Auto-detect SRT / VTT / plain text. Convert, clean, time-shift.
Paste subtitles and click “Format”
To format subtitles: upload your SRT file — the tool adjusts timing, converts between SRT and VTT, and checks characters-per-second limits, all in your browser.
FreeToolHub SRT Subtitle Formatter is a free browser-based tool that formats, converts, and fixes SRT subtitle files, no signup, no upload.
All formatting is performed locally in your browser — your subtitle file and video timestamps are never uploaded. Timing adjustments use standard .srt conventions. Always preview the output with your actual video before publishing.
About this tool
Clean, convert and time-shift SRT/VTT caption files with auto format detection. Free, in-browser.
What Is the SRT Caption & Cleaner?
The SRT Caption & Cleaner is a free browser-based text tool that performs SRT formatter operations instantly without any server processing. Built entirely with JavaScript, it handles your text locally — no content, documents, or data is ever uploaded to a remote server. The tool supports subtitle converter formats and handles large text inputs efficiently. Unlike online alternatives that impose character limits or require accounts, this tool processes unlimited text with no usage caps. Real-time processing means results appear as you type, with no submit button needed.
Who Should Use This Tool?
Writers and editors use this tool daily for SRT formatter tasks during content creation and revision. Developers convert subtitle converter data formats during API development and testing. Students use it to check word counts and reading times for essays and assignments. Translators process subtitle files and multilingual text. Bloggers format content for publishing platforms. Social media managers optimize post length for different platforms. The tool is especially valuable in corporate environments where pasting confidential text into external websites violates data policies — everything stays local.
How to Use the SRT Caption & Cleaner
Paste or type your text into the input area — the tool processes it instantly with no submit button needed. For SRT formatter operations, select your desired options from the control panel. The output panel shows results in real time with live statistics. Use the copy button to transfer results to your clipboard. For batch processing, the tool handles multiple paragraphs or files at once. All processing happens in your browser's JavaScript engine — close the tab and your data is gone. Download results as a text file or copy directly into your workflow.
Frequently asked
Can it convert and time-shift subtitle files?
Yes. Convert between SRT and WebVTT formats, shift timestamps by ±milliseconds (fix sync drift), and clean formatting errors (missing sequence numbers, incorrect timestamp delimiters). Auto-detects input format. A 2-hour movie subtitle file (2,000+ cues) processes in under 1 second with frame-rate conversion support (23.976, 25, 29.97 fps).
What common subtitle errors does it fix?
It repairs: BOM characters that break players, CRLF vs LF line-ending inconsistencies, missing blank lines between cues, timestamps using periods instead of commas (SRT requires 00:01:23,456), and overlapping cue timings. These errors cause subtitles to display as raw text or not appear at all in VLC, Plex, and smart TV players.
Related tools
Why did the fish blush?
No paywalls, no signups, no data sold. Built by a solo developer who believes useful tools should be accessible to everyone.
☕Support me on Ko-fi— keep tools free100% of proceeds go towards hosting & building more free tools.