Remove SDH & Audio Annotations
Fast. Private. Perfect.
Instantly strip hearing-impaired annotations (e.g., [APPLAUSE], (MUSIC)), speaker names, and musical notes from subtitle files.
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
Upload your subtitle file.
Toggle which cleaning rules to apply: sound effects, speaker labels, music notes, and uppercase-only mode.
The remover scans every cue and strips SDH annotations using pattern matching.
Cues that become empty after cleaning are automatically removed.
Download the clean subtitle file ready for translation or normal viewing.
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.
What the SDH Remover Cleans
Who Needs SDH Removal?
Translators & Localization
SDH annotations like [APPLAUSE] and speaker names become noise when translating. Remove them before translating to keep the clean dialogue.
Normal Viewing
Public subtitle files often include SDH for the hearing impaired. Strip the annotations for a cleaner viewing experience.
Re-editing & Re-timing
Sound effects and speaker labels interfere with editing workflows. Clean them out first, then work with pure dialogue.
Second-pass Compression
Before compressing or shortening subtitles, remove all non-speech content so you only edit actual dialogue.
HI Annotation Cleanup
Turn SDH or hearing-impaired (HI) subtitles into a dialogue-only track by removing sound effects, speaker names, and music symbols before translation or playback.
Frequently Asked Questions
SDH (Subtitles for the Deaf and Hard of Hearing) includes sound-effect descriptions like [applause], (music), and [doorbell] in addition to dialogue. For normal viewing or machine translation, these annotations are distracting noise — removing them gives you clean, pure dialogue text.
It removes all-caps labels like JOHN:, MAN 1:, NARRATOR -, and title-case names like John: or Mary Smith:. Labels must be at the start of a line and followed by a colon or dash.
Input: SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, STL, SMI. Output preserves the input format where reliable round-tripping is available; otherwise it falls back to SRT.
Enable Uppercase Only mode (on by default). This only removes bracketed content that is fully uppercase, which matches how sound effects are written. Normal parenthetical text like (see page 5) is preserved.
Cues whose text is entirely SDH content become empty after cleaning. These are automatically removed so your file stays clean with no blank subtitles.
Yes, it is free with no sign-up. Files can be up to 50 MB each, and processing runs entirely in your browser.