Convert anything. Free & private.

Why Convertora?

Most online PDF tools upload your files to remote servers. That means your private documents pass through someone else's infrastructure — and you have no control over what happens next. They might be cached on disk, scanned for ad targeting, retained in backups, or — if the service is compromised — leaked. Convertora takes a different approach: every operation runs entirely in your browser using client-side JavaScript and WebAssembly. Your files are never uploaded, never stored, and never seen by anyone but you.

Whether you need to merge a stack of PDFs, split a long document into separate sections, compress a scan to fit under an email attachment limit, sign a contract, or convert between image formats like JPG, PNG, WebP, and AVIF — it all happens instantly, right on your device. No account needed, no file size caps, no watermarks, no daily limits.

How browser-based file processing works

When you open a Convertora tool, your browser downloads the JavaScript code for that specific tool. Once it's loaded, the page is fully self-contained — you could disconnect from the internet and the tool would keep working. When you drop a file in, the browser reads it into memory using the standard File API and hands it off to a processing function that runs inside the tab. The output is generated locally and offered to you as a download via a temporary blob URL that's revoked when you close the tab.

We use well-known open-source libraries — pdf-lib for PDF modification, PDF.js for rendering, Tesseract.js for OCR, jsPDF for generating PDFs from scratch, mammoth for Word documents, SheetJS for Excel, JSZip for archive formats — all running on your machine. You can verify that no upload happens by opening your browser's developer tools, switching to the Network tab, and watching what requests fire while you use the tool. The only network activity is the static page assets and (where applicable) Tesseract's language model on first use.

Common workflows

Convertora's 68 tools cover the file-handling tasks that come up in everyday work. A few examples of what people use it for:

• Receipt and expense reports — combine phone-captured receipts into a single PDF, compress the result for email, and add page numbers if you need them.
• Contract handling — merge a contract with its signed signature pages, watermark drafts as DRAFT, redact personal information before external sharing, and lock the final version with a password.
• Scan cleanup — rotate misaligned pages, crop excess margins, run OCR to make old scans searchable, and convert to PDF/A for archival.
• Image preparation — convert iPhone HEIC photos to JPG, resize and compress images for the web, remove backgrounds, and combine multiple images into one.
• Document conversion — turn Word documents into PDFs (and back), export Excel as PDF tables, render Markdown to printable form, extract data from PDF tables into Excel.

Frequently asked questions