UD5 Toolkit
WebVTT to SRT Converter - Online Subtitle Format Swap
Convert WebVTT subtitle files to SRT and vice versa. Handles formatting conversion and encoding. No upload, pure client-side parsing.
Video Subtitle Burner - Online Hardcode SRT into Video
Choose Video File
MP4, WebM, MOV, AVIChoose SRT File
.srt subtitle fileFrequently Asked Questions
Hardcoding (or burning) subtitles permanently embeds them into the video stream. Unlike soft subtitles (separate track), hardcoded subs cannot be turned off and are visible on any player or device.
Our tool runs entirely in your browser – no upload to servers, no installation. It's fast, private, and works on any modern device (Windows, Mac, iOS, Android).
Currently we support SRT (SubRip) files. Make sure your file uses standard timecodes like
00:00:10,500 --> 00:00:15,000.Yes! Use the style panel to change font family, size, text color, background color with opacity, and vertical position (top/middle/bottom with custom margins).
It depends on video length and your device's performance. The tool renders each frame with subtitles in real-time. A 1‑minute HD video may take 1–3 minutes. Shorter videos are faster.
No – everything stays on your device. Processing uses your browser's engine (WebCodecs/Canvas + MediaRecorder). No data is sent to external servers.
Subtitle File Converter - Online SRT ↔ VTT & Timestamp Shift
Convert subtitle files between SRT and WebVTT formats. Also shift all timestamps forward/backward. Works locally.
Online SRT Subtitle Shifter - Adjust Timing & Sync
Load an SRT file and shift all timestamps forward or backward by milliseconds or seconds. Fix out-of-sync subtitles instantly. Download corrected file.
Video Still Frame to GIF – Online Snap & Animate
Extract a few seconds from a video and convert to a short looping GIF. Use browser video decoder.
Video to GIF Converter - Online Local Extract Animated Clip
Convert a short video clip to GIF directly in the browser. Trim, resize, and adjust frame rate. No upload required, uses built‑in video decoder. Perfect for memes.
Video Audio Merger/Separator - Online Replace or Remove Soundtrack
Remove the original audio from a video and attach a new soundtrack. Or extract audio. All processed locally.
Online Video Reverser - Play & Save Backwards
Reverse any short video clip and download the backward version. Fun for creative effects. Browser‑based.
Online Video Resizer - Crop & Scale Locally
Resize a video by cropping to a new aspect ratio or scaling up/down. Apply and download the result. Browser‑based.
Webcam Recorder - Online Capture Video & Save
Use your webcam to record a video clip and download it as WebM. Adjust resolution. Works offline. Privacy‑friendly.
Video Speed Controller - Online Slow Motion & Timelapse
Play any video at 0.25x to 4x speed. Save the modified speed as a new file. Perfect for analysis or fun.
WebVTT Subtitle Validator - Online Check Syntax
Paste a WebVTT file and instantly check for syntax errors. Validate timestamps and cue formatting. Essential for video devs.
Video to MP3 Extractor - Online Save Audio from Video
Extract the audio track from any video and save as MP3 or WAV. No re‑encoding; fast demux. Client‑side only.
Audio/Video Sync Tester - Online Lip Sync Check
Load a video and visually check if audio aligns with lips. Use frame‑by‑frame stepping. Debug playback issues.
Online Video Trimmer - Cut & Save Clips Locally
Set start and end times for a video and trim it without re-encoding. Download the clip. Pure browser.
Online Video Format Converter - MP4, WebM, AVI in Browser
Convert video files between common formats using FFmpeg WASM. No upload required; all processing stays in your browser.
Video Keyframe Extractor - Online Capture I‑Frames
Seek through a video and extract only keyframes as JPEGs. Perfect for generating thumbnails. Canvas‑based.
High Quality Video to GIF - Online Optimized Converter
Convert short video clips to GIFs with adjustable resolution, frame rate, and dithering. Preview before download. All local.
Webcam Recorder - Online Capture Video & Save
Use your webcam to record a video clip and download it as WebM. Adjust resolution and see a preview. Works offline.
Video Metadata Viewer - Online Check Codec, Bitrate & Size
Drop a video file and instantly see its container format, codec(s), resolution, duration, and bitrate. Browser‑based, no upload.
Picture‑in‑Picture Tester - Online Float Video Anywhere
Open a test video in Picture‑in‑Picture mode. Control entering and leaving PiP. Copy the code snippet for your own app.
Photo Montage (Ken Burns) - Online Animated Effect
Create a slow, zooming and panning photo montage (Ken Burns effect) from your images. Export as WebM video. Canvas.
Video to Audio Extractor - Online Save MP3 from MP4
Extract the audio track from any video file and download it as MP3 or WAV. Works offline; no server upload.
SRT Subtitle Creator - Online Add Timestamps
Create .srt subtitle files manually by adding lines and setting times with a simple player. Download the result. Local.
Video to Animated WebP - Online Free Converter
Select a short video and convert it to an animated WebP image for faster web loading. Adjust quality and size. Local only.
Video Multi‑Frame Grabber - Online Extract Still Strips
Take multiple evenly spaced screenshots from a video and combine them into a single filmstrip image. Local canvas.
Video Speed Controller - Online Slow Motion & Timelapse
Play any video at a custom rate (0.25x to 4x) without audio pitch change. Save the playback speed as a link. Local.
ASCII Video Player - Online Convert Webcam to Text Art Live
Turn your webcam feed into real‑time ASCII art. Adjust density and character set. Fun for streams and demos. No upload.
Video Color Filter - Online Apply Tint to Video in Browser
Apply real-time CSS filters or canvas effects to a video and download the processed output. Experiment with video post-processing locally.
Video Screenshot Grabber - Online Capture Frame from Video
Load a video file and grab any frame as a still image. Navigate frame by frame. Download the snapshot. All done on your device.
Video to GIF Converter - Online Create Animated Images
Trim a video clip and convert it into an animated GIF. Adjust frame rate and size. Processing stays on your computer for privacy.