Subtitle Format Cleaner
Fast. Private. Perfect.
Remove formatting tags, audio effect annotations, fix spacing errors, and eliminate duplicate lines in your browser.
Drag & drop your subtitle file here
or click to browse
SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, STL, SMI, TXT, JSON
How It Works
Drag and drop your subtitle file into the upload area, or click to browse. Supported inputs include SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, STL, and SMI.
The cleaner auto-detects the format and parses your file into structured subtitle cues.
Toggle cleaning options on or off - each option targets a specific type of unwanted content.
Click to process. The cleaner applies all selected options in sequence and preserves the input format when reliable round-tripping is available.
Preview the result with before/after cue counts, then download the cleaned file.
Why Choose AllSubConverter?
Your Privacy Matters
Everything runs in your browser. Your files are never uploaded.
Lightning Fast
Optimized processing engine converts files in seconds.
Free & Local
Each file can be up to 50 MB. Batches can contain up to 200 files or 1 GB total.
Works Everywhere
Works on Windows, Mac, Linux, iOS, Android - any modern browser.
Why Use the Subtitle Cleaner?
Who Needs a Subtitle Cleaner?
Streaming Platforms
Prepare clean, tag-free subtitle tracks for review against platform delivery specs.
Translators and Localization
Strip formatting markup and sound-effect annotations before feeding subtitles into CAT tools or translation memory.
Accessibility Compliance
Remove HI annotations and redundant duplicates while preparing standard subtitle files for review.
Content Creators
Fix spacing and formatting errors from auto-generated or OCR-extracted subtitles before publishing.
Media Archivists
Batch-clean legacy subtitle collections to remove outdated markup and standardize on plain SRT.
Educators and E-Learning
Prepare readable subtitle files for online courses by removing distracting annotations and duplicate lines.
SRT Cleanup Before Delivery
Turn a messy SRT export into a plain, readable subtitle track by removing markup, duplicate cues, sound labels, and spacing errors in one pass.
Frequently Asked Questions
It accepts SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, STL, and SMI files. The format is auto-detected, and output preserves the input format when reliable round-tripping is available. SRT is used as the fallback.
HI annotations describe non-dialogue audio for deaf and hard-of-hearing viewers, like (applause), [music], or [doorbell]. The cleaner can remove these to produce a standard subtitle track without sound-effect descriptions.
Usually. The options target formatting markup, sound-effect annotations, and duplicate lines. A cue whose entire text is a hearing-impaired annotation can be removed, and speaker-label removal can affect transcript-style dialogue; it is off by default.
No. All cleaning happens entirely in your browser using JavaScript. Your subtitle files never leave your device, making the tool safe for confidential or unreleased content.
When two consecutive subtitle cues have identical text, the cleaner merges them into a single cue whose end time is the later cue end time. This keeps timing continuous while removing redundancy.
Yes. Every cleaning option is a toggle. Six options are enabled by default (HTML tags, ASS overrides, HI annotations, duplicates, spacing, empty cues). Speaker-label removal is off by default since it is more aggressive.