SRF
SRF (Sony RAW File) is a proprietary RAW image format from Sony that was introduced in January 2004 with the legendary Cybershot DSC-F828. It was Sony’s first attempt to establish a RAW format, but it was quickly replaced by SR2 (as early as 2005) and eventually by ARW (2006). As a RAW format, it contains, […]
Read MoreDNG
DNG stands for Digital Negative and is an open RAW format released by Adobe on 27 September 2004. I think the name (much like ‘RAW’) explains very well what the files contain: the unaltered(*) raw data of the photograph – essentially a digital negative. Since the iPhone 12 Pro and 12 Pro Max, Apple has […]
Read MoreWhy Android 15 Downloads .ogg Files as .ogg.ogx – A MIME Type Analysis
TLDR: Many web servers, including Wikimedia and Wikia, send .OGG and .OPUS files with the outdated application/ogg content type. Android 15 has adjusted the logic of file extensions and now creates .ogg.OGX files in the download folder. The .ogx file extension is not commonly encountered. The solution is to correctly name the MimeTypes in the […]
Read More3GPP
3GPP files are video files, very similar to MP4. 3GPP stands for Third Generation Partnership Project and refers to both the standardisation organisation and the format it developed. Introduced in 2003, the format is specifically designed for 3G smartphones, i.e. for slow connections (by today's standards) and limited storage space. The files usually have the […]
Read MoreArchive Converter
With file-converter-online.com, you can easily convert various file archives (e.g. .RAR, .ZIP, .7Z, .tgz and many more) into other archives. This saves you from having to install additional software, as most archives can be opened directly after conversion to the familiar .ZIP format. The following archive formats are currently supported: .rar, .zip, .tar.gz, .tgz, .gz, […]
Read MoreQTA to MP3
QTA stands for QuickTime Audio and is Apple's new file format for voice memos. It was introduced at the end of 2024 with iOS 18.2 and has since appeared on newer generations of iPhones, particularly the iPhone 16 Pro and Pro Max. Depending on the settings, when you make and export a voice recording on […]
Read MoreQT
QT stands for QuickTime and refers to Apple's classic container format for multimedia files. The file extension .QT is technically identical to the now more familiar .MOV. Currently, it is mostly older QuickTime files that are still saved with the .qt file extension. These files mostly date from the 1990s and 2000s. During my research, […]
Read MoreQTA
QTA (QuickTime Audio) is a proprietary file format that Apple introduced at the end of 2024 with iOS 18.2 for the iPhone 16 Pro and iPhone 16 Pro Max. It is used for voice recordings and marks a change from the M4A format used previously. The admittedly very technical background: QTA is based on First […]
Read MoreReport 2025
Every year, Online-Umwandeln.de processes millions of files. In 2025, we once again successfully reduced, converted, and edited more than 7,000,000 files. The following evaluation shows trends and statistics on the results of our conversions. Statistics on PDF reduction: In 2025, PDF reduction was once again one of the most popular tasks at Online-Umwandeln.de. More than […]
Read MoreQT to MP3
QT stands for QuickTime and refers to Apple's container format for audio and video files. QT files with the file extension .MOV are better known, but .qt is also used, and both formats use exactly the same QuickTime container. To my knowledge, the file extension .qt has never been officially documented by Apple. Source [1], […]
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