Image Converter

An image converter changes a picture from one file format into another without changing what the picture shows. This one reads JPG, JFIF, PNG, WebP, AVIF, GIF, BMP, ICO, HEIC, TIFF, PSD, SVG, CR2, DNG and PDF files, and writes JPG, PNG, WebP, GIF, ICO, PDF or SVG. Drop in a pile of mixed formats and they all come back out in the one format you picked. Two targets work differently: PDF puts the images onto the pages of one PDF, and SVG traces each image into filled shapes. A PDF you drop in gives one image per page.

The format is read from the first bytes of each file rather than from its name, because files get misnamed constantly: a chat app saves a PNG under a .jpg name, a phone photo keeps its .jpg name while the data inside is still HEIC. A file the converter cannot decode gets an error saying so instead of failing with a shrug.

Convert as many files as you want in one pass. Files convert as soon as they are added, each finished row has its own download icon, and Download All in the list header packs the whole set into a single ZIP named after the target, such as converted-png.zip. Two files that would land on the same output name are numbered rather than overwriting each other.

Some conversions change the image, and it is worth knowing which before you download. JPG has no transparency, so transparent pixels are filled with white on the way out. GIF carries 256 colours per frame, so photographs and smooth gradients band. JPG and WebP are lossy and re-encode at the quality you choose, anywhere from 10 to 100 with 90 as the starting point. PNG output re-encodes the pixels losslessly, though any compression artefacts already baked into a JPEG source travel into the PNG with them.

Converting inside the JPEG family costs nothing, because nothing is re-encoded. JFIF is JPEG with a different extension, so a .jfif file converted to JPG is copied byte for byte and renamed, and the row under the file says so. Everything else is drawn onto a canvas and encoded fresh, which drops EXIF, GPS coordinates and colour profiles. Keep the original file if you need the camera metadata later.

Animation survives only when GIF is the target, and only in a browser with the ImageDecoder API, which today means Chrome and Edge. Elsewhere the first frame is converted and the row tells you the rest were dropped. An animated GIF or WebP turned into PNG, JPG or WebP always keeps the first frame alone. ICO is its own case: the converter builds a real multi-size icon file holding 16, 32, 48 and 256 px squares, so it works as a favicon, and you can untick any size you do not need. A picture that is not square gets stretched into squares, so crop it first if that matters. The ceiling on any input is 100 megapixels, a 10000 x 10000 photo, above which the file is refused rather than hanging the tab.

A worked example. Click JPG under Output format, leave Quality at 90 and drop logo.png at 1920 x 1080 with a transparent background. It converts straight away to logo.jpg at the same 1920 x 1080 pixels, the transparent background now white, and no EXIF. Drag Quality down to 70 and the file converts again, with the row's size line showing the new result. Switch Output format to ICO and every file in the list converts again, so logo.png now comes out as logo.ico carrying all four favicon sizes, stretched into squares because the logo is not square.

• All decoding and encoding runs client-side, using the browser's Canvas API and ImageDecoder, plus libheif compiled to WebAssembly for HEIC, small JavaScript decoders for TIFF, PSD and RAW files, pdf.js for PDF pages, pdf-lib for writing PDFs and imagetracerjs for SVG tracing. Images are not uploaded.
• The daily usage check sends only how many files converted, their combined size in bytes and the target format. File names and pixel data are never sent.
• Re-encoded files do not carry EXIF, GPS coordinates or colour profiles from the source. A JFIF to JPG rename is the exception and keeps them.
• Files the converter cannot read are refused with a message rather than being sent anywhere else to be processed.
• Results live in the tab's memory until you remove them, press Clear All or close the page. Nothing is stored on a server.
• After the page has loaded, conversions keep working with the network off. The HEIC, TIFF, PSD, SVG, RAW and PDF code, and the SVG tracer, are downloaded the first time a file needs them, so add one of those while online first.