OTB to WEBP Converter

Seamless OTB to WEBP image conversion, done in the cloud

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Cross-Platform Access

Whether you are on a desktop, tablet, or phone — convert OTB to WEBP from any device with a modern web browser.

Browser-Based Tool

No software to download — convert OTB to WEBP entirely in your web browser. Works on any device with an internet connection.

Lightning Fast

OTB files are small and convert to WEBP in seconds. The cloud-based engine handles the transformation quickly so you can download right away.

How to convert OTB to WEBP

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose webp or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your webp file right afterwards

About formats

OTB (Over-the-Air Bitmap) is a monochrome image format developed by Nokia as part of their Smart Messaging specification in 1997, designed for transmitting small graphics — operator logos, group graphics, and picture messages — to Nokia mobile phones via SMS. OTB files contain 1-bit (black and white) images at small fixed resolutions, typically 72x14 pixels for operator logos and 72x28 pixels for group graphics, encoded in a compact binary format suitable for embedding within the payload of SMS text messages. The format uses a simple structure: a header byte indicating whether the image is an operator logo or group graphic, width and height values, and the raw bitmap data where each bit represents one pixel packed eight per byte. The extremely tight format — designed to fit within a single SMS message (140 bytes maximum payload, shared with addressing overhead) — reflects the severe constraints of mobile communication in the late 1990s. Nokia's Smart Messaging system was one of the first commercial implementations of rich content delivery to mobile phones, and OTB images represented the entire visual content capability of Nokia handsets before MMS and mobile data browsing arrived. One advantage is the format's historical role as a pioneer of mobile visual messaging: OTB images were among the first graphics that ordinary consumers could send to each other's phones, predating MMS, camera phones, and smartphones by nearly a decade. The format's minimal footprint is another characteristic — entire images fit in a few dozen bytes, reflecting an era of extreme bandwidth constraints. OTB files are supported by ImageMagick, various Nokia phone management tools, and specialty mobile format utilities.
Developer: Nokia
Initial release: 1997
WebP is an image format developed by Google, announced on September 30, 2010, designed to provide superior compression for web images in both lossy and lossless modes. The lossy mode is derived from the VP8 video codec's intra-frame coding (the same technology used in WebM video), applying block prediction, transform coding, and adaptive quantization to photographic content. The lossless mode uses a distinct algorithm combining predictive coding, color space transforms, backward reference to repeated pixel patterns, and entropy coding. WebP also supports alpha transparency in both modes — lossy WebP with transparency is unique among common web formats, offering semi-transparent images at much smaller sizes than PNG. The format supports animated sequences as well, providing a modern alternative to GIF with full-color support and dramatically better compression. One advantage is substantial file size reduction — lossy WebP produces images 25-35% smaller than JPEG at equivalent visual quality, and lossless WebP is typically 26% smaller than PNG, directly improving web page loading speed and reducing bandwidth costs. Universal browser support provides another key strength: Chrome, Firefox, Safari, Edge, and all mobile browsers now render WebP natively, achieving the broad adoption threshold needed for practical deployment. Google's core web infrastructure (Search, YouTube thumbnails, Gmail) uses WebP extensively, and the format is supported by major CDN platforms, CMS systems, and image processing services. WebP has established itself as the primary modern alternative to JPEG and PNG for web content.
Developer: Google
Initial release: September 30, 2010

Frequently Asked Questions

Why convert OTB to WEBP?

OTB is tied to Nokia mobile phones. Switching to WEBP gives you modern web format with superior compression and broad support across platforms, browsers, and devices.

How do I open a WEBP file?

Software that handles WEBP includes Chrome, Firefox, Edge, Safari, Photoshop, GIMP — giving you options on every major operating system.

How long does OTB to WEBP conversion take?

Usually just seconds. OTB files are typically small, so the upload, conversion, and download process finishes very quickly on Convertio.

What platforms support this OTB converter?

The converter works on any platform with a web browser — Windows, macOS, Linux, Android, and iOS all supported for OTB to WEBP conversion.

What exactly is the OTB format?

OTB is an Over-The-Air bitmap format for early Nokia phones. Originally from Nokia mobile phones, it has become a legacy format — conversion is the most practical way to use these images today.