SRT Subtitle Formatter
Paste your SRT subtitle content below to clean, reformat, and fix timing issues. Shift all timestamps forward or backward, strip HTML formatting tags, renumber subtitle entries, and download the cleaned file. View statistics including subtitle count, total duration, and average subtitle length. All processing happens locally in your browser.
How the SRT Subtitle Formatter Works
The SubRip Subtitle (SRT) format is the most widely used subtitle file format across video platforms and media players. An SRT file consists of numbered subtitle entries, each containing a sequential index number, a timestamp line showing the start and end times separated by an arrow (-->), and one or more lines of subtitle text. This tool parses each entry by splitting on double line breaks, extracting the timestamp components, and processing the text according to your selected options. The formatted output maintains proper SRT structure that is compatible with all major video players and subtitle editors.
SRT File Structure
Each subtitle entry follows this format:1 (index number)00:00:01,000 --> 00:00:04,000 (start --> end timestamp)Subtitle text here (one or more lines of text)
Entries are separated by blank lines. Timestamps use the format HH:MM:SS,mmm where mmm is milliseconds.
Common SRT Formatting Problems and Solutions
Subtitle files frequently have timing issues that cause text to appear too early or too late relative to the audio. This happens when the subtitle file was created for a different video edit, when the video has been trimmed or had segments added, or when converting from another format introduced a timing offset. The time shift feature in this tool lets you move all timestamps forward or backward by a specified number of seconds, correcting synchronization issues across the entire file in one operation.
Auto-generated subtitles from YouTube, Whisper, and other speech-to-text engines often contain HTML formatting tags like <i>, <b>, <u>, and <font> that are not supported by all media players. Some players display these tags as raw text instead of applying the formatting, creating an ugly viewing experience. The tag removal option strips all HTML-style tags from subtitle text, producing clean plaintext that renders correctly everywhere. Additionally, subtitle files from various sources sometimes have incorrect or missing index numbers, which can cause playback issues in certain players. The renumber option assigns sequential numbers starting from 1 to ensure proper ordering.
Working with Auto-Generated Subtitles
YouTube's auto-generated subtitles, exported via the platform or third-party downloaders, frequently need formatting cleanup before they can be used in other contexts. These subtitles often have overlapping timestamps, very short display durations, inconsistent punctuation, and HTML tags. While this tool addresses the timing and tag issues, the text content itself may still need manual review for accuracy. Professional subtitlers use tools like this as a first pass to clean up the structural formatting before doing a manual accuracy review of the transcription content.
Subtitle Statistics and Quality Analysis
The statistics panel shows the total number of subtitle entries, the total duration covered by subtitles (from the first start time to the last end time), and the average display duration per subtitle. Industry standards recommend that subtitles display for a minimum of 1 second and a maximum of 7 seconds, with most subtitles falling between 2 and 5 seconds. Subtitles that are significantly shorter or longer than these ranges may indicate timing problems or improperly segmented text. The character count per subtitle should generally stay below 84 characters (two lines of 42 characters) for comfortable reading speed.
Downloading and Using Formatted Subtitles
After formatting, you can download the cleaned SRT file directly from your browser. The downloaded file can be loaded into VLC, MPV, Plex, Kodi, and virtually any other media player that supports external subtitles. You can also upload it to YouTube, Vimeo, or other video platforms as a manual caption track. The file is generated client-side using a Blob URL, so no data passes through any server during the download process. Your subtitle content remains entirely private throughout the formatting and download workflow.