Free Creator Tools

Free creator tools.
Built for short-form.

Everything you need to prep, convert, and optimise short-form video — running entirely in your browser. Your files never leave your device.

Subtitle Converter

Paste or upload any subtitle file and convert it to SRT, WebVTT, plain text, or ASS/SSA in seconds. All processing happens in your browser — your captions never leave your device.

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Aspect Ratio Calculator

Enter your source dimensions and see exactly how to crop or resize for every major platform. Visual crop preview shows which pixels get cut — no guesswork.

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Bitrate Calculator

Choose resolution, codec (H.264, H.265, VP9, AV1), and duration to get the recommended video bitrate and estimated file size — plus an instant check against TikTok, Reels, Discord, and other upload limits.

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Script to Duration

Paste your script and see how long it will run at slow, default, or energetic speaking paces. Per-platform indicators show whether you are in the peak engagement window for TikTok, Reels, or Shorts.

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Safe Zone Previewer

Upload a thumbnail or video frame and overlay the exact UI masks for TikTok, Instagram Reels, and YouTube Shorts. Verify nothing important hides under the action rail, caption bar, or profile picture.

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Platform Spec Sheet

Resolution, aspect ratio, safe zones, frame rates, caption limits, upload sizes, and hashtag caps for TikTok, Instagram Reels, and YouTube Shorts — all in one searchable grid.

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Video File Size Estimator

Enter clip duration, resolution, and codec (H.264, H.265, VP9, AV1) to get an estimated file size in MB or GB — plus instant verdict on whether it fits TikTok, Reels, and Shorts upload limits.

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Frame Rate Calculator

Set source fps, target fps, and clip duration to see the output duration, slow-motion factor, and total frame count. Includes an interpolation warning when upconverting.

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Timestamp Converter

Edit any of the three fields — timestamp, seconds, or frame number — and the other two update live at your chosen fps. Useful for NLE editing, subtitle timing, and thumbnail frame selection.

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Narration WPM Calculator

Two-mode calculator: convert word count to spoken duration, or find the maximum word count that fits a target duration. Per-context sweet-spot guide for TikTok, podcast, news, and audiobooks.

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Caption Character Counter

Type your caption and see instantly whether it fits TikTok (4,000), Reels (2,200), YouTube Shorts (100), YouTube Long (5,000), and X/Twitter (280). URLs counted as 23 characters for X.

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Hashtag Counter

Paste any hashtag string and get instant per-platform limit checks: Instagram (30 hashtags), TikTok (~100-character budget), YouTube Shorts (15 hashtags). Duplicate detection and cleaned-list copy included.

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Hook Library

Battle-tested hook templates across 14 psychology-backed categories — shock, curiosity gap, authority, confession, FOMO, and more. Browse, copy, and paste directly into your video scripts.

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YouTube Thumbnail Downloader

Paste any YouTube URL — including Shorts and embeds — and instantly download the thumbnail in every available resolution: maxresdefault (1280×720), hqdefault (480×360), mqdefault (320×180), and sddefault (640×480). 100% client-side, no upload needed.

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TikTok Thumbnail Downloader

Paste any public TikTok video URL to instantly preview and download the cover thumbnail. Uses the official TikTok oEmbed API — no third-party scraping, no watermarks.

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Vimeo Thumbnail Downloader

Enter a Vimeo video URL to download the highest-resolution thumbnail available. Uses the official Vimeo oEmbed API for reliable results on any public video.

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Instagram Reels Thumbnail Downloader

Paste any public Instagram Reel URL to extract and download the cover image. Note: Instagram occasionally restricts scraper access — if a download fails, try refreshing or use the Reel share menu.

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Video Compressor

Upload a video and drag the quality slider to dial in the right balance between file size and visual fidelity. Processed server-side with FFmpeg H.264 encoding — up to 500 MB input.

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Video to MP3

Drop a video file and get back a clean 192 kbps MP3 in seconds. Works with MP4, WebM, MOV, and AVI. Processing happens server-side with FFmpeg — up to 500 MB input.

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Mute Video

Remove the audio track from any video without re-encoding the video stream. Near-instant processing via FFmpeg stream copy — the full video quality is preserved. Up to 500 MB input.

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Audio Loudness Normalizer

Upload a video or audio file and get back a loudness-normalized version at -16 LUFS (EBU R128 standard). Ideal for podcast mastering, voiceover, and platform upload targets. Up to 500 MB input.

