Open the toolkit
The toolkit

11 small tools. One stubborn rule: no upload.

7 video tools and 4 image tools, each doing one job on your device. Choose by the problem you have, not by the format list.

Video · 7 tools

Cut, shrink, and convert footage

Compress video

Hit a target file size without wrecking the picture.

Open tool Crop & resize

Make a clean 9:16, 1:1, or 4:5 cut for any feed.

Open tool Trim video

Cut the dead air at the start and end.

Open tool Convert video

MP4, WebM, GIF, or audio — one clean export.

Open tool Extract audio

Pull the sound out as MP3, WAV, or M4A.

Open tool Save a frame

Grab a clean still for a thumbnail or cover.

Open tool Convert subtitles

SRT to VTT, VTT to SRT, or shift the timing.

Open tool Not sure where to start?

Tell us the problem and the directory will point to the right tool.

Choose by problem
Choose by problem

What are you trying to fix?

An app says the video is too largeCompress to a target size.The video is horizontal but the feed is verticalCrop to 9:16 or 4:5.The good part starts 20 seconds inCut the start and end.The platform will not accept the video formatExport MP4, WebM, or GIF.You only want the soundExtract MP3, M4A, or WAV.You need a cover imageSave a still at any timestamp.The captions are in the wrong formatConvert SRT to VTT or back.A photo is too large to uploadHit a target size like 200 KB.The photo does not fit the feedCrop or pad to a platform preset.An image is in the wrong formatConvert JPG, PNG, and WebP.Windows will not open an iPhone photoTurn HEIC into a standard JPG.
Before you start

Four honest limits

Very large files can fail.

Browser work is limited by tab memory. A 500 MB video is usually fine on a desktop with 8 GB of RAM; a phone should stay under 200 MB. Images above 16.7 megapixels are capped for canvas safety. If a job fails, try a smaller file or a lower resolution.

The first video run downloads a 32 MB encoder.

The WebAssembly video encoder is fetched once and cached by your browser. After that, jobs start quickly. It is a one-time cost, not a per-video upload.

HEIC files may download a separate 3 MB decoder.

Safari uses the system HEIC decoder. Chrome, Edge, and Firefox load an open-source libheif decoder only when a HEIC file is selected. It runs locally in the tab and is cached for later visits.

We cannot download from YouTube or Instagram.

Cutmoor only works with files you already have. It does not fetch a URL, bypass a platform player, or download third-party content. Use the platform's own export for your own uploads.