Multiple Conversion Formats
Convert audio files such as M4A, MP3, and WAV; video files such as MP4, WEBM, and MOV; and images such as JPG, PNG, and WEBP into formats suited to your needs.
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Frequently used categories are listed first, with concise card descriptions.
Web Tool CategoriesRanked by actual successful usage in the last 90 days
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Merge, Split and Adjust Speed
12ToolsEasy for BeginnersFile Selection Type
Shift Subtitle Timing
Shift SRT and VTT subtitle timestamps. Negative values move subtitles earlier; positive values delay them.
VideoMerge, Split and Adjust Speed
Easy for BeginnersFile Selection Type
Subtitle Translation & Dual Subtitles
Translate between Korean and English locally and save the translation alongside the original text.
VideoMerge, Split and Adjust Speed
Easy for BeginnersFile Selection Type
Video and Audio Fades
Apply synchronized video and audio fades at the beginning and end.
VideoMerge, Split and Adjust Speed
Easy for BeginnersFile Selection Type
Photo Slideshow
Select multiple photos and optionally one music track to create a 16:9 video. Photos play in the order selected.
VideoMerge, Split and Adjust Speed
Easy for BeginnersFile Selection Type
Video Transition Effects
Overlays and combines two videos in the selected order. Supports different formats and videos without audio.
VideoMerge, Split and Adjust Speed
Easy for BeginnersFile Selection Type
Adjust Video and Audio Synchronization
Positive values delay the audio, while negative values move it earlier. The video duration remains unchanged.
VideoMerge, Split and Adjust Speed
Easy for BeginnersFile Selection Type
Loop Video
Loop the video and audio together the specified number of times.
VideoMerge, Split and Adjust Speed
Easy for BeginnersFile Selection Type
Reverse Video
Reverse both the video and audio of a clip up to 120 seconds long.
VideoMerge, Split and Adjust Speed
Easy for BeginnersFile Selection Type
Add Audio to Video
Select a video first, then an audio file. Choose to replace or mix the audio, or lower the music volume when speech is detected.
VideoMerge, Split and Adjust Speed
Easy for BeginnersFile Selection Type
Split Video at Regular Intervals
Split a video into segments of the specified duration in seconds and save them as a ZIP.
VideoMerge, Split and Adjust Speed
Easy for BeginnersFile Selection Type
Merge Videos
Standardizes videos with different codecs, resolutions, or no audio, then merges them in the selected order.
VideoMerge, Split and Adjust Speed
Easy for BeginnersFile Selection Type
Change Video Speed
Adjust video playback and audio speed together from 0.25x to 4x.
VideoMerge, Split and Adjust Speed
Everything from file conversion to calculations and diagnostics in one place
REGOLITH is more than a collection of links. It provides functional web tools that take you from entering data and running tasks to reviewing and saving results. Original files remain unchanged, with results created separately. Each tool page explains supported formats, usage steps, and how to review results before you begin.
Getting Started Guide
Instructions for selecting files, configuring options, running tools, and saving results are available on a separate guide page and within each tool.
Detailed Task Descriptions
Provides format characteristics, recommended uses, guidelines for verifying calculation results, and precautions for handling sensitive files.