Subtitle Tools

Free Online Subtitle Extract Packaging Tool

Free online subtitle tool for converting between SRT/VTT/ASS, adjusting timelines with offset and speed, and converting between UTF-8 and GBK encodings. Everything runs locally in your browser without uploading subtitle files.

Parsed 0

Input

Format Encoding

Timeline Adjustment

Offset (milliseconds, can be negative) Speed Rate (>0)

Timeline Adjustment：输出时间 = 输入时间 × 速度倍率 + 偏移；最终会裁剪到 ≥0。

Output

Format Encoding

Tip: This tool runs purely in your browser and supports UTF-8/GBK subtitle encoding and SRT/VTT/ASS format conversion (style preservation is fully accurate only for ASS→ASS).

Video Compressor

Compress local videos to MP4 (H.264) with resolution, CRF and audio bitrate controls, all processed locally in your browser.

Video Format Converter

Convert local videos between MP4/WebM/MKV/MOV/AVI with configurable scaling, FPS, CRF and audio bitrate, all processed locally in your browser.

Video Player

Play local video files in your browser with speed, volume, loop and picture-in-picture controls, all processed locally with no uploads.

Video to GIF Converter

Convert local video segments to GIF with adjustable FPS and width, processed fully in the browser with no uploads.

Video Trimmer

Trim local videos by start and end time and export the selected part as a WebM clip, processed fully in the browser.

Scientific Calculator

Perform everyday calculations and basic scientific functions directly in your browser with keyboard support and no data uploads.