SRT to ASS converter

Convert SRT to ASS: get an .ass file with the same captions and timing and one default style, ready to restyle in Aegisub or draw with ffmpeg.

Choose a subtitle fileor drop it here — or paste the text below

The conversion runs in your browser. Your file is not uploaded.

What the SRT to ASS converter does

The SRT to ASS converter writes every SRT caption as an ASS dialogue line with the same start and end time, under a single style named Default: white Arial with a black outline, centred at the bottom of a 1920×1080 frame. Line breaks are kept. The conversion runs in your browser: the subtitle file is read on your device and is not uploaded.

What the converted ASS file contains

[Script Info]
ScriptType: v4.00+
PlayResX: 1920
PlayResY: 1080

[V4+ Styles]
Style: Default,Arial,64,…

[Events]
Dialogue: 0,0:00:00.75,0:00:02.67,Default,,0,0,0,,However, due to the slow

Change the font, size, colours or position once in the Style: line and every caption follows.

When to convert SRT to ASS

Styling in Aegisub. Aegisub works on ASS files, so converting is the first step to fonts, colours and positions.
Burning in with ffmpeg. The ass filter draws an ASS file into the video with the style it carries.
Players that honour styles. VLC and mpv show ASS subtitles with their own look.

Styled ASS subtitles without editing the file

For captions with a designed look — word-by-word highlight, boxes, bold colours — open the SRT file and its video in add subtitles to video, pick a style, and export either a styled ASS file or an MP4 with the subtitles in the picture.

ASS style fields worth changing after converting SRT to ASS

Field	What it sets	Example
Fontname	The font, by the name installed on the system	`Arial`
Fontsize	Size in the script’s own resolution (PlayResY)	`64`
PrimaryColour	Text colour, written blue-green-red	`&H0000FFFF` is yellow
Outline	Thickness of the border around the letters	`3`
Alignment	Position on a numeric-keypad grid	`2` bottom centre, `8` top centre
MarginV	Distance from the bottom or top edge	`60`

Burning the ASS file into a video with ffmpeg

ffmpeg -i video.mp4 -vf "ass=subtitles.ass" -c:a copy output.mp4

The ass filter draws the subtitles with the style in the file. To choose the look by eye instead — on your own video, with a live preview — use burn subtitles into video.

SRT to ASS FAQ

How do I convert SRT to ASS?+

Drop the .srt file on the SRT to ASS converter, or paste its contents, then select Download to save the .ass file.

Which style does the converted ASS file use?+

The converted ASS file has one style, Default: Arial at size 64 on a 1920×1080 canvas, white with a black outline, placed bottom centre.

Does SRT to ASS conversion change the timing?+

SRT to ASS conversion keeps every start and end time. ASS stores times to a hundredth of a second, so milliseconds are rounded to two decimals.

Can the ASS file be converted back to SRT?+

An ASS file converts back to SRT with the ASS to SRT converter, which removes the styling and keeps text and timing.

Is the SRT file uploaded?+

The conversion runs in your browser: the subtitle file is read on your device and is not uploaded.

Need subtitles from a video?

SubtitlePop listens to your video and writes the captions for you, with word-level timing. Try the subtitle generator or make a file with the SRT generator. New to subtitle formats? Read what an SRT file is.