Bulk Image Converter
Convert a whole folder of images between PNG, JPG and WebP in a single pass, without opening a paid tool. The browser handles each file locally, so even large batches stay fast and private. Filenames are preserved with the new extension, which keeps your folder structure clean and lets you diff or replace originals easily.
How to bulk convert images
- Drop your batch of images onto the tool, or click to select a folder of files.
- Pick the target format — WebP for web, PNG for lossless/transparent, JPG for smaller photos.
- If the target format has a quality slider, pick a level (75-85 is a reasonable default for lossy formats).
- Download each converted file individually, or grab the whole batch at once. Original files are left untouched.
Common use cases
- Migrating an existing image library to WebP to cut page weight on a heavy site.
- Normalising a mixed folder of HEIC, PNG and JPG camera exports into a single format for a design handover.
- Converting PNG screenshots to JPG before adding them to a long-form blog post where page size matters.
- Preparing assets in multiple formats for a CMS or framework that expects one specific extension.
Frequently asked questions
Does converting a JPG to PNG improve quality?
No. Converting from a lossy format (JPG) to a lossless one (PNG) preserves the current quality but cannot add detail that was already discarded. For best quality, go from lossless to lossless or start from the original RAW/PSD source.
What happens to transparency when I convert PNG to JPG?
JPG does not support transparency. Transparent pixels become white by default when converting to JPG. If transparency matters, convert to WebP instead.
Can I change dimensions while converting?
This tool focuses on format conversion. To also resize, use the bulk-resize tool first and then convert the resized batch.
Are my files uploaded to a server?
No. Every conversion happens on the browser Canvas locally. No file leaves your device and no copies are stored.
About bulk conversion
Different image formats serve different purposes — WebP for web performance, PNG for lossless UI assets and transparency, JPG for photos where file size matters more than pixel-perfect reproduction. Moving a library from one format to another (for example, converting a 500-image JPG catalogue to WebP for faster page loads) is tedious one file at a time. A batch converter applies the same format and quality to every file in a single browser session.
- Convert any batch to PNG, JPG or WebP
- Processes mixed input formats in the same run
- Keeps original filenames with the new extension
- Adjustable quality for lossy output formats
- Runs locally — handles large batches without uploads
- Your images never leave your device
Free. No signup. No file uploads. Ads via AdSense (consent required).
By Marco B. ·