Convert a whole folder of images to one format at once
Bulk Format Convert takes a mixed pile of images — PNGs, JPGs, WebPs, and more — and turns every one of them into a single target format that you choose: PNG, JPG, or WebP. You select the whole set, pick the format you want them all to become, and the tool re-encodes each image and returns the entire batch as one .zip file. It is the fast way to standardize a messy folder so everything shares the same extension and behaves consistently wherever you use it.
The conversion runs entirely in your browser. Each image is decoded, redrawn onto a canvas, and re-exported in the target format using the Canvas API, then all the results are packaged together with JSZip. Nothing is uploaded to Pixohub or any server, so your images stay private on your own device. The tool is free, requires no signup, and sets no cap on how many files you convert — the only real constraints are your device's memory and processor, which matter mostly for very large batches.
Standardizing on one format is genuinely useful. A website or app that expects JPGs will choke on a stray HEIC or WebP; a design workflow may need everything as PNG to preserve transparency; a performance-focused site may want everything as WebP for the smallest files. Rather than converting pictures one at a time, you set the target once and the whole batch comes out uniform.
Choosing the right target format
PNG is lossless and supports transparency, which makes it the right choice for logos, icons, screenshots, and any graphic with sharp edges or a see-through background. The trade-off is larger files for photographic content, since PNG is not designed to squeeze detailed photos efficiently. If your batch is UI assets or line art that must stay crisp, PNG is usually the safe target.
JPG is the workhorse for photographs. It compresses rich, detailed images into small files and is supported absolutely everywhere, but it does not support transparency — any transparent areas are filled with a solid background — and it is lossy, so repeated conversions gradually soften an image. Convert to JPG when your batch is photos destined for the web or for sharing and you do not need transparency.
WebP is the modern option that often wins on both fronts: it typically produces smaller files than JPG at similar quality and, unlike JPG, it supports transparency like PNG. Nearly all current browsers display it, so it is an excellent target when your goal is fast-loading web images. The main reason to avoid it is compatibility with older software or platforms that still do not recognize the format, in which case JPG or PNG is the safer choice.
When batch conversion saves the day
A common scenario is a phone that saves photos as HEIC or a camera that shoots in a format some website refuses to accept — converting the whole folder to JPG makes the images universally usable in one pass. E-commerce sellers often need every product photo in the same format their platform requires, and bloggers increasingly convert entire image sets to WebP to keep pages fast and improve Core Web Vitals scores.
Designers and developers reach for batch conversion when a project standard calls for a single format across all assets, or when preparing a whole camera folder for the web. Because the tool applies one target format to everything and delivers a single zip, it turns what would be dozens of individual conversions into a couple of clicks. If you also need the images smaller or a different size, combine this with Bulk Image Compress and Bulk Image Resize to fully prepare a batch for publishing.