Convert PNG to OTB
Convert PNG images to OTB in bulk without losing quality or installing any software. Fast, free and easy to use.
68+ input formats · 41 output formats · click, drop or paste
How it works
- 01
Upload your PNG file(s)
Click "Choose files" or drag your PNG images into the drop area. You can also paste them.
- 02
Pick the output
OTB is pre-selected. Open Settings to adjust quality or max size.
- 03
Start conversion
Hit Convert. Files process three at a time — most finish in well under a second.
- 04
Download
Download each file individually, or all of them together as a ZIP archive.
PNG vs OTB
Portable Network Graphics
Lossless with full transparency. Best for logos, screenshots, UI and anything with sharp edges.
On-the-air Bitmap
Nokia mobile-phone bitmap format.
Frequently asked questions
How do I convert PNG to OTB?+
Drop your PNG image(s) into the converter above, click Convert, then download the result individually or as a ZIP.
How do I convert PNG without losing quality?+
Open Settings and move the quality slider to 100. Lossless formats like PNG and TIFF always keep every pixel; WEBP and AVIF switch to lossless mode at 100.
Can I bulk convert PNG files?+
Yes. Select or drop as many PNG files as you like — they're converted in parallel and can be downloaded together as a ZIP.
Is this converter secure?+
Yes. Every file is converted entirely inside your browser and never uploaded to any server.
Can I edit images after converting?+
Yes — use our free Resize and Compress tools.
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