About ConvertSafe

ConvertSafe started because of a simple frustration: every time I needed to convert a file, the only options were sites that uploaded my data to their servers. For a quick PNG-to-JPG, that felt like overkill. For anything with sensitive data (financial CSVs, client documents, personal photos), it felt wrong.

So I built ConvertSafe. Every conversion runs entirely in your browser using JavaScript, the Canvas API, and WebAssembly. Your files never leave your device. There is no server-side processing, no temporary storage, no "we delete your files after 24 hours" promise you have to trust.

You can verify this yourself: open your browser's DevTools, switch to the Network tab, and run any conversion. You will see zero outbound file transfers. That is proof, not a promise.

Privacy first

Files never leave your device. Zero server uploads.

Open technology

Built with Canvas API, WebAssembly, and standard browser APIs.

No tracking

No cookies, no fingerprinting, no ad networks.

How it works

When you drop a file into ConvertSafe, your browser reads the file into memory using the File API. From that point, the conversion happens entirely within your browser tab:

  • Image conversions (JPG, PNG, WebP, AVIF, HEIC, SVG, BMP, GIF, TIFF, ICO): We draw the source image onto an HTML Canvas element and re-export it in the target format. For HEIC files from iPhones, we use the heic2any library to decode Apple's HEVC compression before rendering.
  • Data format conversions (CSV, JSON, XML, YAML, XLSX): We parse the input text or binary data in-browser and serialize it into the new format. For Excel (XLSX) files, we use SheetJS to read and write the Office Open XML format.
  • PDF conversions: We use pdf.js (the same library Firefox uses to render PDFs) to extract text or render pages as images. For creating PDFs, we use jsPDF.

All heavy libraries are loaded on demand. When you visit a converter page, only the library needed for that specific conversion is downloaded. This keeps the initial page load fast while still supporting a wide range of formats.

Verify it yourself

We don't ask you to take our word for it. Here's how to confirm that ConvertSafe never uploads your files:

  1. Open any converter page (e.g., JPG to PNG)
  2. Open your browser's DevTools (F12 or Cmd+Option+I on Mac)
  3. Switch to the Network tab
  4. Drop a file and run the conversion
  5. Check the network log — you'll see zero outbound file transfers

The only network requests are for the page itself and analytics (we use Umami, a privacy-friendly, cookieless analytics tool that tracks page views without collecting personal data).

Privacy guarantees

ConvertSafe is built on four privacy principles:

No server uploads

Your files are processed entirely in your browser tab. No data is sent to any server, ever. This is architecturally enforced — there is no backend upload endpoint.

No tracking cookies

We use Umami for analytics, which is cookieless and GDPR-compliant by default. No fingerprinting, no ad networks, no third-party trackers.

No account required

You don't need to sign up, log in, or provide an email address. Just open a converter page and start converting.

Works offline

ConvertSafe uses a service worker to cache assets. Once you've visited a converter page, it works even without an internet connection.

Why not just use CloudConvert or Convertio?

Those are good tools for formats that genuinely need server processing (like video transcoding or OCR). But for the conversions ConvertSafe supports — images, data formats, documents — there is no reason your files need to touch someone else's server. The browser is more than capable of handling them locally. See our privacy comparison for a detailed breakdown of how ConvertSafe compares to other converters on privacy.

Supported formats

ConvertSafe currently supports 50+ conversions across three categories:

Contact

Questions, feedback, or bug reports: [email protected]

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