Convertio gives you 2 free conversions per day. CloudConvert gives you 25 per month. If you need to convert 30 PNGs to JPG, both hit their limit before you finish.
The batch image converter free at Ultimate Tools has no conversion cap. Upload as many images as you need, pick the output format once, convert all of them, and download a ZIP with every converted file. No account, no upload to a server, no daily limit.
How to Convert Multiple Images at Once
Batch Convert tab:
- Open the Image Converter
- Click the Batch Convert tab
- Drag and drop your image files onto the drop zone — or click to browse
- Select the output format (JPG, PNG, WebP, or BMP)
- Click Convert All & Download ZIP
- A ZIP archive downloads with every converted file inside
The progress counter updates as each file converts. Duplicates (same filename + size) are automatically deduplicated — dropping the same folder twice won't double your files.
Single image tab:
The original Single Image tab is still there for one-off conversions with a live preview before download.
Supported Conversions
| From | To |
|---|---|
| PNG | JPG, WebP, BMP |
| JPG / JPEG | PNG, WebP, BMP |
| WebP | JPG, PNG, BMP |
| BMP | JPG, PNG, WebP |
| HEIC (where browser supports) | JPG, PNG |
The conversion uses the browser's Canvas API — the same engine browsers use to render images. Quality is lossless for PNG and lossless WebP outputs. For JPG, the output uses high quality (0.92 on a 0–1 scale).
When Batch Conversion Saves Real Time
Converting a product photo shoot. Photographers shoot in PNG or RAW-exported TIFF/PNG. E-commerce platforms want JPG. Drop 50 product shots in, select JPG, get the ZIP. No Photoshop batch action, no Lightroom export preset required.
Preparing images for a website. PNG screenshots and design exports are large. Converting to WebP reduces average file size by 25–35% vs JPG at equivalent quality — directly improving page load time. Select WebP, batch convert, done.
Stripping transparency for social media. Twitter, LinkedIn, and WhatsApp don't support PNG transparency properly. Convert your PNGs to JPG before uploading to avoid white or black background surprises.
Client asset delivery. A client needs all files in JPG format but your working files are WebP. Batch convert the entire folder in one pass rather than exporting each individually.
Legacy system compatibility. Some older CMSes, internal tools, and email clients don't handle WebP or PNG. BMP and JPG are universally supported. Batch convert to JPG for guaranteed compatibility.
Why Not Use Convertio or CloudConvert?
| Tool | Free limit | Account required |
|---|---|---|
| Convertio | 2 files/day | No (2 files), yes (more) |
| CloudConvert | 25 conversions/month | Yes |
| Squoosh | 1 image at a time | No |
| Ultimate Tools Image Converter | No limit | No |
Everything runs in your browser using Canvas API. Your images are never uploaded to any server — they're read locally and converted in memory.
Related Tools
- compress multiple images free batch download zip — after converting formats, reduce file sizes further — batch compress up to 20 images and download as a ZIP, no upload required
- batch watermark multiple images free no subscription — add your logo or text watermark to every converted image in one pass before delivering to clients
- resize image to exact dimensions online free — resize all images to a specific pixel size or social media preset after format conversion — same browser-only approach
