Image Converter — convert JPG, PNG, WebP, JPEG XL, TIFF, GIF and PDF in your browser

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A converter that never uploads your pictures

Most online image converters work by sending your file to a server, converting it there and sending it back. This one does not have a server to send it to. The whole converter — every decoder, every encoder, the resizing and the ZIP packing — is compiled to WebAssembly and runs inside this browser tab, on your own machine. Open your browser's network panel and convert something: nothing leaves the page.

That is worth something for a holiday photo and it matters rather more for a scan of a passport, a contract or a medical image. It also means there is no queue, no upload wait on a slow connection, and no file size rule beyond what your own browser can hold.

What it converts

Twelve output formats

PNG, JPG, WebP, JPEG XL, TIFF, BMP, GIF, ICO, QOI, TGA, PPM and PDF. DDS and Radiance HDR can be read as well, though not written back.

Real JPEG XL support

Lossless and lossy, both ways. Unusual for a browser tool, because most browsers still cannot display JPEG XL at all — this app brings its own pure-Rust encoder and decoder, so it works anyway.

Rotate, mirror, resize

Quarter turns and a flip about either axis, and five ways to resize: by percentage, into a bounding box, by one edge with the other following, or to exact dimensions. The result size is shown before you commit to it.

Whole folders at once

Drop in as many files as you like, set the options once, convert them all and take the results away as a single ZIP. Mixed batches can keep each file in the format it arrived in.

Presets, or every knob

Eleven one-click presets — smallest lossless file, photo for a web page, small enough to email, icon, print and archive. Underneath them: quality, chroma subsampling, progressive scans, PNG row filters, resampling kernels.

Thirteen languages

English, German, Spanish, French, Portuguese, Italian, Russian, Ukrainian, Turkish, Polish, Czech, Slovak and Hungarian. It starts in whichever one your browser asks for.

How to use it

  1. Drop your images onto the app above, or click it to browse for them.
  2. Pick a preset, or choose an output format and open Settings for the rest.
  3. Press convert, then download the file — or the whole batch as one ZIP.

Questions

Are my images uploaded anywhere?
No. The converter runs inside the browser tab as WebAssembly. Decoding, resizing and encoding all happen on your device, and the file is never sent to a server.
Does it cost anything, or need an account?
No charge, no sign-up, no usage limit. The advertising on this page is what pays for hosting it.
Can it turn an image into a PDF?
Yes — a single-page PDF, with the picture placed at 150 dpi and scaled down to fit an A4 sheet if it would overflow one, so the page always keeps the image's own proportions. PDF is write-only here; reading one back would need a full page renderer.
Is there a file size limit?
No fixed limit — everything happens in your browser's memory, so very large images are bounded by the tab rather than by a rule. The app estimates the wait before you start and warns you when the settings and the pixel count add up to a long one.
Why is my JPEG XL file larger than the JPEG I started with?
Because a lossless JPEG XL has to preserve the JPEG's own compression artefacts as if they were detail. If you want a smaller file, use one of the lossy presets; at comparable quality JPEG XL is usually well below the JPEG.
Does it work offline?
Once the page has loaded, converting needs no further network access. The page itself is not installable as an offline app yet, so you do need to load it once.