Free Subtitle Tools

Small, focused subtitle utilities that run 100% in your browser — nothing is uploaded. These handle the quick one-off jobs. The Desktop section below links to the free SUP/PGS-to-SRT converter; for speech recognition, hardcoded-subtitle OCR, translation, or batch burn-in, use the GeekLink desktop app.

Split

Bilingual (Chinese-English) SplitterSplit a Chinese + English SRT into separate SRT or TXT files. Japanese-English SplitterSplit a Japanese + English SRT into separate files. Korean-English SplitterSplit a Korean + English SRT into separate files.

Convert

SRT ↔ VTT Converter + ShiftConvert between SRT and VTT, and shift all timestamps by an offset.

Sync

Subtitle FPS ConverterRescale timing for a frame-rate change (e.g. 23.976 ↔ 25 fps).

Fix

Subtitle Encoding FixerDetect the real encoding of a garbled subtitle and re-save as UTF-8. Subtitle Encoding DetectorDetect a subtitle file's real character encoding (read-only).

QC

Subtitle CPS (Reading Speed) CheckerFlag subtitles that are too fast to read (characters per second). Subtitle Duration & Overlap CheckerFlag cues that are too short, too long, overlapping, or too close.

Other

Subtitle Stats (Word / Character Count)Count cues, lines, words, characters, and duration — handy for quotes. Video + Subtitle Preview PlayerPlay a local video with an SRT/VTT subtitle to check timing. No upload.

Desktop

Free SUP to SRT ConverterConvert Blu-ray SUP/PGS image subtitles into editable SRT locally on Mac or Windows.

Need the full workflow?

GeekLink transcribes with AI speech recognition, extracts hardcoded subtitles via OCR, translates into 40+ languages, and burns subtitles into video — batch-processing dozens of videos locally on Mac or Windows.

Try GeekLink Free