Use this free subtitle formatter to convert plain text into a properly formatted SRT subtitle file ready to upload to YouTube, Vimeo or any video player. Set your line duration, adjust the start time and download the .srt file in seconds — no specialist software needed.
Your formatted SRT will appear here...
Subtitles and closed captions that are poorly formatted are genuinely hard to read — long run-on lines, inconsistent timing, random line breaks in the middle of sentences. Most creators who add subtitles either use auto-generated captions that need heavy editing or format them manually, which takes forever. This tool helps you clean up and format subtitle text quickly.
Paste your subtitle text in and the tool applies consistent formatting — correct line breaks, sensible line lengths, and clean punctuation — so your subtitles are readable and professional without hours of manual editing.
Step 1 — Paste your raw subtitle or caption text. Drop in your auto-generated captions, a transcript, or any text you want to format as subtitles. The messier the input, the more useful the formatting pass will be.
Step 2 — Apply the formatting. Click to format and the tool adjusts line breaks, sentence breaks, and line lengths. Review the output and check that it reads naturally — especially at points where sentences end and new lines begin.
Step 3 — Export and add to your video. Copy the formatted text and use it in your video editing software, your YouTube subtitle editor, or export as an SRT file if that option is available.
Breaking lines in the middle of a phrase or clause. A subtitle line that reads 'I think the most important thing you can do' as one line and 'is show up consistently' as the next is fine. But breaking mid-phrase creates a confusing read. Break at natural pause points — after commas, full stops, or complete clauses.
Making lines too long or too short. Subtitles work best at around 35-40 characters per line — long enough to carry a complete thought, short enough to read quickly. Very short lines (3-4 words) feel choppy. Very long lines (over 50 characters) scroll off screen on small devices.
Leaving in filler words from auto-generated captions. Auto-generated captions often include 'um', 'uh', 'like', 'you know' and other verbal filler. These are fine in audio but look unprofessional as on-screen text. Clean them out during the formatting pass.
The standard is 35-42 characters per line for broadcast subtitles. On YouTube and most streaming platforms, slightly longer lines are acceptable, but staying under 45 characters per line keeps subtitles readable across different screen sizes, including mobile.
Auto-generated captions have improved a lot but still need editing: filler words, mis-transcribed words, incorrect punctuation, and poor line breaks are common. Use auto-generated as a starting point and edit, don't publish them unreviewed.
Yes — YouTube can read subtitle text, which helps the algorithm understand your video content and improves discoverability. Adding accurate subtitles to your videos is one of the lower-effort ways to improve reach and accessibility simultaneously.
SRT (SubRip Subtitle) is the most common subtitle file format. It contains timed text entries — each entry has a sequence number, start and end timestamp, and the subtitle text. Most video platforms and editing software accept SRT files for synced subtitles.
Videos with subtitles get up to 40% more views. They're essential for deaf and hard-of-hearing viewers, improve comprehension for non-native speakers, and perform better in sound-off environments (85% of Facebook and Instagram videos are watched without sound). YouTube also indexes subtitle text for search, meaning captions directly improve SEO.