DataDoc Studio
PDF · Image · CSV · JSON — in your browser
Files never leave your device

Merge PDF files online, free

Combine multiple PDFs into a single document in seconds. Drag to reorder, then download — 100% private, right in your browser.

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Merge PDFs
Combine multiple PDFs into one. Reorder before merging.
No files yet — add 2 or more PDFs
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Free, private document & data tools — no upload required

DataDoc Studio is a complete online toolkit to edit PDFs, convert images, and transform CSV & JSON files. Everything runs locally in your browser, so it is fast, works offline once loaded, and keeps your files 100% private.

Edit & organize PDFs

Merge PDF, split PDF, compress PDF, rotate, crop and delete pages. Add watermarks, page numbers, and fill interactive PDF forms in seconds.

Sign & redact PDFs

Draw, type or upload an e-signature to sign contracts, and permanently black out sensitive information with the redaction tool.

Convert PDFs & images

Turn PDF to JPG, convert JPG/PNG images to PDF, scan photos to PDF, and extract text or export a searchable OCR PDF in multiple languages.

Clean & convert CSV

Open huge CSV files instantly, remove duplicate rows, trim whitespace, and convert CSV to JSON, SQL or Markdown tables.

Format & validate JSON

Beautify, minify and validate JSON with a live tree viewer, flatten nested data, convert JSON to CSV, and diff two payloads.

Edit images

Crop, rotate, resize and apply filters, then export to PNG, JPG or WebP — a quick free image editor right in your browser.

Frequently asked questions