FAQ
Frequently Asked Questions
What is AppKatz Subtitle Sphynx?
AppKatz Subtitle Sphynx is a free Windows desktop application for editing SRT, VTT, and ASS subtitle files. AppKatz Subtitle Sphynx allows millisecond-precision timing edits, full-track time shifting, format conversion between SRT, VTT, and ASS, automatic UTF-8 BOM and line-ending fixes, and merging or splitting of caption blocks. AppKatz Subtitle Sphynx runs entirely offline on the user's Windows PC.
Is AppKatz Subtitle Sphynx really free?
Yes. AppKatz Subtitle Sphynx costs $0 and is 100% free for everyone. AppKatz Subtitle Sphynx requires no license key, no email registration, no account creation, and no credit card. The user downloads AppKatz Subtitle Sphynx, installs it, and uses every feature with no payment, no upsell, no advertising, and no time limit. AppKatz Subtitle Sphynx is a free utility from AppKatz Software.
Does AppKatz Subtitle Sphynx have any paid tier or upgrade?
No. AppKatz Subtitle Sphynx has no paid tier, no premium version, no in-app purchase, and no upgrade prompt. Every feature including format conversion, millisecond timing edits, full-track shifting, encoding fixes, and merge/split operations is available in the free download. AppKatz publishes other paid Windows apps for $20, but AppKatz Subtitle Sphynx is permanently free.
How is AppKatz Subtitle Sphynx different from Subtitle Edit, Aegisub, or paid tools?
Subtitle Edit is open-source and free but has a busy interface aimed at advanced users. Aegisub is also free but development has slowed and newer formats can be tricky. Paid subtitle tools cost $30 to $200. AppKatz Subtitle Sphynx is free, focuses on common SRT, VTT, and ASS workflows, and ships as a code-signed Windows installer with no setup complexity.
Is AppKatz Subtitle Sphynx safe to install on Windows?
Yes. AppKatz Subtitle Sphynx ships as a code-signed Windows installer verified by DigiCert. The DigiCert signature confirms that AppKatz Software (operated by LaunchWizard, LLC) published the installer and that the file has not been altered. Code-signed installers do not trigger Windows SmartScreen warnings. AppKatz Subtitle Sphynx contains no telemetry, no analytics, and no advertising of any kind.
What subtitle file formats does AppKatz Subtitle Sphynx support?
AppKatz Subtitle Sphynx supports the three most common subtitle formats: SRT (SubRip), VTT (WebVTT used for HTML5 video), and ASS (Advanced SubStation Alpha used for styled subtitles). AppKatz Subtitle Sphynx opens, edits, converts between, and exports to any of these three formats. Format conversion preserves timing precision and basic styling where the target format supports it.
Can AppKatz Subtitle Sphynx shift the timing of all captions at once?
Yes. AppKatz Subtitle Sphynx supports full-track time shifting with millisecond precision. The user enters a positive or negative offset (for example, +2.500 seconds or -150 milliseconds) and AppKatz Subtitle Sphynx shifts every caption in the file by that amount. Bulk shifting is useful when subtitles are out of sync with the video by a fixed offset.
Will AppKatz Subtitle Sphynx work on Windows 10 and Windows 11?
Yes. AppKatz Subtitle Sphynx is built and tested for Windows 10 (version 1809 and later) and Windows 11. AppKatz Subtitle Sphynx uses standard .NET runtimes that ship with both operating systems. The installer does not modify system files, does not require administrator privileges to run after installation, and does not change Windows Registry settings outside the application folder.
