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MewixMewix

About Mewix

Most free online tools ask you to upload a file, wait while a server does the work, and then download the result. That is fine for a meme, but not for a passport scan, a signed contract, a payslip or a photo with your home location in its metadata. Mewix started from a simple question: how many of these everyday jobs can a modern browser do on its own?

The answer turned out to be “most of them”. Compressing and converting images, merging and splitting PDFs, generating QR codes and barcodes, picking colors, formatting JSON, counting words — all of it runs in the tab you already have open. Your file is read into memory on your device, processed there, and handed back to you as a download. It is never sent to us.

Who is behind it

Mewix is an independent project, built and maintained by a small team rather than a large company.

The site launched in late August 2026. New tools are added when they can be done properly in the browser; anything that would need a server to work well (OCR on large scans, AI upscaling, editing Word files) is deliberately left out rather than faked.

Reach us at hello@mewix.net.

How the tools work

  • Images are decoded and re-encoded with WebAssembly builds of the same codecs desktop apps use (MozJPEG, libwebp, libavif, OxiPNG). HEIC photos from iPhones are decoded in the browser too.
  • PDFs are read and rebuilt with pdf-lib and rendered to images with Mozilla’s PDF.js, the same engine Firefox uses to show PDFs.
  • QR codes and barcodes are drawn locally and can be scanned from your camera or a screenshot without the image leaving your device.
  • Text and developer tools are plain JavaScript running in the page. Hashes use your browser’s built-in Web Crypto API.

Because everything runs on your hardware, there are some honest limits: very large files can be slow on older phones, and the tools cap batch sizes (for example 10 images per compression run, or 5 PDFs per merge) so the tab doesn’t run out of memory.

What we collect

No accounts and no file uploads. We use Google Analytics to see which pages and tools are used, so we know what to improve. It records things like the page you opened and that a download happened — never the contents of your files, the text you paste or the passwords you generate. The details are in the privacy policy.

Get in touch

Found a bug, a wrong result, or a tool you wish existed? Send a note through the contact page. Real reports are the main way the tools get better.