Readcast is a lightweight browser player for listening to an .mp3 while reading along with a matching .srt subtitle file. Drop your files in and the page keeps audio and text in sync so you can jump to any line, follow along hands-free, or copy passages for reference.

All processing happens in the browser; files are not uploaded anywhere.

Some VBR .mp3 files without proper headers may seek less accurately; uploading an MP3 with a Xing/VBR header can improve jumping precision. You can add the header with: ffmpeg -i input.mp3 -c:a copy -write_xing 1 output.mp3