What the Bulk Image Converter does
Select any number of images in any mix of formats — JPG, PNG, WebP, GIF, BMP, TIFF, AVIF, HEIC, ICO, SVG — pick one output format and quality, and download every converted file in a single ZIP. It replaces running a single-format converter fifty times. Each image is decoded and re-encoded in your browser, so a folder of private photos stays on your device.
Supported formats
| Direction | Formats |
|---|---|
| Input | JPG, PNG, WebP, GIF (first frame), BMP, TIFF, AVIF, HEIC/HEIF, ICO, SVG |
| Output | JPG, PNG, WebP |
Decoding uses the browser for common formats, a TIFF decoder for .tif files and a HEVC decoder for iPhone HEIC photos. AVIF input needs a browser that supports AVIF (Chrome, Firefox, Safari 16+).
Choosing the output format
- JPG — photographs, smallest files, no transparency. Quality 80–85 is visually lossless for most uses; 70 for web thumbnails.
- PNG — screenshots, logos, anything with transparency or sharp edges. Lossless; quality setting has no effect.
- WebP — 25–35% smaller than JPG at the same quality, supports transparency, works in every current browser. Best for websites; some older desktop software cannot open it.
Transparent areas become white when converting to JPG. Animated GIFs are flattened to their first frame — use the GIF tools for animation.
Common uses
- Converting a camera roll of HEIC photos to JPG for a Windows PC or an upload form.
- Preparing product photos as WebP for a website.
- Converting scanned TIFFs from an office scanner into JPGs that email can carry.
- Normalising a design hand-off — a folder of mixed PNG, SVG and WebP — to one format.
- Turning a batch of screenshots into compressed JPGs for a bug report.
Limits and performance
- Files are processed one after another; a hundred 12-megapixel photos take a minute or two on a laptop, longer on a phone.
- The ZIP is assembled in memory. Very large batches (several hundred large photos) may exceed a phone browser's memory — split them.
- Output files keep the original name with the new extension. Duplicate names get a numeric suffix.
- Metadata (EXIF, GPS) is not carried into the output — a privacy benefit for sharing, a loss if you need capture dates.
- Images are not resized. Use Bulk Image Resizer first if you also need smaller dimensions.
Frequently asked questions
Can I convert to formats other than JPG, PNG and WebP?
Not here. Browsers can only encode these three. For TIFF, BMP or ICO output, use the dedicated converters (Image to ICO, PNG to BMP) on this site.
Some files failed to convert.
The failure message names them. Common causes: a corrupt file, an unsupported variant (CMYK TIFF, 16-bit HEIC), or AVIF in a browser without AVIF support.
Are EXIF orientation tags applied?
Yes — photos are decoded upright, so a sideways phone photo comes out correctly rotated.
Is quality lost?
Only when the output is JPG or WebP (lossy). PNG output is lossless. Converting JPG to JPG re-encodes and loses a little; keep the originals.
Can I keep the folder structure?
No — the ZIP is flat. Files are named after the originals.
Are my images uploaded?
No. Decoding, encoding and zipping all happen in your browser.