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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Video
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Easy for BeginnersFile Selection Type
All-in-One Video Format and Audio Converter
Convert videos to MP4, WEBM, MOV, MKV, AVI, M4V, MPG, OGV, or GIF, or extract audio only in MP3, WAV, or M4A format.
VideoFormat & Audio
Easy for BeginnersFile Selection Type
Reduce Video File Size
Reduce video file size for easier sharing.
VideoCrop & Compress
Easy for BeginnersFile Selection Type
Trim Video
Trim and save only the required segment of a video.
VideoCrop & Compress
Easy for BeginnersFile Selection Type
Extract MP3 from Video
Save only the audio from the video as an MP3 file.
VideoFormat & Audio
Easy for BeginnersFile Selection Type
MP4 to GIF
Convert a short video into an animated GIF.
VideoFormat & Audio
Easy for BeginnersFile Selection Type
Edit Multiple Video Segments
Enter multiple time ranges in seconds or hours:minutes:seconds to keep or remove them. Example: 0-3, 5-8
VideoCrop & Compress
Easy 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 Color Correction
Adjust brightness, contrast, saturation, and color warmth.
VideoAspect Ratio & Layout
Easy for BeginnersFile Selection Type
Mosaic or Blur Video Regions
Conceals the specified screen area for the selected duration. Leave the end time blank to apply it until the end.
VideoAspect Ratio & Layout
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
Automatic Scene Detection & Splitting
Splits the video at points with significant visual changes and saves the segments as a ZIP file. Lower thresholds produce more segments.
VideoCrop & Compress
Easy for BeginnersFile Selection Type
Chroma Key Background Compositing
Select a new background image or video after the green-screen video.
VideoAspect Ratio & Layout
Easy for BeginnersFile Selection Type
Video Scene Contact Sheet
Saves frames sampled at regular intervals throughout the video as a single JPG image with timestamps.
VideoAspect Ratio & Layout
Easy for BeginnersFile Selection Type
Change Video FPS
Change the frame rate while preserving the video duration.
VideoTarget File Size
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
Crop Video
Crop a rectangular region from a video and save it as MP4.
VideoAspect Ratio & Layout
Easy for BeginnersFile Selection Type
Change Video Resolution
Change the horizontal resolution while preserving the original aspect ratio.
VideoAspect Ratio & Layout
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
Adjust Video Volume
Adjust the volume of the video's audio track.
VideoCrop & Compress
Easy for BeginnersFile Selection Type
Remove Video Audio
Save as an MP4 with the audio track removed.
VideoCrop & Compress
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
Add Images or Logos to Video
Select a video, then an image, and overlay the image at the specified position.
VideoAspect Ratio & Layout
Easy for BeginnersFile Selection Type
Add Text to Video
Display Korean text at the bottom center of the video.
VideoAspect Ratio & Layout
Easy for BeginnersFile Selection Type
Remove Logo Areas from Videos
Fills the selected rectangle by interpolating surrounding pixels. Traces may remain on complex backgrounds.
VideoAspect Ratio & Layout
Easy for BeginnersFile Selection Type
Reduce Video Shake
Reduce video shake by correcting small movements between frames.
VideoAspect Ratio & Layout
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 Aspect Ratio
Fit the video into a 16:9, 9:16, or 1:1 canvas.
VideoAspect Ratio & Layout
Easy for BeginnersFile Selection Type
Rotate Video
Rotate the video 90 degrees clockwise.
VideoAspect Ratio & Layout
Easy for BeginnersFile Selection Type
Flip Video Horizontally or Vertically
Flip a video horizontally or vertically.
VideoAspect Ratio & Layout
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
Easy for BeginnersFile Selection Type
Compress Video to Target File Size
Analyze video duration and compress the video using a bitrate calculated to approach the target file size in MB.
VideoTarget File Size
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.