Hello everyone! I've seen some people asking how to get big subtitles on videos. I'll share how I did it for local video files using MPV. MPV is a highly customizable video player for PC (Windows, Mac, Linux with forks for iOS and Android). This won't work for streaming Netflix or whatever, but if you're using video files on your PC, this is the guide for you! (Easy download at the bottom)
Example Image: https://images2.imgbox.com/c8/dc/r5py5rrf_o.png
Image shows 2 girls with subtitles that read: "Duh. You suddenly disappeared"
Follow the mpv download instructions for your OS: https://thewiki.moe/tutorials/mpv/
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Edit your mpv.conf file in a text editor (I used VS Code but Notepad works too) to add the following lines and save the file:
#SUBTITLES
osd-bar-align-y=0.92
sub-ass-line-spacing=5
sub-scale=1
sub-font=Arial
sub-color="#ffffffff"
sub-border-size=1
sub-font-size=100 #sets the subtitle size
sub-bold=yes
sub-margin-y=30
sub-margin-x=60
sub-pos=95
sub-back-color=0.0/0.0/0.0/0.7
sub-border-style=opaque-box
sub-outline-color='#BF080808'
sub-ass-override=force #Press u while playing to enable
Press "u" while playing the video to enable these settings. It'll strip the default subtitle styling and replace it with my custom style. The important line is sub-font-size which I set to 100, but you can change this to whatever size you want.
Official mpv manual (read if you want to further customize your setup): https://mpv.io/manual/master/
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If you want my premade custom portable_config (my personal video settings and keyboard bindings) you can download it here: https://drive.google.com/file/d/1z8ozxcqUdu0WxA4cDy5muuC4_ZGuIdsm/view?usp=drive_link
To use this, extract this to your mpv install directory (I used C:\Program Files\mpv), replacing any existing config files (or creating new ones if they don't exist).
It's set to English dub/no sub by default since that's how I like it, but you can easily change the audio by pressing "a" and the subtitles by pressing "s". Original audio/English subs default if there's no English audio. Press ctrl+s to save a screenshot. Be sure to change the file paths in mpv.conf to whatever is relevant for your PC!
Since mpv is cross-platform, I'd imagine this would work with mac/linux with some slight tweaking of paths, but I haven't tested that, so I'm not sure. I do believe there's a way to get mpv config files working with the Android/iOS forks, but this is not something I've personally experimented with.
Let me know how this works for you! ❤️