SRT Editor & Subtitle Sync

CyphLab

About this app

Edit and synchronize existing subtitle files directly on Android. Open SRT or supported WebVTT files, correct text and timestamps, fix subtitle delay, repair timing drift, preview your changes, and save a corrected copy.

EDIT SUBTITLE TEXT AND TIMESTAMPS

Open an existing SRT or VTT subtitle file and edit the parts that need attention. Change subtitle text, adjust individual cue start and end times, search for specific text, or use find and replace for repeated corrections.

FIX SUBTITLE TIMING

When subtitles appear too early or too late, shift the timing forward or backward by a precise offset. You can adjust the whole file or work with selected subtitle cues when only part of the file is out of sync.

REPAIR GRADUAL TIMING DRIFT

Sometimes subtitles are correct at the beginning but slowly move out of sync later in the video. Use two timing reference points to apply a gradual correction between them instead of applying only one global offset.

PREVIEW BEFORE YOU APPLY

Review timing changes before applying them. The app can also validate subtitle timing and help identify problematic timestamps so you can fix issues with more confidence.

SRT AND WEBVTT TOOLS

• Open and edit SRT subtitle files
• Open supported VTT / WebVTT files
• Edit subtitle text and individual timestamps
• Shift all subtitle timings forward or backward
• Shift selected subtitle cues
• Fix subtitle delay and out-of-sync timing
• Repair progressive subtitle timing drift
• Search subtitle text
• Find and replace text
• Undo and redo edits
• Validate subtitle timing
• Preview timing changes
• Convert supported SRT files to VTT
• Convert supported VTT files to SRT
• Save edits as a new subtitle file
• Share the corrected subtitle file

KEEP THE ORIGINAL FILE

Your original subtitle file remains unchanged by default. Save the corrected version as a new file, so you can keep the source file while testing or comparing your edits.

LOCAL SUBTITLE EDITING

Core subtitle processing happens locally on your device, so the editing workflow can work without uploading subtitle files for processing.

BUILT FOR EXISTING SUBTITLE FILES

This app is designed for people who already have an SRT or VTT subtitle file and need to edit text, correct timestamps, fix sync problems, or convert between supported subtitle formats.

It does not automatically transcribe audio, generate captions from speech, translate subtitles, download movie subtitles, or edit video files.

Open your subtitle file, fix what is wrong, preview the result, and export a corrected copy.