Validate SRT or VTT subtitles for timestamp errors, overlaps, numbering, reading speed, line length, duration, formatting and file diagnostics. Review safe repairs, fix subtitle timing issues, run import preflight checks, and download a clean delivery file locally.
Drag & drop an SRT or VTT here, or browse your device.
Check timestamps, order, overlaps, gaps, empty cues, line length, line count, duration, formatting and reading speed.
Use practical General, streaming, broadcast or editing-app presets, or define your own limits.
Normalize structure or select safe repairs, check destination compatibility, review the change summary, then download the cleaned file and report.
Mechanical faults, readability findings and file-level diagnostics are separated so you can decide what actually needs changing.
Professional subtitle tools distinguish mechanical faults from editorial choices. Automatic repair stays conservative: dialogue is not rewritten and reading-speed decisions remain yours.
SRT Subtitle Fixer is a free online SRT checker, SRT validator and subtitle fixer for creators, editors, translators and video teams. It checks subtitle timestamps, cue numbering, overlaps, gaps, reading speed, line length, duration, common formatting problems, file-level diagnostics and practical import preflight checks directly in your browser.
Find invalid timestamps, reversed timing, missing or incorrect cue numbers, empty subtitle cues and overlapping captions before delivery.
Review timing problems, shift a whole subtitle track when needed, and apply selected overlap or duration repairs without rewriting the dialogue.
Open WebVTT files, inspect cue timing and readability, run web-player preflight checks, and export a cleaned VTT while preserving the format.
Check SRT structure, timestamps, overlaps, numbering, CPS, line length, duration and file diagnostics before delivery.
Learn whether subtitles are uniformly early or late or have progressive drift, then correct timing locally and validate again.
Troubleshoot broken timestamps, missing separators, numbering, encoding and format mismatches before importing into editors or players.
No. The file is read and processed by your browser. Subtitle contents are not sent to a processing server.
SRT and WebVTT are supported for checking and export. VTT keeps its WEBVTT header and timestamp style. The destination preflight layer does not pretend to validate unsupported subtitle formats.
General, Netflix-style, Broadcast/BBC-style, YouTube, Premiere Pro, DaVinci Resolve, Final Cut Pro, Avid Media Composer and Custom. These are practical presets rather than claims of official platform compliance; always follow the exact delivery specification supplied by your client or platform.
The checker shows file size, detected text encoding, BOM presence, line-ending style and final-newline status. Replacement characters are also flagged during QC when detected in decoded text.
Destination diagnosis applies practical preflight rules for common import workflows such as strict SRT, Premiere Pro, DaVinci Resolve, Final Cut Pro, Avid Media Composer, YouTube and WebVTT. It helps explain likely import risks but is not a guarantee of platform acceptance.
It creates a clean serialized subtitle structure, sorts cues chronologically, removes recoverable empty cues and normalizes SRT numbering where applicable. It does not rewrite dialogue.
Selected structural repairs include numbering, sorting, missing cue separators, empty-cue removal, overlap handling, minimum-duration fixes, safe line wrapping and supported formatting-tag balancing. Dialogue meaning and reading speed are not automatically rewritten.
Yes. The local prompt generator uses the current QC findings and does not include your full subtitle text. Review any AI-generated subtitle carefully before importing it.
Yes. Copy the report to your clipboard or download a plain-text QC report after checking the file.
Read how the tool handles your data, find answers to common subtitle questions, or contact us with feedback and bug reports.
Select a repair to preview changes.
Your repaired cue preview will appear here.