SUB → SRT Converter
Convert your old SUB subtitles to the common SRT format.
Drop files here
or click to select
Other Popular Conversions
Convert your SRT subtitle files to HTML5-compatible WebVTT (VTT) format.
Convert your VTT subtitles to the most common format, SRT.
Convert your SRT files to ASS format with advanced styling support.
Convert your ASS files to standard SRT format.
Convert your SRT subtitles to SUB format.
Convert your VTT subtitles to ASS format.
Frequently Asked Questions
How to convert from SUB to SRT?
All you need to do is drag your SUB file into the upload area above and click the Convert button. The process happens locally in your browser and completes in seconds. Then you can download the converted file to your device.
Are my files private when uploaded to the converter?
Yes, absolutely. PRIZMA operates with a zero-server architecture. This means your uploaded files are never transferred to any server; the entire process happens in your own device's browser and memory. Therefore, your files are 100% secure and private.
Do I have to pay for this conversion process?
No, all conversion tools on our platform are completely free and can be used unlimitedly without requiring any registration or membership.
Do I need to install any software?
No installation is required. PRIZMA works entirely inside your web browser (Chrome, Firefox, Edge, Safari), on desktop or mobile, with no extensions or apps to download.
Does converting SUB to SRT reduce quality?
It depends on the formats and settings you choose. Some conversions (like PNG to JPG) can involve quality trade-offs, which you can control with the quality/bitrate options on this page. Lossless conversions between compatible formats keep full quality.