Video Trimmer

What is a video trimmer?

A video trimmer is a tool that cuts a video down to just the part you want to keep. You set a start point and an end point, and everything outside that window is removed, leaving a shorter clip. It is the single most common video-editing task there is: shortening a recording to its best moment, removing a slow intro or a fumbled ending, slicing a long capture into shareable pieces, or grabbing a precise highlight to post. This tool does all of that — and a good deal more — entirely inside your web browser, with no upload, no account and no cost.

What sets this trimmer apart is that it runs the real FFmpeg video engine compiled to WebAssembly (FFmpeg.wasm) directly on your device. When you export, your video is decoded, cut and written back on your own machine and never travels to a server. That single design choice has big consequences: your footage stays completely private, the tool is free, there is no waiting to upload or download the source file, and it even keeps working offline once the page has loaded. These are genuine cuts producing real MP4, MOV, WebM, MKV and AVI files — not screenshots or fake previews.

The trimmer is built to be both beginner-friendly and genuinely precise. You can trim the easy way — drag two handles on a thumbnail timeline and download — or work to the exact frame using timecode and frame-number inputs, frame-step buttons and keyboard nudging. It goes beyond a simple start/end cut, too: split a clip at the playhead, keep several separate segments, remove a section from the middle, invert your selection, reorder pieces, and export them either joined into one video or as individual files. A full preview player, social export presets, crop/rotate/flip, audio control and batch processing round out a tool that comfortably matches what paid desktop and online editors offer for cutting video.

Crucially, trimming here can be completely lossless. When you are only cutting — not changing the codec, resolution or anything else — the tool stream-copies the original video instead of re-encoding it, so the result is byte-for-byte the same quality as the source and the cut is almost instant. When you do want to change something (an exact frame cut, a new resolution, a vertical crop for Reels, a different format), it re-encodes with the real FFmpeg pipeline and clear quality controls. You always know which path you are on: the tool shows a “Lossless” or “Re-encode” badge before you export.

How to trim a video online

Trimming a video with this tool takes well under a minute. First, add your video: drag and drop it onto the upload area, click to browse your device, paste it straight from the clipboard with Ctrl+V, or import it from a direct URL. The file loads instantly because nothing is uploaded — it is read locally — and the tool reads its duration, resolution, frame rate and codecs so you have full context before you cut.

Next, set your in and out points. The fastest way is to drag the two rose handles on the thumbnail timeline until the selection covers the part you want; you can also click the timeline to move the playhead and watch the preview. For exact cuts, type timecodes in HH:MM:SS.mmm form or enter frame numbers directly, and use the frame-step buttons (or the ← and → keys) to nudge a boundary one frame at a time. The selection’s duration, frame count and percentage of the clip update live as you adjust.

If you need more than a single cut, this is where the trimmer shines. Press Split (or S) to cut the clip at the playhead into two segments; add as many keep-segments as you like; select an unwanted stretch and press “Remove middle” to drop it and join what remains; or invert your selection to flip what is kept and removed. Reorder segments with the up/down controls, and decide whether to export them combined into one clip or, by toggling “Export each as its own file”, as separate downloads bundled in a ZIP.

Finally, choose your output and export. To keep things fast and lossless, leave the trim mode on Lossless and just press Export. To change anything else, pick a format, codec, resolution, frame rate and quality — or click a one-tap preset like YouTube, Shorts, TikTok or WhatsApp, which also crops to the right aspect ratio. Press Export (or Ctrl+E), watch the real-time progress, and your trimmed video downloads when it is done, audio intact. Because everything ran in your browser, there is nothing to clean up on any server.

How to trim videos without losing quality

Most online video cutters re-encode every video they touch, which always throws away a little quality and takes time proportional to the clip’s length and resolution. This trimmer avoids that whenever it can. If you are only cutting — keeping the original codec, resolution, frame rate and audio — it performs a lossless stream copy: FFmpeg copies the already-compressed video and audio packets straight into the new file without decoding and re-encoding them. The result is identical in quality to the source, and because no pixels are processed, it finishes almost instantly even on long, high-resolution videos.

There is one honest trade-off to understand. A lossless cut can only begin and end exactly on a keyframe — a self-contained reference frame that the video stores every few seconds. If your chosen start point falls between keyframes, a lossless cut snaps to the nearest one, so the clip may begin a fraction of a second earlier than you marked. For most trims this is invisible and completely acceptable. When you need the cut on an exact frame — for tight edits, music sync, or removing a single unwanted frame — switch to Precision or Frame-accurate mode, which re-encodes from the precise cut point.

Even when you do re-encode, you stay in control of quality. The tool exposes a clear quality setting (Original/near-lossless, High, Medium, Low) that maps to FFmpeg’s CRF, plus codec choice — H.264 for universal compatibility, H.265 or AV1 for smaller files at the same quality, VP9 for the web. Choosing “Original” quality and a modern codec gives you a frame-accurate cut that is visually indistinguishable from the source. So whether you want the instant, perfect-quality copy or the exact-frame precision cut, you can have it — and the tool tells you which one you are getting before you commit.

Supported video formats

The trimmer accepts a wide range of input containers so you rarely have to convert before cutting. You can load MP4, MOV, AVI, MKV, WEBM, FLV, WMV, M4V, MPEG/MPG, 3GP, OGV and TS (plus related streams like MTS and M2TS). Because the real FFmpeg engine handles decoding, even formats your browser cannot play natively — like AVI, MKV, FLV, WMV and TS — can still be trimmed; the timeline thumbnails may be unavailable for those, but every other control works, and the export is a real cut.

