Fix Subtitles

What this tool does

This tool checks SRT, WebVTT, ASS, SSA and SBV files for overlapping times, wrong order, empty or duplicate lines, and subtitles that are too short or too long. It fixes the problems you choose and shows a table of each problem before and after. Lines are renumbered at the end.

How to fix an SRT file

1. Select Choose files and add subtitle files, or use Paste text.
2. Choose which problems to fix. All fixes are on by default, and overlaps shorten the earlier subtitle.
3. Select Fix and read the Check results table: each problem is counted before and after fixing.
4. Select Download for one file or Download all (ZIP) for several files.

To check a file without changing it, turn off every fix and set Overlapping subtitles to Leave as they are. The report still counts each problem.

Options explained

• Renumber subtitles, Sort by start time, Delete empty subtitles and Delete exact duplicates are on. Duplicates have the same start, end and text; the first copy stays.
• Overlapping subtitles defaults to shortening the earlier subtitle. Move the later subtitle keeps every duration and moves the following subtitles later as needed.
• Minimum gap between subtitles defaults to no gap. 83 ms leaves two frames at 24 fps between subtitles.
• Lengthen short subtitles extends subtitles under 700 ms, only into free time. Shorten long subtitles cuts subtitles over 7000 ms. Both limits can be changed.
• If you leave duplicates and overlaps in place, the tool may shorten a subtitle further to keep it distinct within the duration limits. If the limits leave no room, it asks you to change the settings.
• The output keeps the input format and is saved as UTF-8. SRT and ASS files keep their line endings; WebVTT and SBV are saved with LF line endings.

Example

With the default options, the subtitles are sorted and the first one now ends when the second one starts:

1
00:00:06,000 --> 00:00:08,000
See you tomorrow.

2
00:00:01,000 --> 00:00:04,000
Hold the door.

3
00:00:03,500 --> 00:00:05,000
I've got it.

Output:

1
00:00:01,000 --> 00:00:03,500
Hold the door.

2
00:00:03,500 --> 00:00:05,000
I've got it.

3
00:00:06,000 --> 00:00:08,000
See you tomorrow.

Format notes and limits

• Reads SRT, VTT, ASS, SSA and SBV. ASS comment lines are not checked or changed. ASS and SSA times are saved in hundredths of a second: minimum durations and gaps round up, and maximum durations round down, to meet your limits.
• Common mistakes are repaired while reading, such as missing numbers, a dot instead of a comma, or “->” instead of “–>”. The file shows a note when this happens.
• Up to 50 files, 20 MB per file and 200 MB in total.
• If the whole file is early or late, use Shift subtitles; if the delay grows, use Sync subtitles. To remove sound notes, use Clean subtitles. To rewrap long lines, use Subtitle line breaker.

Questions