All Subtitle Tools
Every tool runs instantly in your browser — 113+
Convert
(3)Switch between formats, fix encoding, and change frame rate.
Batch Subtitle Converter
Batch convert subtitles between SRT, VTT, ASS, SSA, LRC, SBV, TTML, SCC, SMI, STL, and TXT formats at once. Completely free, no registration required.
SRT to UTF-8 Converter
Convert SRT to UTF-8, or between GB18030, BIG5, Shift-JIS, EUC-KR and more. Fix garbled subtitle text. Free, browser-based, no upload.
Subtitle Frame Rate Converter
Convert subtitle frame rates between 23.976, 24, 25, 29.97, 30, 48, 50, 59.94 and 60 fps. Fix NTSC/PAL speedup sync issues. Free, browser-based, no upload.
Edit & Clean
(6)Fix text, styling, and layout in seconds.
Subtitle Cleaner
Clean subtitle files online. Remove HTML tags, ASS override blocks, hearing-impaired annotations, duplicate lines, and fix spacing. Upload SRT, VTT, ASS, SSA.
Subtitle Editor
Edit subtitle files online. Modify text, adjust timecodes, add and delete cue rows in a table editor. Export to SRT, VTT, or ASS. Free, browser-based, no.
Subtitle Styler
Style your subtitles with custom colors, fonts, positions, and outlines. Export as ASS, VTT, or SRT with styling preserved. Free, browser-based, no upload.
Smart Subtitle Cleaner
Smart-clean subtitles with language-aware rules for Chinese, Japanese, Korean, and English. Normalize punctuation, quotes, dashes, and CJK spacing. Free.
Subtitle Find & Replace
Search and replace text in subtitle files with regex, whole-word, and case-sensitive options. Preview all matches before replacing. Free, browser-based, no.
Smart Line Balancer
Automatically wrap and balance subtitle lines to fit any character-per-line limit. Grammar-aware line breaking that avoids splitting after prepositions.
Sync & Time
(4)Re-time and adjust the subtitle clock.
Subtitle Sync
Shift subtitle timing forward or backward, or use two-point calibration to fix stretched/desynced subtitles. Free, browser-based, no upload required.
Subtitle Speed Adjuster
Adjust subtitle speed by stretching or compressing all timecodes by a factor. Perfect for video speed changes. Free, browser-based, no upload.
Partial Subtitle Sync
Adjust timing for only a range of subtitle cues instead of the entire file. Fix subtitles that drift out of sync partway through. Free, browser-based, no.
Frame Gap Fixer
Fix subtitle timing for Netflix and BBC QC compliance. Enforce a minimum 2-frame gap between adjacent cues so QC never flags zero-gap intervals. Set gap by.
Merge & Split
(5)Combine, split, and restructure files.
Subtitle Merger
Merge two subtitle files into a single bilingual (dual-language) subtitle or combine them sequentially. Free, browser-based, no upload required.
Subtitle Splitter
Split subtitle files by cue count, number of parts, or at a specific time. Free, browser-based, no upload required.
Bilingual Subtitle Merger
Merge two subtitle files in different languages into a single bilingual subtitle. Supports stacked or side-by-side layout. Output as SRT, VTT, ASS, or TXT.
Auto-Merge Short Cues
Automatically merge fragmented subtitle cues from Whisper and YouTube. Combine adjacent short cues separated by tiny pauses into clean, readable lines. Fix.
Style-Safe Subtitle Splitter
Split long subtitle lines at any position while preserving HTML and ASS override tags. Tags are automatically closed and reopened so both halves render.
Quality & QA
(5)Check, diff, and auto-fix issues.
Subtitle Quality Checker
Analyze subtitle files for quality issues: reading speed (CPS), line length, overlapping cues, timing gaps, and empty text. Get a quality score. Free.
Subtitle Diff Tool
Compare two subtitle files side by side and find every difference. Word-level highlighting, similarity score, and timing changes. Free, browser-based, no.
Auto Fix Subtitles
Automatically detect and fix subtitle problems: overlapping cues, high reading speed (CPS), empty lines, tiny cues, and invalid timestamps. Preview changes.
Subtitle QA Report
Generate a professional subtitle QA report with an overall quality score. Analyze timing, reading speed, consistency, style, content, and encoding. Export as.
Subtitle Statistics
Get detailed subtitle statistics: cue count, characters, words, average and max CPS, duration, longest and shortest lines, language detection. Free subtitle.
AI Tools
(3)Translate, rewrite, and annotate with AI.
AI Subtitle Translator
Translate subtitles to any language using AI. Upload SRT, VTT, or ASS files and get professional-quality translations. Bring your own API key. Free.
AI Subtitle Annotator
Add pronunciation guides to Chinese and Japanese subtitles. Generate pinyin for Chinese characters, furigana for kanji, or romaji. AI-powered, browser-based.
AI Subtitle Rewriter
Use AI to rewrite subtitles: improve naturalness, fix grammar, shorten long lines, expand terse text, simplify, or rewrite conversationally. Bring your own key.
Advanced
(5)SDH removal, PDF export, and batch renaming.
Subtitle to PDF Converter
Convert SRT, VTT, ASS and other subtitles to a clean PDF. Timestamped table or transcript-only layout. Free, browser-based, no upload.
Subtitle Preview
Preview your subtitles in real-time with an optional video. Navigate through cues, check timing, and see how subtitles will appear. Free, browser-based, no.
SDH & Sound Effect Remover
Strip SDH annotations, sound effects in brackets, speaker name prefixes, and music notes from subtitles. Clean subtitles for translation or normal viewing.
Subtitle Duplicate Remover
Remove duplicate subtitle cues and merge them with extended timing ranges. Completely free, no registration required.
Batch Subtitle File Renamer
Batch rename subtitle files with flexible find-and-replace patterns and live preview. Completely free, no registration required.
Format Converters
Direct, one-click conversion between every supported format.
Ready to work on your subtitles?
Open the workspace to chain multiple tools, or batch-convert a whole folder at once.