PNG to RAS Converter
Convert a PNG into Sun Raster (.ras) format. Drop a PNG file below — conversion happens locally on your device, so the file never leaves your computer.
Drop files, or click to browse
PNG files only — any size, any number of files
Frequently asked questions
Is this PNG to RAS converter really free?+
Yes. There's no file limit, no watermark, and no account required. Because the conversion runs in your browser instead of on a server, there's no processing queue to pay for.
Is my file uploaded anywhere?+
No. Orbfile decodes and re-encodes the image locally using ImageMagick compiled to WebAssembly, running entirely inside your browser tab. The bytes never leave your device.
Will converting to RAS lose quality?+
There's a quality slider so you can balance file size against visual quality. At high quality settings the difference is usually invisible.
Can I convert more than one file at once?+
Yes — drop as many files as you like and download them individually or as a single ZIP.
Is there a maximum file size?+
There's no fixed upload limit — Orbfile isn't uploading anything. The practical ceiling is your device's own memory, which comfortably handles even large, high-resolution photos.
How do I convert PNG to RAS?+
Drop your PNG file into the box above — it's automatically converted to RAS and a download link appears in seconds. No settings are required, though you can adjust quality if the tool offers a slider.
About PNG and RAS
What is PNG?
PNG is a lossless image format built for sharp edges, flat colors, and transparency — think logos, screenshots, and UI graphics rather than photos.
Full PNG format guide →What is RAS?
RAS (Sun Raster) is the native bitmap format of Sun Microsystems' SunOS/Solaris workstations from the 1980s and 90s.
Full RAS format guide →PNG and RAS solve different problems. PNG is great for logos and icons, but RAS pulls ahead when you need simple, well-documented header — easy for tools to parse. If that's the situation you're in, converting is worth it.
How it works
- 1
Drop your file in
Drag your image onto the box above, or click it to browse — there's no account to create and no upload to wait on.
- 2
Pick your settings
The output format is already set for this page — just adjust any extra options shown, if there are any.
- 3
Download the result
Your browser processes everything locally and hands you a download link the moment it's done — nothing was ever sent to a server.
Is it private?
Everything happens locally, inside this browser tab. Your image is read from disk, processed with WebAssembly running on your own device, and handed back to you as a download — it's never transmitted anywhere, so there's nothing to intercept and nothing stored on a server.
Common use cases
- Opening or converting old Sun workstation screen captures and bitmap files
- Preparing images for a website or online store
- Attaching a photo to an email with a size limit
- Getting a screenshot ready to share or document
Supported formats
This is one of many pairings the image toolkit handles. In total it covers:
Related conversions
Format details
About PNG files+
PNG is a lossless image format built for sharp edges, flat colors, and transparency — think logos, screenshots, and UI graphics rather than photos.
PNG (Portable Network Graphics) was created in the mid-1990s as a free, patent-unencumbered replacement for GIF, and it inherited GIF's lossless approach while adding full 24-bit color and an alpha transparency channel. Because nothing is thrown away during compression, a PNG can be re-saved indefinitely without ever degrading — a real advantage for screenshots, diagrams, and anything with text or hard edges, where JPEG's compression tends to introduce visible smudging. The cost is file size: for photographic content, a PNG is typically several times larger than an equivalent JPEG, which is why most photo libraries still default to JPEG and reserve PNG for graphics.
How to open a PNG file
Opens readily in Any web browser, Your operating system's default photo viewer. For real editing, use Adobe Photoshop, GIMP, Affinity Photo.
Good for
- lossless — no generation loss on re-saving
- full alpha transparency
- crisp text and hard edges
Watch out for
- much larger files than JPG for photographic content
About RAS files+
RAS (Sun Raster) is the native bitmap format of Sun Microsystems' SunOS/Solaris workstations from the 1980s and 90s.
Sun Raster was the default way SunOS and early Solaris systems stored screen captures and bitmap images, defined in Sun's own rasterfile.h header in 1989. A file opens with a fixed 32-byte header carrying its magic number, dimensions, and bit depth, optionally followed by a color palette and then the pixel data itself, either stored raw or run-length encoded. It supports 1-, 4-, 8-, 24-, and 32-bit depths but no transparency, and while it was genuinely common on Unix workstations in its day, it's now almost exclusively encountered when working with archived files from that era.
How to open a RAS file
Opens readily in For real editing, use GIMP, IrfanView, ImageMagick.
Modern operating systems have no built-in viewer for RAS — a converter or an editor with RAS support is needed.
Good for
- simple, well-documented header — easy for tools to parse
- supports both raw and RLE-compressed pixel data
Watch out for
- no transparency support
- obsolete outside legacy Unix/Solaris archives
Need a different format? Try the full Image Converter, or explore all image tools.