# Video Quality Adjust Adjust video quality using CRF (Constant Rate Factor) and encoding presets, from lossless to highly compressed > Canonical page: https://elysiatools.com/en/tools/video-quality-adjust - **Category:** Media - **Keywords:** video, quality, crf, adjust, enhance, optimize, compression ## Overview The Video Quality Adjust tool allows you to optimize and compress video files by adjusting the Constant Rate Factor (CRF), encoding speed presets, and resolution scaling. You can choose from predefined quality levels or customize settings like content tuning and output formats to balance file size and visual fidelity. ## Inputs - **Video File** (file): Select the video file to adjust quality - **Quality Preset** (select) - **Custom CRF Value** (number): CRF value (18 = high quality, 23 = default, 28 = compact) - **Encoding Speed Preset** (select) - **Content Type Tune** (select) - **Resolution Scale (%)** (range): Scale down resolution to reduce file size (100% = original) - **Output Format** (select) ## When to use - When you need to reduce video file sizes for faster web uploads or email sharing without sacrificing noticeable visual quality. - When you want to optimize video playback performance by scaling down the resolution and applying specific content tuning like animation or zero-latency streaming. - When you need to convert video formats while fine-tuning the compression ratio using custom CRF values and encoding speed presets. ## How it works - Upload your video file in any supported video format. - Select a quality preset or configure custom CRF values, encoding speeds, content tuning, and resolution scaling. - Choose your desired output format, such as MP4, WebM, MKV, AVI, or MOV. - Process the video to apply the compression and download the optimized file. ## Use cases - Compressing large raw video files into compact MP4s for social media uploads. - Optimizing animated videos using the animation tuning preset to preserve clean lines and flat colors. - Downscaling 4K or 1080p footage to 50% resolution to save storage space on local drives. ## Frequently asked questions ### What is CRF? Constant Rate Factor (CRF) is an encoding mode that adjusts the data rate dynamically to maintain a consistent visual quality level throughout the video. ### How does the encoding speed preset affect the output? Slower presets like 'veryslow' provide the best compression and smallest file sizes but take longer to process, while faster presets encode quickly but result in larger files. ### What output formats are supported? You can export your adjusted videos to MP4, WebM, MKV, AVI, or MOV formats. ### Can I resize the video resolution? Yes, you can use the Resolution Scale slider to scale down the video resolution from 100% down to 10% of its original size. ### What does the Content Type Tune option do? It optimizes the encoder settings for specific video types, such as animation, film grain, or low-latency streaming. ## Related tools - [Convert GIF to WebM](https://elysiatools.com/en/tools/gif-to-webm): Convert GIF images to WebM video format with modern compression and web optimization - [Convert MP4 to GIF](https://elysiatools.com/en/tools/mp4-to-gif): Convert MP4 videos to GIF format with 30-second limit and customizable quality settings - [Video to GIF Optimized](https://elysiatools.com/en/tools/video-to-gif-optimized): Convert videos to optimized GIF format with advanced compression settings - [Convert GIF to MP4](https://elysiatools.com/en/tools/gif-to-mp4): Convert GIF images to MP4 video format with customizable quality and resolution settings - [Video Audio Extract Enhanced](https://elysiatools.com/en/tools/video-audio-extract-enhanced): Extract audio from video files with advanced options - multiple formats, quality settings, and audio enhancement - [Batch Video Compressor](https://elysiatools.com/en/tools/video-batch-compress): Compress multiple video files by reducing file size while maintaining quality using CRF, resolution scaling, and codec optimization - [Video Bitrate Changer](https://elysiatools.com/en/tools/video-bitrate-changer): Change video and audio bitrate with preset values or custom settings, supporting both CBR and VBR modes - [Video Compressor](https://elysiatools.com/en/tools/video-compressor): Compress video files by reducing file size while maintaining quality using CRF, resolution scaling, and codec optimization ## Samples - [Video Samples](https://elysiatools.com/en/samples/video-samples): Sample video files in different formats and orientations - [Video AV1 Samples](https://elysiatools.com/en/samples/video-av1-samples): Sample video files encoded in AV1 format - [Video H.264 Samples](https://elysiatools.com/en/samples/video-h264-samples): Sample video files encoded in H.264 (AVC) format - [Video H.265 Samples](https://elysiatools.com/en/samples/video-h265-samples): Sample video files encoded in H.265 (HEVC) format ## Related content - [Video Container Conversion with Deliberate Transcode Control](https://elysiatools.com/en/hubs/video-container-conversion-and-transcode-control): Convert footage between MP4, AVI, FLV, MKV, MOV, and WebM containers, keep CRF and bitrate decisions under control during the re-encode, and batch a whole library under one recorded configuration.