Oříznout video online

What Oříznout video does

Cropping cuts away the edges of the picture and keeps a rectangle you choose. Oříznout video applies the FFmpeg crop filter to every frame and then re-encodes the video as H.264 MP4 with AAC sound, because the picture size cannot change without encoding again. Width and height are rounded to even numbers, which H.264 requires.

You set the crop area on a preview, either freely or locked to a ratio such as 1:1, 9:16 or 16:9. Common reasons are reframing a landscape video for a vertical feed or removing black bars at the edges.

Jak používat nástroj Oříznout video

1. Přetáhněte video do pole.
2. Pomocí náhledu nastavte možnosti nástroje „Oříznout video“.
3. Klikněte na Použít. Video se zpracuje ve vašem prohlížeči.
4. Stáhněte nové MP4.

When to use Oříznout video

• Turn a horizontal 16:9 clip into a 9:16 vertical video for Reels, TikTok or YouTube Shorts.
• Crop a video to 1:1 or 4:5 so it fills the frame in an Instagram feed post.
• Remove black bars, a taskbar or an unwanted area at the edge of a screen recording.
• Zoom in on the speaker in a wide conference recording so their face fills more of the frame.

Settings explained

Aspect ratio

Locks the crop box to a shape: 1:1 for square posts, 9:16 for vertical stories, 16:9 for YouTube, 4:5 for portrait feed posts, or 4:3. Free lets you drag any shape.

Crop area

The box drawn on the video preview. Drag inside it to move it and drag its corners to resize it. The darkened area outside the box is removed from every frame.

Video quality

Sets the H.264 quality used when the cropped video is encoded. The default, High, keeps nearly all of the remaining detail. Choose Medium or Low for a smaller file.

Format comparison

Co je MP4?

MP4 (MPEG-4 Part 14) je videoformát z roku 2001, jehož autorem je MPEG. Formát používá ztrátovou kompresi. Soubory mají příponu .mp4.

MP4 is a container format defined in part 14 of the MPEG-4 standard and based on Apple's QuickTime file format. It holds separate video, audio and subtitle tracks. The video is usually H.264 or H.265, sometimes AV1, and the audio is usually AAC. The codecs inside, not the container, decide the quality.

MP4 with H.264 video and AAC audio is the most compatible choice for sharing video. It works well for uploads to social media and video sites, playback on phones and TVs, and video embedded in websites.

Compatibility depends on the codecs inside. An MP4 with H.265 or AV1 video may not play on older devices or in every browser. H.264 and H.265 are patented codecs. Editing and saving again with a lossy codec reduces quality.

MP4 plays in all major web browsers, on Windows, macOS, Android and iOS, on smart TVs and game consoles, and in players such as VLC. H.264 MP4 is the safest choice when you do not know the device.

Co je MOV?

MOV (QuickTime Movie) je videoformát z roku 1991, jehož autorem je Apple. Formát používá ztrátovou kompresi. Soubory mají příponu .mov.

MOV is the QuickTime movie format created by Apple. It is a container with tracks for video, audio, timecode and text. The MP4 format was based on it, so the two are closely related. iPhones record MOV files, usually with H.264 or HEVC video, and professional workflows often use ProRes inside MOV.

MOV is a natural choice for video recorded on Apple devices and for editing in Final Cut Pro, iMovie and other professional tools. With codecs such as ProRes, it keeps high quality during editing and post-production.

MOV files with professional codecs are very large. Some Windows programs, Android devices, browsers and websites do not play MOV, especially when it contains HEVC or ProRes video. Converting to MP4 usually solves compatibility problems for sharing.

MOV plays natively on macOS and iOS in QuickTime Player and Photos. Windows can play many MOV files in its built-in apps or in VLC, depending on the codec. Safari plays MOV, while other browsers support it only partly.

Co je AVI?

AVI (Audio Video Interleave) je videoformát z roku 1992, jehož autorem je Microsoft. Formát používá ztrátovou kompresi. Soubory mají příponu .avi.

AVI is a container format introduced by Microsoft as part of Video for Windows. It is based on the RIFF file structure and stores audio and video data interleaved in chunks. It can hold many codecs, and in the 2000s it was often used with DivX or Xvid video and MP3 audio.

Today AVI is mainly useful for compatibility with older software, older hardware players and some industrial or scientific cameras. For most new videos, MP4 or MKV is a better choice.

AVI is an old format that handles modern codecs and features, such as variable frame rate and subtitles, poorly. Files are often larger than MP4 files at the same quality, and web browsers cannot play AVI.

Windows plays many AVI files in its built-in apps, depending on the codec. On macOS, Linux, Android and iOS, a player such as VLC is usually needed. Browsers cannot play AVI, although many video sites accept it as an upload.

Co je WEBM?

WEBM (WebM) je videoformát z roku 2010, jehož autorem je Google. Formát používá ztrátovou kompresi. Soubory mají příponu .webm.

WebM is an open, royalty-free video format started by Google for the web. It is based on the Matroska container and allows only a few codecs: VP8, VP9 or AV1 for video, and Vorbis or Opus for audio. This restriction makes playback in browsers predictable.

WebM is a good choice for video on websites, short clips with small file sizes, and screen recordings made in the browser. It can also store video with transparency, which an MP4 with H.264 video cannot.

Some older Apple devices, editing programs, TVs and phones cannot play WebM. Encoding VP9 or AV1 is slower than encoding H.264. Some social media sites and messaging apps convert or reject WebM uploads.

Chrome, Edge and Firefox play WebM on all platforms, and recent Safari versions support it on macOS and iOS. Android plays WebM natively. On Windows and macOS, VLC and most modern media players open it.

Proč používat nástroj Oříznout video od FansBond

Většina online převodníků nahrává vaše soubory na své servery. Nástroj „Oříznout video“ od FansBond místo toho pracuje přímo ve vašem prohlížeči díky WebAssembly a moderním rozhraním prohlížeče. Soubory zůstávají ve vašem zařízení, což je bezpečnější pro soukromé fotky, smlouvy i nezveřejněnou práci, a často je to i rychlejší, protože se nic nemusí nahrávat ani stahovat.

Žádné fronty, žádné vodoznaky a žádný účet. Jakmile se stránka načte, nástroj funguje i na pomalém připojení.

Tips for the best result

• The preview uses your browser's own video player. If a file such as AVI, WMV or FLV shows no preview, convert it to MP4 first, then crop it.
• Cropping does not add pixels. A 1080p landscape video cropped to 9:16 keeps only about 600 × 1080 pixels, which looks softer on large screens.
• The crop area stays in the same place for the whole video. Watch the clip first to check that the subject stays inside the box.
• To make a short vertical clip, shorten the video first with the trim tool. Encoding a shorter clip is much faster.

How Oříznout video works in your browser

Video and audio are processed with FFmpeg, the open-source media toolkit behind most video software, compiled to WebAssembly. Video is encoded with H.264 for MP4, MOV and MKV, VP8 for WebM, and audio with AAC, MP3, Vorbis, Opus or FLAC depending on the format.

WebAssembly FFmpeg runs on your device's processor without a server. It is slower than a native desktop app, so a long video can take a few minutes. Keep the tab open until the progress bar finishes.

Privacy and security

Most online converters upload your files to a server, process them there and keep a copy for some time. Oříznout video works differently: the code is downloaded to your browser once, and your files are read and written only on your device.

You can check this yourself: after the page has loaded, turn off your internet connection and the tool still works. This makes it safe for contracts, IDs, medical records, private photos and unreleased work.