemiumFreemium
PricePro $19/month or $190/year; Max $59/month or $590/year (one-time purchases, not subscriptions); passes from $1.50/day; free 500 pages/monthPro $12/mo billed annually ($144/yr) or $30 month to month
Pricing checkedOct 19, 2026Oct 19, 2026
Free trialNot statedNot stated
Open sourceNoNo
Has APIYesYes
Self-hosted optionNoNo
PlatformsWeb-based, browser-accessibleWindows, Mac, browser extensions (Chrome, Safari, Firefox, Edge), Microsoft Office, Google Docs, iPhone, iPad, Android
Languages—95+ languages
Released20252009
Pros
  • Format preservation on upload, so a two-column research paper or a table-heavy technical manual comes back in the same layout — not a wall of unsorted text you have to reformat before it is usable.
  • 500 pages per month on the free tier, confirmed in the vendor FAQ, which means a student or researcher translating one or two papers a week never hits a paywall for normal use.
  • Optional daily quota on the free tier gives consistent access spread across the month rather than a hard monthly cliff that cuts off mid-project.
  • Credit packs available outside subscriptions, so a team with a one-off contract needing 2,000 pages translated does not get locked into a recurring subscription to cover a temporary spike.
  • Covers high-stakes document types — certificates, legal filings, travel documents — where layout and field alignment carry legal or administrative weight, not just readability.
  • Real-time feedback
  • Grammar and spelling corrections
  • Integrated with popular platforms
Cons
  • No API exists, which means every translation is a manual upload. The moment your team needs to trigger translation from code — say, a document hits a SharePoint folder and you want the translated copy automatically — Belin Doc is a dead end and you are moving to a service like DeepL API or Google Cloud Translation.
  • Documents are processed on the vendor's cloud with no self-hosted option. Legal teams handling privileged communications or medical teams processing patient records will hit a compliance wall before they hit a page limit.
  • Format preservation breaks on highly complex PDFs — custom fonts, mixed-direction text, layered graphics. Those documents come back needing manual layout repair, at which point the time saved on translation is spent on cleanup.
  • No programmatic output means no downstream automation: the translated file lives in your downloads folder, not in a connected workflow. Teams building any kind of multilingual content pipeline will maintain a parallel manual step indefinitely.
  • Limited free tier accounts
  • Subscription required for advanced features

Made up your mind?

Belin Doc

Freemium

Best for Students and researchers working with international documents

Visit Belin Doc See full review

Grammarly AI

Freemium

Best for Proofreading written content

Visit Grammarly AI See full review

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Specs come from each tool's own site and docs (how we test). AIDiveForge is editorially independent.

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