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Crop Video

Upload a video, draw an interactive crop rectangle over the preview, and download the cropped clip. Uses FFmpeg crop filter server-side — no quality loss from re-compression beyond the crop step. Up to 500 MB input.

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Subtitle Timing Shifter

Upload an SRT or VTT file and shift every cue timestamp by a precise offset — any number of seconds, positive or negative. Instant preview, browser-only processing, one-click download.

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Subtitle Merger

Upload two SRT or VTT files and merge them into one. File B timestamps are automatically shifted to follow the end of file A with a configurable gap — no manual timestamp editing required.

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Subtitle Splitter

Upload an SRT or VTT file and split it at a timestamp boundary or by maximum cue count. Each part downloads as a separate file inside a single ZIP — no timing knowledge required.

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SRT ↔ JSON Converter

Paste an SRT or VTT file to get a clean JSON array of {start, end, text} objects — perfect for feeding into AI pipelines. Works in reverse too: paste JSON to get a valid SRT file.

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Extract First Frame

Upload an MP4, WebM, or MOV file and download the very first frame as a full-resolution JPEG. Useful for generating thumbnails, verifying camera angle, or grabbing title cards. FFmpeg-powered, up to 500 MB input.

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Extract Last Frame

Upload a video file and download its last frame as a JPEG. Great for end-cards, freeze-frame thumbnails, or before/after comparisons. Server-side FFmpeg processing, up to 500 MB input.

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Extract Frame at Time

Enter a timestamp (HH:MM:SS or HH:MM:SS.ms) and download the exact frame from your video as a JPEG. Perfect for picking a cover image, fact-checking a specific moment, or creating still assets from footage.

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Video Trimmer

Set start and end timestamps to trim your video to the exact segment you need. Stream-copy mode preserves original quality for compatible cuts — no re-encoding unless required. Up to 500 MB input.

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Rotate / Flip Video

Fix portrait-to-landscape orientation or mirror your footage with five transform modes: 90° clockwise, 90° counter-clockwise, 180°, horizontal flip, and vertical flip. FFmpeg filter, up to 500 MB input.

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Reverse Video

Upload a video and get a reversed version in seconds. Processed server-side with FFmpeg — audio is reversed too. Supports MP4, WebM, and MOV up to 200 MB.

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Video Speed Changer

Upload a video and set a playback speed multiplier from 0.25× (slow motion) to 4× (fast forward). Audio pitch is preserved via FFmpeg atempo filter. Supports MP4, WebM, and MOV — up to 500 MB.

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GIF to MP4

Upload a GIF and download a compressed MP4 that loops perfectly and is a fraction of the file size. Uses FFmpeg palette optimisation — ideal for embedding GIFs on the web without the file-size penalty.

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MP4 to GIF

Upload a video and choose the frame rate (5–30 fps) and output width (240–1080 px) to generate a dithered animated GIF. Powered by FFmpeg palettegen — output quality beats most converters. Up to 500 MB input.

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Audio Converter

Upload any audio or video file and convert it to MP3, WAV, M4A, or OGG. Video files have their audio track extracted automatically. Processed server-side with FFmpeg — up to 500 MB input.

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Free to use

Every tool, every output

Built for short-form

TikTok, Reels, Shorts native

One click to full video generation

Ready to create the actual video?

Lumigen generates publish-ready TikToks, Reels, and Shorts from your script, images, or AI avatar.

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Free creator tools.Built for short-form.

Subtitle Converter

Aspect Ratio Calculator

Bitrate Calculator

Script to Duration

Safe Zone Previewer

Platform Spec Sheet

Video File Size Estimator

Frame Rate Calculator

Timestamp Converter

Narration WPM Calculator

Caption Character Counter

Hashtag Counter

Hook Library

YouTube Thumbnail Downloader

TikTok Thumbnail Downloader

Vimeo Thumbnail Downloader

Instagram Reels Thumbnail Downloader

Video Compressor

Video to MP3

Mute Video

Audio Loudness Normalizer

Crop Video

Subtitle Timing Shifter

Subtitle Merger

Subtitle Splitter

SRT ↔ JSON Converter

Extract First Frame

Extract Last Frame

Extract Frame at Time

Video Trimmer

Rotate / Flip Video

Reverse Video

Video Speed Changer

GIF to MP4

MP4 to GIF

Audio Converter

Ready to create the actual video?

Free creator tools.
Built for short-form.