Free online file tools

Every tool runs locally in your browser.

• EPUB ValidatorChecks EPUB structure — ZIP layout, container, OPF manifest, and file references. Runs in your browser.
• LRC to SRT / VTT ConverterConverts LRC lyrics with timestamps into subtitle files. Runs in your browser.
• LRC Offset EditorShift all timestamps in an LRC file or edit individual lines. Runs in your browser.
• Subtitle CheckerChecks SRT and VTT files for timing errors, overlaps, and reading speed. Runs in your browser.
• Subtitle CPS CheckerMeasures reading speed (characters per second) for every cue in SRT and VTT files. Runs in your browser.
• Subtitle FPS ConverterRescales SRT and VTT timecodes between frame rates like 23.976 and 25, with an optional offset. Runs in your browser.
• Subtitle Overlap FixerFinds overlapping cues in SRT and VTT files and fixes them the way you choose. Runs in your browser.