On the output side you can keep the source format or change it. Export to MP4 (the most universally compatible, H.264 + AAC), MOV for Apple and editing workflows, MKV as a flexible container, WebM (VP9 + Opus) for the web, M4V, or AVI for legacy compatibility. For a lossless trim, keep the same container and codec as the source so the streams can be copied directly. For a converted trim, the tool automatically pairs each container with a sensible codec — H.264 for MP4/MOV/MKV/AVI, VP9 for WebM — and lets you override it.

This breadth makes the trimmer a practical first stop for almost any video task: drop in whatever you have — a phone’s MOV, a screen recorder’s MKV, an old camera’s AVI, a download’s WEBM — cut it, and get back a clean file in the format you actually need. And since the engine is the same FFmpeg that professional tools rely on, format support is genuine rather than a thin wrapper around the browser’s limited built-in decoders.

Best video editing practices for trimming

A few habits make trimming faster and the results cleaner. Start by trimming before you transform: if you plan to also crop, resize or change format, set your in/out points first so the re-encode only processes the part you are keeping — it finishes faster and the file is smaller. Keep a copy of your original, too; trimming here never overwrites your source file, but having the untouched original means you can always re-cut differently later.

Choose the right cut mode for the job. For quick, faithful trims, stay lossless — it is instant and preserves quality perfectly. For edits that have to land on an exact frame, or whenever you are already changing the codec or resolution, use a precise re-encode and pick a quality that matches your purpose: Original or High when detail matters, Medium or Low when you need a small file for messaging or email. When you cut multiple segments that will be joined, the tool normalises them so they concatenate cleanly; if a join ever fails on an unusual source, switching to a re-encode mode resolves it by giving every piece a single shared codec.

Finally, match the export to where the video is going. Use a social preset to get the correct resolution and aspect ratio automatically, cap the resolution at 1080p (or 720p) for anything destined for upload to keep files manageable, and enable web fast-start for clips that will stream in a browser. Preview your selection with the player and loop the active segment to confirm the boundaries before exporting — a ten-second check beats re-rendering. Good trimming is mostly about deciding precisely what to keep; the tool’s frame-accurate controls and live preview are there to make that decision easy.

Trimming videos for social media

Every social platform has its own rules — length limits, preferred aspect ratios and resolution caps — and trimming is usually the first step to meeting them. A landscape recording becomes a vertical Short or Reel; a long stream becomes a sub-three-minute TikTok; a webinar becomes a one-minute LinkedIn teaser. This trimmer is built for exactly that workflow, pairing precise cutting with one-click export presets that handle the platform-specific details for you.

The built-in presets cover the platforms people actually use: YouTube and YouTube Shorts, TikTok, Instagram Reel and Feed, Facebook, WhatsApp, Telegram, LinkedIn, X (Twitter), Discord, generic website upload and email sharing. Each preset sets a sensible resolution, frame rate and codec, and — for the vertical and square formats — automatically centre-crops your footage to the right aspect ratio (9:16 for Shorts/TikTok/Reels, 1:1 for an Instagram feed post, 16:9 for YouTube and LinkedIn). You can still fine-tune anything afterwards, but the preset gets you 90% of the way in a single tap.

Because the most common social need is “cut this to the good 15 seconds and make it vertical,” the trimmer lets you do both at once: mark the segment, choose the Reel or Shorts preset, and export a correctly-framed, correctly-sized clip ready to upload. And since the WhatsApp, Telegram, Discord and email presets also compress sensibly, you can get a clip small enough to send directly through a chat app without a separate compression step. It is a complete social-clip pipeline that never uploads your footage to anyone.

Privacy & security

Video is among the most personal data people handle — it can contain faces, voices, locations, screens, documents and private moments — yet the usual way to trim a video online is to upload it to a stranger’s server. That means trusting an operator with your raw footage, accepting that it may be cached, logged or exposed in a breach, and waiting through uploads and downloads of large files. For anything private, that is a poor bargain.

This trimmer removes the bargain entirely. Because it runs FFmpeg.wasm on your own device, your video is read from your disk into your own browser, cut on your own CPU, and handed straight back to you as a download. Nothing about the video is transmitted — you can verify this in your browser’s network panel, and you can disconnect from the internet and keep working. Only coarse, non-identifying usage events (like “export used”) may be recorded; never your video, its frames, or its filename. Optional trim history saves just your segment settings locally, never the footage.

This privacy-first model matters most for the very clips people trim and share: family videos, footage with bystanders, screen recordings that show private information, confidential business material. The safest place for that video is the only place it needs to be — your own machine. Combined with HTTPS delivery of the tool itself and automatic disposal of your file when you close the tab, browser-based trimming turns “please trust us with your video” into “your video never leaves,” which is exactly the guarantee personal footage deserves.

Why use this online video trimmer?

Desktop editors are powerful but heavy: they cost money, take time to install and learn, and are overkill when all you want is to cut a clip. Most free online cutters, meanwhile, upload your video, add a watermark, cap the length or quality, and re-encode everything so you lose a little fidelity on even the simplest trim. This tool is designed to beat both: it is as quick and frictionless as the lightest web cutter, as private as an offline app, and as capable — for trimming, splitting and reframing — as far more complex software.

You get frame-accurate precision and instant lossless cuts, multi-segment editing, a real preview player and thumbnail timeline, social presets, crop/rotate/flip, full format and codec control, batch processing and keyboard shortcuts — with no sign-up, no watermark on your output, and no upload of your footage. It is fully responsive, so it works on a phone for a quick cut or a desktop for serious multi-segment work, and it is keyboard-navigable and screen-reader-labelled for accessibility.

Whether you are a creator preparing clips for five platforms, someone shortening a video to text to a friend, an educator chaptering a lecture, or an editor pulling selects from raw footage, this trimmer gives you a professional-grade, privacy-first cutting platform that is genuinely free and runs entirely in your browser. Add a video, make your cut, and download a real file in seconds.