Do I need to sign in to use these tools?

Every tool runs in your browser with no software to install. Some tools work right away; others — translation tools in particular — require signing in, which also unlocks your monthly free quota.

Are these tools free?

Yes. Belin Doc's online document tools are free to use, and translation tools include a monthly free quota once you sign in.

Are my uploaded files safe?

Files are transferred over an SSL/TLS-encrypted connection, used only for the current task, and cleared by an automatic deletion process afterward — no copies are kept.

Which file formats are supported?

PDF, Word, Excel, PPT, TXT, EPUB and images, plus video and subtitles. Translation tools include built-in OCR for scanned files and cover 100+ languages.

Which tool should I use?

To translate documents, use the Document Translator or the tool for your format; to compress, merge or split PDFs, use the matching PDF tool; to convert formats, use PDF to Markdown/EPUB and similar; to add subtitles or dubbing to video, use the video translation tools.

Tools

BelinDoc AI Toolbox

Your Smart Translation Tools Collection, One-stop Solution for AI Needs

Belin Doc offers 21 free online document tools in three groups: PDF processing (split, merge, compress, and format conversion), document translation (PDF, Word, Excel, PPT and more, with the original layout preserved), and video translation (subtitles and dubbing). Everything runs in your browser — no installation required.

PDF Tools

PDF Split

Split large PDF files into multiple smaller files for easier management and sharing.

PDF Merge

Combine multiple PDF files into one for easier management and sharing.

Compress PDF

Compress PDF files to reduce file size for easier storage and sharing.

PDF to Markdown

Convert PDF files to Markdown format for easier editing and publishing.

PDF to EPUB

Convert PDF files to EPUB format for better reading on e-readers and mobile devices.

EPUB to PDF

Turn any EPUB ebook into a clean, print-ready PDF.

PDF Flatten

Flatten PDF files by merging multiple layers into a single static layer.

Translation Tools

Video Translator

Free Video Translator. Intelligent Solution for Translation, Dubbing, and Subtitling.

Blueprint Translator

Engineering Drawing Translation · Preserving Layout and Precision

Manga Translator

AI Manga Translator · Perfectly Restoring Layout and Atmosphere

EPUB Translator

EPUB Translator · Smooth Reading Experience Like Original

Excel Translator

Translate Excel (.xlsx) files online while preserving formatting, formulas, and sheets.

PPT Translator

Translate PowerPoint slides online with layout and design preserved automatically.

Free PDF Translator

Translate PDF files online for free. No signup, no installation, supports scanned PDFs.

Text Translator

Translate plain text online for free with support for multiple languages.

Free Image Translator

Translate text in images online for free with OCR support and no signup.

Word Document Translator

Translate Word documents online for free with original formatting preserved.

Document Translator

One translator for PDF, Word, Excel, PPT, TXT and EPUB — original layout preserved.

Video Tools

Video Subtitle Translator

Translate your video's subtitles and embed or export them in 100+ languages.

Documentary Translator

Preserve narration style and cultural context for documentary films.

Interview & Podcast Translator

Multi-speaker detection and natural dialogue flow for interviews and podcasts.

Frequently asked questions

A few things worth knowing before you start.

Do I need to sign in to use these tools?: Every tool runs in your browser with no software to install. Some tools work right away; others — translation tools in particular — require signing in, which also unlocks your monthly free quota.
Are these tools free?: Yes. Belin Doc's online document tools are free to use, and translation tools include a monthly free quota once you sign in.
Are my uploaded files safe?: Files are transferred over an SSL/TLS-encrypted connection, used only for the current task, and cleared by an automatic deletion process afterward — no copies are kept.
Which file formats are supported?: PDF, Word, Excel, PPT, TXT, EPUB and images, plus video and subtitles. Translation tools include built-in OCR for scanned files and cover 100+ languages.
Which tool should I use?: To translate documents, use the Document Translator or the tool for your format; to compress, merge or split PDFs, use the matching PDF tool; to convert formats, use PDF to Markdown/EPUB and similar; to add subtitles or dubbing to video, use the video translation tools.