VIFF to RAS — Format Comparison & Online Converter
Fast, instant VIFF to RAS conversion. No signup required. Just drop your .viff file and get .ras in seconds.
Batch Settings
VIFF（Visualization Image File Format）は、科学技術分野でよく用いられる画像形式ですが、一般的な環境での閲覧や編集には不向きな場合があります。一方、RAS（Sun Raster）形式は、歴史あるUNIX系のシステムで広く使われてきた画像形式で、特定の業務フローにおいては今でもその互換性が重宝されています。このページでは、お手持ちのVIFFファイルを、より汎用性の高いRAS形式へスムーズに変換する方法をご紹介いたします。特に、古いシステムとの連携や、特定のグラフィックソフトウェアでの処理が必要な場合に、この変換ツールがお役に立てることと存じます。複雑な設定は不要で、直感的な操作で高品質な変換を実現します。
- 研究データの共有
- レガシーシステムとの連携
- 学術論文への画像挿入
日本の研究機関や一部の産業分野では、UNIX系のワークステーションが今も現役で稼働しているケースがあり、RAS形式への変換はそうした環境でのデータハンドリングにおいて重要な役割を果たすことがあります。
About VIFF to RAS Conversion
VIFF and RAS are both image formats, but they differ in important ways. VIFF is a widely used file format. RAS is a widely used file format.
When you convert VIFF to RAS, the goal is to convert between formats quickly. Converting VIFF to RAS maintains high quality with CocoConvert's optimised encoder settings. Understanding these technical differences helps you choose the right format for your workflow.
Your VIFF file is decoded and re-encoded as RAS. The conversion involves 4 steps: (1) your viff file is uploaded and validated, (2) the file is decoded (parsed into its raw data), (3) the data is re-encoded in ras format, (4) the converted file is ready for download.
CocoConvert's converter handles the entire pipeline server-side using FFmpeg, Sharp, and qpdf — battle-tested libraries used by streaming platforms and enterprise tools. Files are encrypted in transit and deleted within 24 hours.
This conversion is ideal when you When you need a RAS file. For the opposite direction, CocoConvert also supports RAS to VIFF conversion.
How to Convert VIFF to RAS
- 1
Upload .viff file
Select your VIFF file by dragging it to the upload zone or using the file picker. Batch upload is available for multiple files.
- 2
Choose .ras
Set RAS as the output format. The converter uses optimal settings based on the VIFF→RAS conversion profile.
- 3
Convert
The server-side engine decodes your VIFF file and re-encodes it as RAS. Processing time depends on file size and complexity.
- 4
Download result
Grab your converted .ras file. Multiple output files can be downloaded together.
What Happens When You Convert VIFF to RAS
Your VIFF file is decoded and re-encoded as RAS.
Your VIFF file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in RAS format
The converted file is ready for download
Format Comparison
VIFF
.viff file
| Extension | .viff |
| MIME Type | image/x-viff |
| Category | Image |
RAS
.ras file
| Extension | .ras |
| MIME Type | image/x-sun-raster |
| Category | Image |
Should You Convert VIFF to RAS?
When to Convert
- ✓When you need a RAS file
Frequently Asked Questions
What is the difference between VIFF and RAS?
VIFF is a widely used file format. RAS is a widely used file format.
Does VIFF to RAS conversion affect quality?
Converting VIFF to RAS maintains high quality with CocoConvert's optimised encoder settings.
Which format has better compression, VIFF or RAS?
VIFF is a common image format. RAS is widely supported. The better choice depends on whether you prioritize file size or quality.
How long does VIFF to RAS conversion take?
Most conversions finish in seconds. Larger files or complex image content may take 10–30 seconds. CocoConvert processes files in parallel for batch jobs.
Is VIFF or RAS better for long-term storage?
Both formats use lossy compression, so consider keeping your original source file for long-term storage.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.