TwoThink Video blog
Tutorials and techniques
WAV to MP3, MP3 to WAV: how to pick a format without regrets
Recording, editing, sharing over WeChat — should it be WAV or MP3? A rundown of the common audio formats and how to convert between them locally in the browser.
How to capture video frames locally — batch intervals and format advice
Introduces taking video screenshots with a browser video + Canvas, how to choose a batch interval, the PNG/JPG trade-off, and the features and limits of the TwoThink video screenshot tool.
How to trim a video clip precisely — intros, outros and export tips
Explains how to pick the start and end times when trimming a video locally in the browser, the common pitfalls (key frames, audio sync) and how to use the TwoThink video trimmer.
Video format conversion: MP4 or WebM? (locally in the browser)
A comparison of MP4 and WebM compatibility and file size, when a format conversion is worth it, and what to watch out for when transcoding locally with TwoThink.
The 10 best free video tools of 2026 (no ads)
Compress, trim, convert to GIF, extract audio, merge, convert formats, change speed, watermark, long images, vertical video — one browser tool per scenario, no sign-up and no uploads.
Changing video speed without changing the pitch? These 2 parameters matter
A tutorial that wants 1.5x, sports footage that wants slow motion, and the voice turns shrill or muffled after a speed change? setpts and atempo have to be paired.
Five ways to watermark a video — which looks cleanest?
Both self-media creators and brands need a watermark. Five approaches — text, logo, moving badge — and how to pick the opacity and position.
Turn a video into a long image for WeChat Moments? Three steps
WeChat video previews are small and slow to load. Sampling the frames into one long image gives a much nicer scrolling experience in Moments.
Posting landscape footage on TikTok? This is how to make it vertical without it going blurry
TikTok favours vertical video, but creators are holding a lot of landscape source. Blurred background fill is my default approach for keeping it sharp and uncropped.
Three ways to merge videos — which is the fastest?
Joining three clips into one vlog: same-format clips concat in seconds, mixed formats need a re-encode. Here are the three approaches and their pitfalls.
How do you keep a video-to-GIF conversion sharp? Measured in 2026
Stickers that turn into a blur? Two parameters — frame rate and palette — decide GIF sharpness. I ran several comparisons on the same clip.
How do you extract background music from a WeChat video? Three steps
Saw a soundtrack in a short video and want to keep it? No screen recording needed — extract the audio and turn it into an MP3, entirely in your browser.
Video too big to send? Four compression methods (online / software / mobile)
WeChat caps files at 100MB and email at 25MB — I have hit both. I tried four ways of compressing the same 98MB travel clip and the size and quality differences were large.
How do you turn a TikTok video into a vertical one? Three methods (free and no uploads)
Landscape footage posted to TikTok gets cropped or letterboxed. I compared the built-in crop, professional software and an online browser tool, and recommend a blurred background fill.